Multiple Left Joins Help?
Apr 27, 2004
Could somebody tell me what is the secret of being able to write a SELECT statement having mulitple LEFT or RIGHT joins, I seem to get in trouble as soon as I add the second LEFT join, as I am obviously doing it wrong.
These are my tables, would somebody mind having a go,or explaining what do i need to be aware of in a case like this
emailDetails table ( emailID_PK,emailName,emailText,emailSubject,emailN otificationTypeID)
emailRecipients table (emailID_PK, RecipientID, SentToEmail)
luEmailNotificationTypes look up table (emailNOtificationTypeID_PK, emailNotificationTypeName)
Thanks
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Sep 1, 2005
Hi All,
Im having a problem with a statement i cannot seem to get 2 left joins working at the same time 1 works fine but when i try the second join i get this error:-
Microsoft OLE DB Provider for ODBC Drivers error '80040e14'
[Microsoft][ODBC Microsoft Access Driver] Syntax error (missing operator) in query expression 'children_tutorial.school_id=schools.idx LEFT JOIN regions ON children_tutorial.region_id=region.idx'.
My SQL statment is as follows :-
SELECT children_tutorial.*,schools.schoolname,regions.rname FROM children_tutorial LEFT JOIN schools ON children_tutorial.school_id=schools.idx LEFT JOIN regions ON children_tutorial.region_id=region.idx
I am using an Access database i have tried all sorts to get it working and its driving me mad!! any help would be really appreciated.
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May 31, 2006
I need to do multiple left outer join to return search profiles that could contain NULL in them that could also be foreign keys. I bolded the three IDs that could be NULL or have a foreign key for a value. An example with my code would be great I've tried decyphering the many employee and company examples on the web but I haven't figured it out yet. Right now I only get profiles that have foreign key values and it misses the rest in the search. So NULL MakeID or ModelID no result on that item my SQL statement below. Using SQL Server 2005. Pretty new this to SQL and databases but so far this has been the only trying part.
Thanks
String dbsql = "SELECT a.EquipmentID " +
" , a.SerialNo " +
" , b.Category " +
" , c.Subcategory " +
" , d.Make " +
" , e.Model " +
" , f.Status " +
" FROM tblEquipInfo a " +
" , tblEquipCat b " +
" , tblEquipSubcat c " +
" , tblEquipMake d " +
" , tblEquipModel e " +
" , tblStatus f " +
" WHERE b.Category = '" + val + "' " +
" AND a.CategoryID = b.CategoryID " +
" AND a.SubcategoryID = c.SubcategoryID " +
" AND a.MakeID = d.MakeID " +
" AND a.ModelID = e.ModelID " +
" AND a.StatusID = f.StatusID";
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Mar 3, 2008
Hi, I am trying to write a query that gets the percentage of students in specific racial groups in specific schools. Some ethnicity values of students are null so I have to use left joins. My query is below, when I run it I get the error "join expression not supported", I've tried a couple different ways of doing it but I always get that error or "syntax error in from clause". Can anybody help me with formatting multiple and nested left joins in general?
Thanks in advance.
drop table percentMinorities;
create view percentMinorities as
select s1.schoolid,
round(count(s2.studentid)/count(s1.studentid),2) as percentWhite,
round(count(s3.studentid)/count(s1.studentid),2) as percentBlack,
round(count(s4.studentid)/count(s1.studentid),2) as percentHispanic,
round(count(s5.studentid)/count(s1.studentid),2) as percentAsian
from
students as s1 left join
(students as s2 left join
(students as s3 left join
(students as s4 left join students as s5
on s4.studentid is not null and s5.ethnicity = 'A')
on s3.studentid is not null and s4.ethnicity = 'H')
on s2.studentid is not null and s3.ethnicity = 'N')
on s1.studentid is not null and s1.ethnicity = 'O'
group by s1.schoolid
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Apr 25, 1999
To the wise,
This may be a very simple problem but it's been racking may brains for a while and I just can't seem to think it through clearly.
I'm trying to return a query which uses a left join and where. I'm hoping to get a result set which shows - let us says all the departments in a company. I would like to see all the department but only the names of department heads that earn 20.000+.
In MS Access I used a subquery. My subquery returned only departments with department heads that earned 20.000+ - I then left joined the departments table to that query - no problem.
With MSSQL I've tried IN, ANY, ALL but my result sets only returns the departments that earn 20.000+ and the employees for those particular departments.
I'm thinking there must be some way of doing this without having to use a union clause.
Thanks for taking the time to read this message through.
Sincerely,
Arthur Lambiris
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Nov 2, 2006
My understanding of relevant topics as well as SQL Books Online definition of left outer joins is that each record in the left table will be retrieved and where no associated right record exists then null values will be displayed for records in the right hand table but I've obviously misunderstood and would be grateful if someone could show me how to produce the required effect.
My scenario is pretty simple: 2 tables DiningTables and Reservations with columns as follows:
DiningTables: TBL_ID and TBL_Location - TBL_ID is the primary key
Reservationss::RES_TBL_ID and RES_Diner_Name - RES_TBL_ID is the primary key
There are 8 records in DiningTables and 4 records in Reservations and the objective is obtain the following output:
TBL_ID RES_Diner_Name
1 Jones
2 Smith
3 Bloggs
4 Mack
5 null
6 null
7 null
8 null
The SQL query I used is
SELECT Reservations.RES_Diner_Surname, DiningTables.TBL_ID
FROM DiningTables LEFT OUTER JOIN
Reservations ON DiningTables.TBL_ID = Reservations.RES_TBL_ID
That query generates 11 rows as follows:
TBL_ID RES_Diner_Name
1 Jones
1 Smith
1 Bloggs
1 Mack
2 null
3 null
4 null
5 null
6 null
7 null
8 null
I'm clealry missing something incredibly obvious and I kinda feel like the village idiot and would be extremely grateful for a clue!!
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Oct 25, 2007
Hi All,
This may be a stupid question. But I just want to make sure i'm going in right direction.
I wrote the following query. My purpose is to retrieve all the members who submitted loan applications.
I just want to make sure my query is right? Can anyone veryfy this query?
Do I have to use loanApplication table first instead of members. Also Do I need to use right outer joins instead of left outer joins?
Code Block
SELECT Member.CUMemberId, LoanApplication.SubmittedOn, Member.LastName, Member.FirstName, Member.MiddleName, LoanApplication.Amount,
LoanApplication.Decision, LoanApplication.Term, Rate.InterestRate, LoanApplication.Status, Member.CuStatus
FROM Member INNER JOIN
MemberLogon ON Member.Id = MemberLogon.MemberFK INNER JOIN
LoanApplication ON Member.LastLoanApplicationFK = LoanApplication.Id AND Member.Id = LoanApplication.MemberFK LEFT OUTER JOIN
Account ON Member.Id = Account.MemberFK AND LoanApplication.LoanFK = Account.Id LEFT OUTER JOIN
Rate ON LoanApplication.RateFK = Rate.Id
WHERE (LoanApplication.Status = 'Submitted')
Thanks
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Sep 21, 2007
Hello,
I am working on a query that has 11 left join statements, some are hitting against reference data that has a small amount of records, whereas others not so small. From a performance standpoint, should I look at rewriting this query, and how would I do so? What is an alternative to left joins; any examples anyone has?
Thanks.
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Feb 17, 2008
Hi,
First of all, is this an appropriate place to get answers related to SQL CE? If not, do you have any recomended forums elsewhere?
I'm trying to get a list of various related tables using ResultSets on SQLCE 3. The query is something like this:
SELECT A.*
, F.Descricao AS FamiliasDescricao
, M.Descricao AS MarcasDescricao
, I.Descricao AS IVADescricao
FROM Artigos AS A
LEFT OUTER JOIN Familias AS F ON A.FamiliasUID = F.UID
LEFT OUTER JOIN Marcas AS M ON A.MarcasUID = M.UID
LEFT OUTER JOIN IVA AS I ON A.IVAUID = I.UID
INNER JOIN ArtigosTipos AS AT ON A.ArtigosTiposUID = AT.UID;
The column ArtigosTiposUID cannot be NULL, so an INNER JOIN is used, but the other UID columns can have a NULL value, and I need all the rows on Artigos to show up even if these other UIDs are NULL. The query runs fine like this in VS2005, returning NULL values for the columns if there are no rows on the other tables, both on the SQL Server 2005 database and the .sdf database used on the Windows Mobile device. But on Windows Mobile SQL CE gives me an "Unspecified error [7]", Native error 25607, an the stack trace ends with:
em System.Data.SqlServerCe.SqlCeCommand.ProcessResult s()
em System.Data.SqlServerCe.SqlCeCommand.CompileQueryP lan()
em System.Data.SqlServerCe.SqlCeCommand.ExecuteComman d()
em System.Data.SqlServerCe.SqlCeCommand.ExecuteResult Set()
If I replace all the LEFT OUTER JOINs with INNER JOINs only the rows where all UIDs have a value show up, but as I said, I want all rows on tabela Artigos. Even if I remove all JOINs except the last one and replace it with a LEFT OUTER JOIN I get the same erro, all rows having the column ArtigosTiposUID defined... it seems as if the simple presence of LEFT OUTER JOIN makes SQL CE return an error.
Is there a way to run the queries on VS using the SQL CE engine so that one can check whether the query will run successfuly on Windows Mobile?
Any other sugestions?
Thank you,
Hugo Lopes
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Nov 13, 2003
Other than being much less readable, is there a downside to combining left and right outer joins in the same SELECT? I'm reviewing some generally poor code done by a contractor and it's peppered with queries with both left and right joins. I've always thought it was just a semantic difference, but I was just wondering if, other than readability, there were any performance issues.
Thanks,
Pete
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Jan 12, 2005
Hi,
I am working a DTS package and I need to Join to completely differnet tables in such a way that I need to do an inline view and an Outer Join. In this current form, it drops all columns for a day if one of the inline views returns null.
SELECT 01 as WHSE_ID
, A.On_Time
, B.Early
, C.Late
, (D.AVG_Duration / (A.On_Time + B.Early + C.Late))AS AVG_Duration
, E.DelDate
, F.*
FROM
(SELECT COUNT(SDD_Status) AS On_Time
, SDD_Date as On_Time_Date
FROM SDD_Store_Delivery_Data_Table
WHERE SDD_Route LIKE '01%' AND SDD_Status = 'On Time'
AND SDD_Date < '12/19/2004' AND SDD_Date > '12/10/2004'
GROUP BY SDD_Date) a,
(SELECT COUNT(SDD_Status) AS Early
,SDD_DATE As Early_Date
FROM SDD_Store_Delivery_Data_Table
WHERE SDD_Route LIKE '01%' AND SDD_Status = 'Early'
And SDD_Date < '12/19/2004' AND SDD_Date > '12/10/2004'
GROUP BY SDD_Date) b,
(SELECT COUNT(SDD_Status) AS Late
, SDD_Date As Late_Date
FROM SDD_Store_Delivery_Data_Table
WHERE SDD_Route LIKE '01%' AND SDD_Status = 'Late'
AND SDD_Date < '12/19/2004' AND SDD_Date > '12/10/2004'
GROUP BY SDD_Date) c,
(SELECT SUM(CAST(SDD_Stay AS NUMERIC)) AS AVG_Duration
, SDD_Date As Stay_Date
FROM SDD_Store_Delivery_Data_Table
WHERE SDD_Route LIKE '01%'
AND SDD_Date < '12/19/2004' AND SDD_Date > '12/10/2004'
GROUP BY SDD_Date) d,
(SELECT DISTINCT(SDD_Date) AS DelDate
FROM SDD_Store_Delivery_Data_Table
WHERE SDD_Date < '12/19/2004' AND SDD_Date > '12/10/2004'
GROUP BY SDD_Date)e,
(SELECT *
FROM WAREHOUSE_METRICS
WHERE MTRC_DTE < '12/19/2004' AND MTRC_DTE > '12/10/2004'
AND WHSE_ID = 2
GROUP BY MTRC_DTE
, MTRC_ID
, WHSE_ID
, INVN_LVL_CS_CNT
, INVN_LVL_DLLR
, INVN_LVL_PLLT_CNT
, RCV_CS_CNT
, SHP_CS_CNT
, SRVC_LVL_PCT
, SCRTCH_CNT
, DROP_CNT
, RPLNSH_CNT
, DMG_CNT
, RET_CNT
, PICK_CYC_CNT
, PICK_ERR_CNT
, RSV_CHK_CNT
, ERR_CNT
, DLY_CS_VRNC
, DLY_DLLR_VRNC
, CMB_THRUPUT
, DELAY_MINS_CNT
, DELAY_PCT
, UNLOAD_AVG
, LABOR_AVG
, SELECT_HR_CNT
, CRT_USERID
, CRT_DTE_TME
, UPD_USERID
, UPD_DTE_TME) f
WHERE a.On_Time_Date = E.DelDate
AND B.Early_Date = E.DelDate
AND C.Late_Date = E.DelDate
AND D.Stay_Date = E.DelDate
AND F.MTRC_DTE = E.DelDate
GROUP BY E.DelDate
, A.On_Time
, B.Early
, C.Late
, AVG_Duration
, A.On_Time_Date
, B.Early_Date
, C.Late_Date
, D.Stay_Date
, F.WHSE_ID
, F.INVN_LVL_CS_CNT
, F.INVN_LVL_DLLR
, F.INVN_LVL_PLLT_CNT
, F.RCV_CS_CNT
, F.SHP_CS_CNT
, F.SRVC_LVL_PCT
, F.SCRTCH_CNT
, F.DROP_CNT
, F.RPLNSH_CNT
, F.DMG_CNT
, F.RET_CNT
, F.PICK_CYC_CNT
, F.PICK_ERR_CNT
, F.RSV_CHK_CNT
, F.ERR_CNT
, F.DLY_CS_VRNC
, F.DLY_DLLR_VRNC
, F.CMB_THRUPUT
, F.DELAY_MINS_CNT
, F.DELAY_PCT
, F.UNLOAD_AVG
, F.LABOR_AVG
, F.SELECT_HR_CNT
, F.CRT_USERID
, F.CRT_DTE_TME
, F.UPD_USERID
, F.UPD_DTE_TME
, F.MTRC_ID
, F.MTRC_DTE
Order By E.DelDate
Please excuse the length of the code but one of the tables has a lot of columns.
Can anyone tell me if it's possble to do a join on an inline view?
Any help would be greatly appreciated.
Thanks in advance,
John
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Jan 30, 2006
Hello,
I am trying to understand the concept of left joins. I have the following query and am not sure about the left joins.
I am familiar with joins but the left join below is a little confusing.Below it seems like a third table is involved. Is this because there is no column to map to in the from table? Also, since tables sl and sc are mapped based on the SecurityID column and sl and ex do not have any common columns, table sc is mapped to ex using the left join? Which table's data will be returned based on the left join?
I checked the column type for the Exchange column(ex.LSECode) and it appears varchar(3).
SELECT SecurityID = sl.SecurityID
, Security = RTRIM(sec.Name) + ' - ' + RTRIM(sec.Description)
, Ticker = ISNULL(ids.RIC, ids.Ticker)
, Sedol = ids.Sedol
, ISIN = ids.ISIN
, Exchange = ex.LSECode
, Country = cty.iso_code
FROM #SecList sl
JOIN SecurityClassification sc
ON sl.SecurityID = sc.securityId
AND sc.source = 99
LEFT JOIN exchange_table ex
ON sc.ExchangeID = ex.exchange
Thanks in advance!!!
novicesql123
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Jul 23, 2005
Hi,I'm curious about the computational complexity of a query I have. Thequery contains multiple nested self left joins, starting with a simpleselect, then doing a self left join with the results, then doing a selfleft join with those results, etc. What puzzles me is that the timerequired for the query seems to grow exponentially as I add additionalleft joins, which I didn't expect. I expected the inner select toreturn about 25 rows (it does), then I expected the self join to resultin about 25 rows (it does), etc. Each join just adds another column; itdoesn't add more rows. So the left part of the join is staying the samesize, and so is the right part of the join, since I'm always joiningwith the same table.So I would think the time for this query should be (time to join 25rows against the source table) * (num joins), but it seems to besomething like (num rows) ^ (num joins). Any ideas? I'm just trying tounderstand the system a little better. (But if you have any ideas aboutimproving the query, I'm always open to those, too.)The execution plan is what you'd expect: an index seek loop-joined withanother index seek, the results of which are merge-joined with anotherindex seek, the results of which are merge-joined with another indexseek, ad nauseum, until a final "compute scalar cost (39%)" and "select(0%)"For the brave and curious, I've pasted the query below.Thanksselect right(x.cp_yyyymm, 2)+'-'+left(x.cp_yyyymm, 4) as [Month],table0.cp_num_loans/1 as [AFCM9704], table1.cp_num_loans/1 as[AFC9104], table2.cp_num_loans/1 as [BFAT01C], table3.cp_num_loans/1 as[BFAT02B], table4.cp_num_loans/1 as [BFAT03D], table5.cp_num_loans/1 as[BFAT03E], table6.cp_num_loans/1 as [BFAT03F], table7.cp_num_loans/1 as[BFAT04A], table8.cp_num_loans/1 as [BFAT04C], table9.cp_num_loans/1 as[BFAT04D], table10.cp_num_loans/1 as [BFAT99C] from (((((((((((selectdistinct cp_yyyymm from cp_deal_history where cp_deal_id in('AFCM9704', 'AFC9104', 'BFAT01C', 'BFAT02B', 'BFAT03D', 'BFAT03E','BFAT03F', 'BFAT04A', 'BFAT04C', 'BFAT04D', 'BFAT99C') and cp_yyyymmbetween 200304 and 200504) as x left join (select cp_yyyymm,cp_num_loans from cp_deal_history where cp_deal_id='AFCM9704') astable0 on x.cp_yyyymm=table0.cp_yyyymm) left join (select cp_yyyymm,cp_num_loans from cp_deal_history where cp_deal_id='AFC9104') as table1on x.cp_yyyymm=table1.cp_yyyymm) left join (select cp_yyyymm,cp_num_loans from cp_deal_history where cp_deal_id='BFAT01C') as table2on x.cp_yyyymm=table2.cp_yyyymm) left join (select cp_yyyymm,cp_num_loans from cp_deal_history where cp_deal_id='BFAT02B') as table3on x.cp_yyyymm=table3.cp_yyyymm) left join (select cp_yyyymm,cp_num_loans from cp_deal_history where cp_deal_id='BFAT03D') as table4on x.cp_yyyymm=table4.cp_yyyymm) left join (select cp_yyyymm,cp_num_loans from cp_deal_history where cp_deal_id='BFAT03E') as table5on x.cp_yyyymm=table5.cp_yyyymm) left join (select cp_yyyymm,cp_num_loans from cp_deal_history where cp_deal_id='BFAT03F') as table6on x.cp_yyyymm=table6.cp_yyyymm) left join (select cp_yyyymm,cp_num_loans from cp_deal_history where cp_deal_id='BFAT04A') as table7on x.cp_yyyymm=table7.cp_yyyymm) left join (select cp_yyyymm,cp_num_loans from cp_deal_history where cp_deal_id='BFAT04C') as table8on x.cp_yyyymm=table8.cp_yyyymm) left join (select cp_yyyymm,cp_num_loans from cp_deal_history where cp_deal_id='BFAT04D') as table9on x.cp_yyyymm=table9.cp_yyyymm) left join (select cp_yyyymm,cp_num_loans from cp_deal_history where cp_deal_id='BFAT99C') astable10 on x.cp_yyyymm=table10.cp_yyyymm order by x.cp_yyyymm
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Sep 21, 2007
Hello,
I have a query with 11 left joins. Some hits against tables with small amounts of reference data, whereas others are not so small. Should I rewrite this in another way, as performance is a requirement on this one? Or, should I do it another way?
How would I rewrite left joins? Any examples?
Thanks.
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Dec 16, 2002
Until today, I was always under the impression that left vs. right was determined by which side of the comparison operator the table was located.
In other words:
LEFT JOIN LeftTable.ID = RightTable.ID
would pull all the records from LeftTable and those that matched from from RightTable and that:
RIGHT JOIN RightTable.ID = LeftTable.ID
would pull exactly the same result set but I was wrong. So, if it is not the table position in relation to the comparison operator, is it simply that the tables listed first in the FROM clause aren the ones "Left" of those subsequently entered?
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Jul 24, 2012
I'm trying to write a 3 table query using two LEFT JOINs. Originally, I only had one LEFT JOIN and prior to the addition of the the third table (parts) this query worked. Now it doesn't. I think it has to do with my GROUP BY.
SELECT
quote.quote_id, parts.material, machining_operations.machine, machining_operations.per_roughing, machining_operations.per_of_machining,
machining_operations.programming_time, machining_operations.setup_time, machining_operations.cycle_time, machining_operations.notes
quote.part_name, quote.revision_no, quote.quantity, quote.initial_volume, quote.final_volume, quote.material_price, machining_operations.mo_id
FROM quote
LEFT JOIN machining_operations
ON machining_operations.quote_num = quote.quote_id
LEFT JOIN parts
ON parts.package_no = quote.package_no AND parts.part_name = quote.part_name
GROUP BY quote.quote_id
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Apr 28, 2008
Hi,
The following query should return a list of clr_id's that have a match in at least 1 of the other fields mentioned in the joins.
declare @keyWord varchar(40)
set @keyWord = 'merc'
set NOCOUNT on
SELECT distinct clr.clr_id
FROM CLR
LEFT OUTER JOIN CO ON CLR.CO_ID = CO.CO_ID
LEFT OUTER JOIN CLR_NM ON CLR.CLR_ID = CLR_NM.CLR_ID
LEFT OUTER JOIN CLR_USE_YR ON CLR.CLR_ID = CLR_USE_YR.CLR_ID
LEFT OUTER JOIN MODL ON CLR_USE_YR.MODL_ID = MODL.MODL_ID
LEFT OUTER JOIN PAINT_CD ON CLR.CLR_ID = PAINT_CD.CLR_ID
WHERE co.long_nm like '%'+@keyWord+'%'
OR clr_nm.clr_nm like '%'+@keyWord+'%'
OR clr_use_yr.yr_num like '%'+@keyWord+'%'
OR paint_cd.paint_cd like '%'+@keyWord+'%'
OR modl.modl_nm like '%'+@keyWord+'%'
The query runs at 3secs.
Could I improve the query somehow?
I was thinking that, since I actually need a distinct set of clr_id's, I should somehow check only the clr_id's that don't have a match in any of the previous joins.
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Apr 13, 2006
I have a situation where I'm trying to add a text field to allowlarge Notes to be linked to record in an existing table (rather thansimply adding the new field into the table since relatively fewrecords will have the Note)Tables are basically:T1IDInvNumFK----------------------40|142|243|244|1T2MatDetIdEqpNote-------------------------------------------------40|text44|additional NoteI'm trying to create a subform that will allow the user to view/updaterecords in T1 (there are other fields in T1 that aren't relevant tothe problem) and also add a record into the T2.EqpNote field or edit arecord that already exists.This query works in Access (allows me to type in text into the EqpNotefield and automatically create a new record in T2 with the T1.Id valuein the T2.MatDetId field) :SELECT T1.ID, T1.InvNumFK, T2.EqpNote, T2.MatDetIdFROM T1 LEFT JOIN T2 ON T1.ID = T2.MatDetIdWHERE (((T1.ID)=10230));but when I try to 'translate' it into a version that I can use for thesubform in the adp (it's an Access 2000 project with a SQL Server 2000backend) the 'child' record does not get added into T2.Here's the record source I'm using for the form in the adpSELECT T1.ID, T1. InvNumFK, T2.MatDetId, T2.EqpNote FROM T1 LEFTOUTER JOIN dbo.T2ON T1.ID =T2.MatDetIdWHERE T1.InvNumFk = XX--'master' tableCREATE TABLE [dbo].[T1] ([ID] [int] IDENTITY (1, 1) NOT NULL ,[InvNumFK] [int] NOT NULL) ON [PRIMARY]GOALTER TABLE [dbo].[tblBSMaterialDet] WITH NOCHECK ADDCONSTRAINT [PK_T1] PRIMARY KEY NONCLUSTERED([ID]) ON [PRIMARY]GO--Sub tableif exists (select * from dbo.sysobjects where id =object_id(N'[dbo].[T2]') and OBJECTPROPERTY(id, N'IsUserTable') = 1)drop table [dbo].[T2]GOCREATE TABLE [dbo].[T2] ([MatDetId] [int] NOT NULL ,[EqpNote] [text] COLLATE SQL_Latin1_General_CP1_CI_AS NULL) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]GOALTER TABLE [dbo].[T2] WITH NOCHECK ADDCONSTRAINT [PK_T2] PRIMARY KEY CLUSTERED([MatDetId]) ON [PRIMARY]
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Apr 29, 2008
Hi everybody,
In SQL Server is there a quick way to automatically insert empty value instead of NULL? I have a long Insert-SQL command with LEFT JOIN and don't want to use ISNULL for every field.
Researching on this in the meantime myself and I believe there is no way.
Thanks in advance.
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Mar 14, 2008
I am having an issue with large queries using Microsoft SQL Server 2005 - 9.00.2221.00 (X64).
I have a query with many INNER/LEFT OUTER/RIGHT OUTER joins which is taking very very very long to run. This looks exactly like this problem described in http://support.microsoft.com/kb/318530. However, this doc says it was fixed in SP1, which is already installed.
Basically I have a query:
SELECT ....
FROM TABLEA
INNER JOIN TABLEB ...
LEFT OUTER TABLEC...
LEFT OUTER TABLED...
RIGHT OUTER TABLEF...
LEFT OUTER TABLEJ..
LEFT OUTER TABLEH...
LEFT OUTER TABLEI...
RIGHT OUTER TABLEK...
LEFT OUTER TABLEM..
... 17 joined tables in all......
WHERE TABLEB.field1 = 'abc'
The query plan for this is using TABLEA as the "main" table and joining everything else to it. The problem is, TABLEA has 117 MILLION records. TABLEB has 10,000 records which match the WHERE. I stopped this query after it ran for 62 HOURS.
If I simply change the query to:
SELECT ....
FROM TABLEB
INNER JOIN TABLEA ...
LEFT OUTER TABLEC...
LEFT OUTER TABLED...
RIGHT OUTER TABLEF...
LEFT OUTER TABLEJ..
LEFT OUTER TABLEH...
LEFT OUTER TABLEI...
RIGHT OUTER TABLEK...
LEFT OUTER TABLEM..
... 17 joined tables in all......
WHERE TABLEB.field1 = 'abc'
The query runs in 15 mins. The query plan now uses TABLEB and the WHERE clause to join all the other tables.
The problem is, this query is generated from a report writter, and I have no control over the way it creates the SQL code.
Any ideas how I can fix this?
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Mar 8, 2015
We have a view with many left joins. The original creators of this view might have been lazy or sloppy, I don't know. I have rewritten the query to proper inner joins where required and also nested left joins.
So rather then the following exemplary fragment
select <many items>
from A
left join B on B.id_A = A.id
left join C on C.id_B = B.idthis now looks like
select <many items>
from A
left join (B
join C on C.id_B = B.id
) on B.id_A = A.id
Compilation time of the original view was 18s, of the new rewritten view 4s. The performance of execution is also better (not counting the compile of course). The results of the query are identical. There are about 30 left joins in the original view.
I can imagine that the optimizer has difficulty with all these left joins. But 14s is quite a big difference. I haven't looked into detail in the execution plans yet. I noticed that in both cases the Reason for Early Termination of Statement Optimization was Time Out.
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Oct 8, 2015
I was writing a query using both left outer join and inner join. And the query was ....
SELECT
S.companyname AS supplier, S.country,P.productid, P.productname, P.unitprice,C.categoryname
FROM
Production.Suppliers AS S LEFT OUTER JOIN
(Production.Products AS P
INNER JOIN Production.Categories AS C
[code]....
However ,the result that i got was correct.But when i did the same query using the left outer join in both the cases
i.e..
SELECT
S.companyname AS supplier, S.country,P.productid, P.productname, P.unitprice,C.categoryname
FROM
Production.Suppliers AS S LEFT OUTER JOIN
(Production.Products AS P
LEFT OUTER JOIN Production.Categories AS C
ON C.categoryid = P.categoryid)
ON
S.supplierid = P.supplierid
WHERE
S.country = N'Japan';
The result i got was same,i.e
supplier country productid productname unitprice categorynameSupplier QOVFD Japan 9 Product AOZBW 97.00 Meat/PoultrySupplier QOVFD Japan 10 Product YHXGE 31.00 SeafoodSupplier QOVFD Japan 74 Product BKAZJ 10.00 ProduceSupplier QWUSF Japan 13 Product POXFU 6.00 SeafoodSupplier QWUSF Japan 14 Product PWCJB 23.25 ProduceSupplier QWUSF Japan 15 Product KSZOI 15.50 CondimentsSupplier XYZ Japan NULL NULL NULL NULLSupplier XYZ Japan NULL NULL NULL NULL
and this time also i got the same result.My question is that is there any specific reason to use inner join when join the third table and not the left outer join.
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Aug 23, 2007
have the following code for ONE Inner Join, but I want to add another join for another Table and Fields.... can you help me with the syntax:
SELECT DISTINCT
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Feb 19, 2008
I cant find the problem with this query for the life in me
SELECT ForumTopic.*, websiteinfo.shortdomainname AS author, MemberInfo.postcount AS pc, MemberInfo.joined AS jd FROM ForumTopic INNER JOIN websiteinfo ON ForumTopic.domaininfoid=websiteinfo.domaininfoid INNER JOIN websiteinfo websiteinfo2 ON MemberInfo.domaininfoid=websiteinfo2.domaininfoid WHERE ForumTopic.id = 1
the error message is:
Msg 4104, Level 16, State 1, Line 1
The multi-part identifier "MemberInfo.domaininfoid" could not be bound.
Msg 4104, Level 16, State 1, Line 1
The multi-part identifier "MemberInfo.postcount" could not be bound.
Msg 4104, Level 16, State 1, Line 1
The multi-part identifier "MemberInfo.joined" could not be bound.
Can anyone help with this error? Thanks for any responses
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Feb 3, 2006
Hello,
I need to create a view which links 5 tables as follows:
I have a Header Table which is keyed on Product and Year which I want to join to a Detail Table which is keyed on Product and Year and Week. I want to see all of the rows from each table, which I think is a FULL OUTER JOIN.
I then have three subsidiary tables for Sales, Orders and Deliveries which are all keyed on Product and Year and Week - I want to join each of these tables separately to the Detail table above so that again I see all of the rows from the Detail Table, the Sales Table, the Orders Table and the Deliveries table. For any Product/YearWeek there may or may not be a row on any of the Sales, Order or Deliveries table, but there will not be any rows on these tables which are not on the Detail Table.
Can I do this in the FROM clause andnif so how, or do I need to do a series of separate SELECTs for the Sales, Orders & Deliveries table with UNION clauses.
Best regards
Colin
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Mar 28, 2012
Application called Filemaker, I'm now trying to use that experience to teach myself SQL (using Microsoft SQL is SQL 2008 r2).My question is can you have multiple self joins.
I have a table which has two columns (for this example)
spell | spellindicator | episode
the spell is not unique e.g. there could be several records with the spell 'A1234' the spellindicator column will contain a number 1 or 2. the data could look like
this:
spell-------spellindicator---------episode
A1234-----------1-----------------2
B5674-----------1-----------------1
C8739-----------2-----------------3
A1234-----------1-----------------1
B5674-----------2-----------------1
A123------------2-----------------2
A1234-----------1-----------------3
I want to create two left self joins:
1) to count the records that have the same order number with the spellindicator being 1.
2) to find the max and min episode
For 1) I've created two keys:
pk_indicator = spell +':1'
fk_indicator = spell + ':' + spellindicator
example data:
pk_indicator------fk_indicator
A1234:1-----------A1234:1
B5674:1-----------B5674:1
C8739:1-----------C8739:2
A1234:1-----------A1234:1
B5674:1----------- B5674:2
A1234:1-----------A1234:2
A1234:1-----------A1234:1
For2) The join is on the spell
Part 1) works fine on its own
Part 2) works fine on its own
But put both joins in the same statement and the count function no longer works correctly. I realise that there is an issue with the self joins but I thought it would be possible to have multiple self joins.
use leis
go
select l1.spell, l1.spellindicator, l1.episode, l1.pk_Indicator, l1.fk_indicator
,maxepisode = MAX(e2.episode)
,minepisode = MIN(e2.episode)
[code]....
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Oct 23, 2007
I have a customer table which has customer billing addresses; an orders table which has payment and shipping method info; and an items table which has line items for each order. The customer table has a custnum index field. The orders table has a custnum and orderid field. And the items table has an orderid field.
I'd like to be able to retrieve, in one query, the customer's billing address, all of their orders, with each of their order's line items.
What would the query look like in order to accomplish this?
Thanks in advance.
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Apr 4, 2006
I have a left Join problem - Appreciate any suggestions
This is the error message
C:InetpubwwwrootFTDecAdminFinishedAdminBeta2.aspx(47) : error BC30201: Expression expected. "tered] FROM [Colleges] "& _ ~ C:InetpubwwwrootFTDecAdminFinishedAdminBeta2.aspx(49) : error BC30035: Syntax error. " Left Join [PIDO] ON ([Colleges].[CollegeID] = ([PIDO].[CollegeID]) "& _ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ C:InetpubwwwrootFTDecAdminFinishedAdminBeta2.aspx(53) : error BC30451: Name 'queryString' is not declared. dbCommand.CommandText = queryString ~~~~~~~~~~~This is the Code
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
FROM [Colleges] "& _ '" Left Join [PIDO] ON ([Colleges].[CollegeID] = ([PIDO].[CollegeID]) "& _ " left join [GroupPA] ON ([Colleges].[CollegeID] = [GroupPA].[CollegeID])ORDER BY "& sortBy
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
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Mar 7, 2001
Here is what I am currently doing:
********************************************
SELECT Hours.Hours, Hours.Comments
FROM Hours INNER JOIN Employee
ON Employee.UserID = Hours.UserID
INNER JOIN Task
ON Hours.TaskID = Task.TaskID
INNER JOIN Project
ON Hours.ProjID = Project.ProjID
WHERE Hours.Date <= EndDate
AND Hours.Date >= StartDate
AND Hours.Date <= EndDate;
********************************************
Am I doing something wrong here?
Any help would be greatly appreciated!
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Oct 29, 2006
I'm trying, with little success, to achieve something that should be quite easy (I think!) and any advice would be appreciated.
I have a leagues table structured so:
LeagueID | Name | Player1 | Player 2 ... Player6
and the data in the player columns is a userid from the users table and I'm trying to display the Leagues but with the player names rather than player IDs.
I'm working along the lines of
Code:
select
u1.displayname as Player1,
u2.displayname as Player2
from DCMLeagues as L
inner join Users as u1 on L.player1 = u1.userid
inner join Users as u2 on L.player2 = u2.userid
but with little success so far. Any thoughts would be appreciated! Thanks very much in advance.
-- Chris
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Apr 9, 2012
I'm putting together the site for a local darts league, essentially each of the teams completes an 'e-scorecard' for that particular game. This is then stored in a table named 'scorecardIndex' :
scxUID(PK)scxTeam1(int)scxTeam2(int)scxTeam1Capt(int)scxTeam2Capt(int)scxDate(nvarchar 50)scxSubmitBy(int)
So each 'index' points off to the UID of the player who was captain, and the UID of of each team.
What I'm struggling with is joining this all together, as I'm joining both scxTeam1Capt and scxTeam2Capt to the same columns in the 'players' table (plFirstName, plSurname)
plUID(PK)plFirstName(nvarchar 50)plSurname(nvarchar 50) plTeamUID(int)plEmail(nvarchar80)plPassword(nvarcharMAX)
And equally joining scxTeam1 & scxTeam2 to the Teams table to pull back the teams actual name.
Using several inner joins I can pull back the entire row for each team, but the columns have the same name..
SELECT *
FROM scorecardIndex AS S
INNER JOIN teams AS T1
ON T1.teamUID = S.scxTeam1
INNER JOIN teams AS T2
ON T2.teamUID = S.scxTeam2
I'm using MS SQL Server 2008 R2.
I've tried to be as detailed as possible without overdoing it.
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Dec 7, 2013
Table 1:
id amount
1 100
2 200
3 300
4 400
Table 2:
id amount
1 100
1 100
2 200
3 300
4 null
Table 3:
id amount
1 null
2 200
2 200
3 300
3 200
4 null
id is common for each tables , how can i get output like this:
Collapse | Copy Code
id t1 t2 t3
1 100 200 null
2 200 200 200
3 300 300 500
4 400 null null
I am stuck with this query .
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Aug 21, 2014
In the below query
with cte1
as (select siteid
,productcategory
,sum(isnull(netsales,0)) as netsales
from dbo.vw_sv_invoicedetail
where invoicedate>=dateadd(dd,-90,getdate())
[Code] ....
I need to add routeid column so that i can finally display sum of sales grouped by routeid in addition to the siteid that i am already displaying.
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