Categories table with CategoryID, Title, CategoryParentID columns
Questions table with QuestionID, Text columns
CategoriesQuestions table with CategoryID, QuestionID columns
Now I want to make the query which takes QuestionID and return all Categories of that provided QuestionID.
I already have made that query in 2 different styles.
First I make an Inner Join to retrieve the results
Select Categories.* from Categories Inner Join CategoriesQuestiosn on Categories.CategoryID = CategoriesQuestions.CategoryID where CategoriesQuestions.QuestionID = 1
Second I make a sub query to retrive the results.
Select * from Categories where CategoryID In (Select CategoryID From CategoriesQuestions where QuestionID = 1)
Now I am asking what is the better one in respect to performance.
Hi all,Just after some help with a query (Stored Procedure) I've managed to get wrapped round my head.The DB is as such:
COMPANY Company_id Company_name COMPANY_GROUP Group_id Group_name USER User_id User_name Bridging tables
COMPANY_GROUP_BRIDGE company_id group_id
USER_COMPANY_BRIDGE user_id company_id Basically, the only parameter I have for the query is a User_id.I need to get the Group linked to the User and return all the companies within that group. I've tried reading up on all the join types again but have just got this completely wrapped round my neck. I keep thinking along the lines of SELECT all the companies linked to all the groups linked to all the companies linked to the User_id :s I must be able to do this without using two Company tables...? Any help much appreciated,Pete
Iwrote a query right, and need to get further information out of another table, so did a Join, but then also need to get further information out of another table..So, I need to add this query:
SELECT PERSONNUM as EmployeeCode ,[FIRSTNM] as Firstname ,[LASTNM] as LastName ,[HOMELABORLEVELDSC1] as Site ,[HOMELABORLEVELNM1] as SiteID FROM [tkcsdb].[dbo].[VP_ALLPERSONV42]where USERACCOUNTSTATUS = 'active' and homelaborlevelnm1 in ('11', '13', '32') order by SiteID, LastName
select ad.bank,ad.account_number,ad.account_short_name, p.security_id,isnull(b.NAME,isnull(tw.name,ms.name)) as SecurityDescription, p.security_price,mc.classcode, sum(case when p.security_price = 9999999.99900 then 0 when mc.classcode between '000'and'299' then (p.quantity * p.security_price) / 100 when mc.classcode between '950'and'999' then (p.security_price * p.quantity) * -1 when mc.classcode between '300' and '324' or mc.classcode between '330' and '399'then p.acm_ctf_mtf_price * p.quantity when p.security_price = '0' then p.cost else (p.security_price * p.quantity) end) as MV,p.position_date,p.quantity,p.cost,p.acm_ctf_mtf_price from positions p left join BloombergEquityData b on p.security_id = b.ID_CUSIP left join account_detail ad on p.account_id = ad.account_id left join metavanteclasscodes mc on p.security_id = mc.cusip left join MacgregorSecurityMaster ms on p.security_id = ms.cusip left join TobaSecurityWarehouse tw on p.security_id = tw.cusip where p.position_date = '03/05/2008' and ((ad.investment_authority_id in ('2','3') and ad.bank in ('98','7R')) or ad.bank = '9W')-- and ad.account_number = '41G006012' group byad.account_number,ad.account_short_name,p.security_id, ms.name,b.NAME,p.security_price,p.position_date,ad.bank,mc.classcode,p.quantity,p.cost,p.acm_ctf_mtf_price,isnull(b.NAME,isnull(tw.name,ms.name)) order by ad.account_number,p.security_id
For a given day, in this example 3/5 if I were to just select all the records I would get back around 550,000. If I put the filter on where I tell it to just show me one account its snappy. If I remove that filter and have it show me all the accounts it take forever. Here is the layout of my positions table where i am pulling the majority of the information:
CREATE TABLE [dbo].[positions]( [account_id] [int] NOT NULL, [security_id] [varchar](50) NOT NULL, [position_date] [smalldatetime] NOT NULL, [quantity] [decimal](18, 5) NOT NULL, [cost] [decimal](18, 5) NULL, [security_price] [decimal](18, 5) NULL, [acm_ctf_mtf_price] [decimal](18, 9) NULL, CONSTRAINT [PK_positions] PRIMARY KEY CLUSTERED ( [account_id] ASC, [position_date] ASC, [security_id] ASC )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] ) ON [PRIMARY]
GO SET ANSI_PADDING OFF
My questions is if you can identify any reason why the query might take more than 10 minutes (actually still running after 10 minutes) to complete when I have it bring me back all the records, not sure if its a lack of indexes or what, but was hoping for some suggestions on what I might be missing. I apologize if I havent included enough information, still learning how to troubleshoot the performance side of things.
Not sure if this is right place to ask but here is our problem. We are getting records from more than one table. Table1 and Table2 for example Both Tables haveid, value table11, 201, 30 Table 21, 501, 40 here is the queryselect table1.id, table1.value, table2.value from Table1inner join Table2on Table1.id = table2.idproblem is this returns 4 rows like this1, 20 , 501, 30 , 501, 20 , 401, 30 , 40 When we need it to return1, 20 , null1, 30, null1, null, 401, null , 50 any help on this would be appreciated.Thank You in advance.
Hi all.I want to use the following query in a sp to enable paging using ObjectDataSource.The problem (being EXTREMELEY slow) arises when I add these joins and where statements. SELECT r.RID AS ReqID, r.Name AS ReqName, r.Family AS ReqFamily,t3.Name AS DistName, t4.Name AS RurName,t5.Name AS VilName, n.Name+' '+n.Family AS NazerName ,ROW_NUMBER() over (order by r.Family) AS RowRankFROM Requests rLEFT OUTER JOIN Nazeran n ON r.nazerID = n.ID LEFT OUTER JOIN t1States t1 ON t1.ID = r.StateID LEFT OUTER JOIN t2Provinces t2 ON t1.ID = t2.StateID AND r.ProvID = t2.ID LEFT OUTER JOIN t3Districts t3 ON t2.ID = t3.provID AND t1.ID = t3.stateID AND r.DistID = t3.ID LEFT OUTER JOIN t4RuralDistricts t4 ON t3.ID = t4.distID AND t2.ID = t4.provID AND t1.ID = t4.stateID AND r.RurID = t4.ID LEFT OUTER JOIN t5Villages t5 ON t4.ID = t5.rurID AND t3.ID = t5.distID AND t2.ID = t5.provID AND t1.ID = t5.stateID AND r.VilID = t5.IDWHERE r.stateid=(case when @StateID is null or @StateID='' then r.stateid else @StateID end) and r.provid=(case when @provID is null or @provID='' then r.provid else @provID end) and r.rID=(case when @ReqID is null or @ReqID='' then r.rID else @ReqID end) and isnull(r.nazerID,'')=(case when @nazerID is null or @nazerID='' then isnull(r.nazerID,'') else @nazerID end) and r.name+' '+r.family like (case when @ReqName is null or @ReqName='' then r.name+' '+r.family else '%'+@ReqName+'%' end) **there are 1million rows in [Requests] table ,200000 rows in [t5villages], and about total 5000 rows in other tables.As you can see, this is for a GridView showing list of people requesting a loan allowing users to make alternative searches based on Name, Familyname ,ID ,... would you please help me optimize and make fast this query.Many thanks..
I wrote a SQL query that firstly do an outer-join for two table and after I add another table with outer-join as well. I'm getting the following message: Server: Msg 301, Level 16, State 1, Line 1 Query contains an outer-join request that is not permitted. May be someone knows what is it? If I remove the second join- it work....
Ok I have a complex query that works great, but now I need to join yet another table but the problem is, the value that links it to the rest of the query is a value that is returned from a case statement earlier in the query...
For Example...
SELECT var1, var2, var3, CASE T1.Number WHEN 0 THEN T2.Result ELSE T3.Result END as var4 FROM TABLE1 T1 LEFT OUTER JOIN TABLE2 T2 on T2.Value=T1.Value LEFT OUTER JOIN TABLE3 T3 on T3.Value=T1.Value2
Above is a generalized, much smaller example of my working Query. Now what I need to do is join TABLE4 but the value I need to connect it to the rest of the query is var4, which can come from 2 different places depending on the value of T1.Number
Basically the logic I need to make it work is to either have a case statement in my JOIN. Like, 'LEFT OUTER JOIN TABLE4 on T4.Value=(CASE T1.Number WHEN 0 THEN T2.Result ELSE T3.Result END)'
Is this even possible and if so, how? I need to keep the logic in the main query to preserve performance...
Daily_Time_Entry Fields are: dl_id,dt_id,project_type,project_id,time_st Data in table Daily_Time_Entry
dl_id dt_id project_type project_id time_st 1 03/23/08 AB Corporate 1 1.20 2 03/23/08 AB Corporate 2 3.25 3 03/21/08 AB Corporate 1 2.25 4 03/23/08 AB Plant 1 4.35 5 03/23/08 AB Plant 2 4.50 6 03/23/08 Other Project 1 3.24 7 03/23/08 Other Project 2 4.35
I want to show records as per date from Daily_Time_Entry table and detail data to be displayed as follows
dl_id dt_id project_type project_id time_st exp1 exp2 exp3 owner_name 1 03/23/08 AB Corporate 1 1.20 3 -- -- tmw 2 03/23/08 AB Corporate 2 3.25 2 -- -- hologa 3 03/21/08 AB Corporate 1 2.25 3 -- -- tmw 4 03/23/08 AB Plant 1 4.35 -- 1 -- henry 5 03/23/08 AB Plant 2 4.50 -- 2 -- hologa 6 03/23/08 Other Project 1 3.24 -- -- 2 hologa 7 03/23/08 Other Project 2 4.35 -- -- 3 tmw
Also in project_type AB Corporate for AB_Corporate_Project, AB Plant for AB_Plant_Project , Other Project for Other_Project
I write query for this is as follows
Select dl. dl_id,dl.dt_id,dl.project_type,dl. project_id,dl.time_st,ac.owner_rep_id as exp1,ab. owner_rep_id as exp2,op. owner_rep_id as exp3,ow. owner_name From Daily_Time_Entry dl left outer join AB_Corporate_Project ac on dl. project_id = ac. ab_crp_id and dl. project_type=’ AB Corporate’ left outer join AB_Plant_Project ab on dl. project_id =ab. ab_plant_id and dl. project_type=’ AB Plant’ left outer join Other_Project op on dl. project_id = op. other_proj_id and dl. project_type=’ Other Project’ inner join Owner_Rep ow on (ow. owner_rep_id = ac. owner_rep_id) or(ow. owner_rep_id = ab. owner_rep_id)or (ow. owner_rep_id = op.owner_rep_id)
So how can I write query to show output as follows or any other way or how to create Sql cursors for to show output Plz help to solve this query to show output as specified.
Hi all,I have the following tables:A1==HostID Name RunID------ ---- -----1 host1 NULL2 host2 13 host3 NULLA2==RunID SessionID----- ---------1 42 2A3==SessionID Name--------- ----4 Session12 Session3I want to show every record from A1 with SessionName from A3, unlessthe field RunID in A1 is NULL and then I want to see NULL, like this:HostID Name RunID Name------ ---- ----- ----1 host1 NULL NULL2 host2 1 Session13 host3 NULL NULLwhen I try the following query:select A1.*, A3.Namefrom A1, A2, A3where A1.RunId *= A2.RunId and A2.SessionID = A3.SessionIDI get the following error:The table 'A2' is an inner member of an outer-join clause. This is notallowed if the table also participates in a regular join clause.How can I overcome this problem. Please help. (I use this syntax isteadof joins since I have to supprt also Oracle DB and this syntax issimpler to translate).Thanks in advance,Yaron
Hi,I have a view(A) and I am trying to do a join on another table (B) toinclude only rows where date values in view A is greater than in tableB. I also want the view to pick up rows in viewA based on date values.Here is what I have so far:SELECT *FROM viewA vwleft JOIN tableB tb ONvw.id = tb.id and(vw.date1 > tb.date1 orvw.date2 > tb.date2 orvw.date3 > tb.date3)WHERE vw.date4 > getdate()-1Not matter what kind of join I use I can get both the rows from theview where dateA > getdate()-1 AND where date1-3 are greate than intableB. Dates 1 - 4 seperate date fields. Could someone please tellme what I am doing wrong.Thanks.
HelloLet me explain the problem I am having:I have two tables, data_t and a_data_ta_data_t is the archive table of data_tThe two tables are exactly the same.In the table values are stored:Value (A numeric value)Code (A text code to identify a report with data)Line (The line number)Col (The Col Number)EDate (The date of entry)Grp (A number of a group the data belongs to)I want to get the value from data_t minus the value from a_data_t withthe same Code, Line and Col but with a different EDate (To view thevariance).Here is my statement:select d1.line, d1.col, (IsNull(d1.value,0) - IsNull(d2.value,0)) asvalue from data_t d1full outer join a_data_t d2 on d1.Code = d2.Code and d2.line = d2.lineand d1.col = d2.colwhered1.Code = 'XC001' and d1.line between 1 and 20 and d1.grp = 26and d1.EDate = '2006/06' and d2.grp = 26 and d2.EDate = '2006/05'order by d1.line, d1.colIt works fine EXCEPT when there is a value in either of the tables thatisn't in the other one, then a value is not given.Example:data_t doens't have a value for line=1 and col=2 and grp=26 and Code ='XC001' and EDate = '2006/06'a_data_t has the value of 50000 for the same details (Except Edate of'2006/5')Instead of returning -50000 it doesn't return anything.I hope I could explain it correctly.Any help will be greatly appreciated.Thanks.
Daily_Time_Entry Fields are: dl_id,dt_id,project_type,project_id,time_st Data in table Daily_Time_Entry
dl_id dt_id project_type project_id time_st 1 03/23/08 AB Corporate 1 1.20 2 03/23/08 AB Corporate 2 3.25 3 03/21/08 AB Corporate 1 2.25 4 03/23/08 AB Plant 1 4.35 5 03/23/08 AB Plant 2 4.50 6 03/23/08 Other Project 1 3.24 7 03/23/08 Other Project 2 4.35
I want to show records as per date from Daily_Time_Entry table and detail data to be displayed as follows
dl_id dt_id project_type project_id time_st exp1 exp2 exp3 owner_name 1 03/23/08 AB Corporate 1 1.20 3 -- -- tmw 2 03/23/08 AB Corporate 2 3.25 2 -- -- hologa 3 03/21/08 AB Corporate 1 2.25 3 -- -- tmw 4 03/23/08 AB Plant 1 4.35 -- 1 -- henry 5 03/23/08 AB Plant 2 4.50 -- 2 -- hologa 6 03/23/08 Other Project 1 3.24 -- -- 2 hologa 7 03/23/08 Other Project 2 4.35 -- -- 3 tmw
Also in project_type AB Corporate for AB_Corporate_Project, AB Plant for AB_Plant_Project , Other Project for Other_Project
I write query for this is as follows
Select dl. dl_id,dl.dt_id,dl.project_type,dl. project_id,dl.time_st,ac.owner_rep_id as exp1,ab. owner_rep_id as exp2,op. owner_rep_id as exp3,ow. owner_name From Daily_Time_Entry dl left outer join AB_Corporate_Project ac on dl. project_id = ac. ab_crp_id and dl. project_type=€™ AB Corporate€™ left outer join AB_Plant_Project ab on dl. project_id =ab. ab_plant_id and dl. project_type=€™ AB Plant€™ left outer join Other_Project op on dl. project_id = op. other_proj_id and dl. project_type=€™ Other Project€™ inner join Owner_Rep ow on (ow. owner_rep_id = ac. owner_rep_id) or(ow. owner_rep_id = ab. owner_rep_id)or (ow. owner_rep_id = op.owner_rep_id)
So how can I write query to show output as follows or any other way or how to create Sql cursors for to show output Plz help to solve this query to show output as specified.
Hello.... i have 4 tables in a databse(tab1,tab2,tab3,tab4). id is the attribute of TAB1 and id also foreign key of all the tables.....That mean id attribute exists on all the tables........so when i want to query to more than 1 table , i have to go for Joins...basically i am using innerjoin......... Can u tell me is there any other way to find the same output as the innerjoin......without using the keyword INNER JOIN for example ......SELECT * FROM TAB1 INNER JOIN (TAB2 INNERJOIN TAB3 ON TAB2.ID=TAB3.ID) ON TAB1.ID=TAB2.ID
another query........ SELECT *FROM TAB1,TAB2,TAB3 WHERE (TAB1.ID=TAB2.ID) AND (TAB2.ID=TAB3.ID) AND (TAB3.ID=TAB1.ID) above queries are same or not??????????
USING A WHERE CLAUSE and Alias ------------------------- select a.emp_name from dbo.dba a, dbo.project b where a.empid =b.project_emp and b.project_name is not null
USING A JOIN ----------------- select emp_name from dbo.dba as a inner JOIN dbo.project ON empid = dbo.project.project_emp AND dbo.project.project_name is not NULL
******
I find from the Estimated plan that both the queries give the same amount of cost ( I/O, CPU, et all ) :shocked:
Any comments/ suggestions.
Thanks,
Have a great time -Ranjit.
------------------------------------- It pays to be honest to your DBA
I have a single table named PROCESS which contain following three fields
ProcessID ParentID, info
* Every process have a unique ProcessID and ave single parent process which is identified by ParentID.
* If a process does not have a Parent then its ParentID value is -1.
*Only single level of Parent-child hierarchy is maintained.
Can anyone please tell me the Query that uses Recursive JOINS to retrieve the ProcessID s based in following Conditions.
1. if the Parent's 'info' field contains given value then retrieve all the process under it. 2. Retrive all the process whose 'info' contains given value and excluding the Processes resulted from 1st conditiion
I have a couple of tables that look like this (not excactly but closeenough):[Contact]id intfname varchar(50)lname varchar(50)[ContactPhoneNumber]id intnumber varchar(15)ext varchar(6)contact_id intpriority int (indicates primary, secondary... numbers)type int (indicates type of number: fax, cell, land line)I'm looking for a more optimized method of displaying this informationin this format:fname, primary business phoneUsing a derived column like this works, but seems to be slow with manyrecords, despite tuning indexes:SELECT c.fname AS [First Name],( SELECT TOP 1numberFROM ContactPhoneNumber cpnWHERE cpn.type = 1AND cpn.contact_id = c.idORDER BY cpn.priority) AS NumberFROM Contact cI can get the same results using a join, and it's a lot faster. But I'mnot sure how to select only the primary phone number this way...basically the first phone number whose priority is either NULL or 1.Any suggestions?*** Sent via Devdex http://www.devdex.com ***Don't just participate in USENET...get rewarded for it!
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?
I would like to populate a grid with data from 2 different tables. Table1: [PK]id(int), name(nvarchar), areaID(int) Table2: [PK][FK]areaID(int), areaDescription(nvarchar)
My cerrent query is: SELECT Table1.id, Table1.name, Table2.areaDescription FROM Table1 INNER JOIN Table2 ON Table1.areaID = Table2.areaID
However, sometimes the areaID in Table1 will only be populated at a later stage and therefore will be NULL in Table1. Table2 is used as a lookup table when inserting into Table1. This query therefore ommits any records in Table1 which do not have an areaID. I would like to view ALL records(ones without an areaID as well) as they would be populated in the grid and selected to be updated on web forms because they are incomplete and then subsequently assigned an areaID.
Any help with this query would be much appreciated...
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
I’ve never written a query with multiple APPLY joins before and I’m running into some troubles with my first one. The below SQL statement runs within 10 seconds if I comment out either one of the APPLY joins and its corresponding field columns. However, when I try to execute with both APPLY joins, the query runs indefinitely. The longest I’ve waited before cancelling it is 90 minutes.
Now, I know there are probably other ways I could write this query to get me the results I’m looking for. I’m posting this on the board because I’m curious about finding out why multiple APPLY joins could cause SQL Server to run away. I’m hoping to gain some insight so that I can better understand how APPLY joins work so that in case I have a big need to do this again in the future (without suitable workarounds) I can code it correctly.
Here are some things I’ve tried so far…
1.Changed the States table into a subquery that only returns a single state 2.Change all the references inside the APPLY subqueries so that they had different aliases (just in case they were conflicting with each other). 3.Changed the CROSS applies to OUTER applies. States has 50 records and only 32 have matching permit data so the 18 extra iterations using OUTER APPLY don’t impact performance any when an APPLY is used by itself.
SELECT s.state_name , COUNT(DISTINCT DUPS.PermitNumber) AS NumOfDupPermits , SUM(DistinctPermits) AS DistinctPermits FROM States S CROSS APPLY (SELECT w.StateID, COUNT(*) as DistinctPermits
I am building a application, which will generates a MASTER query with 15 fields & 5 tables joins.Now, the user selects only some fields from that master fields and generates the CHILD query. This is creating a performance issue.
To minimize this, i would like to remove the not necessary joins in the child query.
Table structure is very simple as below and I know there are solutions with joins (Left outer joins), need to know if it is possible to get o/p without using joins
Note:- also need records who doesn't have manager (null)
I have this query I need for a report. Originally it was 4 queries to be used in Crystal Reports. Now I want to create the same report with SSRS and therefore I incorporated all queries in one in order not to use subreports [URL].....
Tempdb fills up to nearly 90 GB. I am running SQL Server on a local box, so I am sure there is no other traffic. Here is the query:
SELECT AdHaupt.NSprache_ID ,AdHaupt.mengentext AS mengentextHaupt ,AdHaupt.Einzelpreis ,AdHaupt.Anzeigebezeichnung ,AdHaupt.Gesamtpreis
[Code] ...
I ran it with TOP 10 as well, just to see if it will finish at all, but it never did (ran for an hour now).
Hello All & Thanks in advance for your help!Background:1) tblT_Documents is the primary parent transaction table that has 10fields and about 250,000 rows2) There are 9 child tables with each having 3 fields each, their ownPK; the FK back to the parent table; and the unique data for thattable. There is a one to many relation between the parent and each ofthe 9 child rows. Each child table has between 100,000 and 300,000rows.3) There are indexes on every field of the child tables (though Idon't believe that they are helping in this situation)4) The client needs to be presented a view that has 5 of the mainfields from the parent table, along with any and all correspondingdata from the child tables.5) The client will select this view by doing some pattern-matchingsearch on one of the child records' detail (e.g. field-name LIKE%search-item% - so much for the indexes...)Problem:When I do the simple join of just the parent with one of the children,the search works *fairly* well and returns the five parent fields andthe corresponding matching child field.However, as soon as I add any one of the other child records to simplydisplay it's unique data along with the previously obtained results,the resulting query hangs.Is the overall structure of the tables not conducive to this kind ofquery? Is this a situation where de-normalization will be required toobtain the desired results? Or, more hopefully, am I just an idiotand there is some simpler solution to this problem?!Thanks again for your assistance!- Ed
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.
Problem is that if the [Receiving] table doesn't have a match then no records are return. I want all matches from the [Orders Subtable] and any matches from the [Receiving] Table. If no [Receiving] table matches then I still want all matches from the [Orders Subtable]. Attached is the query.
Note: The query has to run in Access 2000 and I will be coding it in VB.
FROM (Orders LEFT JOIN Receiving ON Orders.[Orders ID] = Receiving.[Orders ID]) INNER JOIN [Orders Subtable] ON Orders.[Orders ID] = [Orders Subtable].[Orders ID]
GROUP BY Orders.[Orders ID], [Orders Subtable].ID, [Orders Subtable].Quantity, Receiving.Quantity, Orders.[Project #], [Orders Subtable].On_Order, [Orders Subtable].[Component #], Receiving.[Component #]
HAVING (((Orders.[Project #])="Speed1aaaaa") AND (([Orders Subtable].On_Order)=True) AND (([Orders Subtable].[Component #])="R02101A") AND ((Receiving.[Component #])="R02101A"));
We find that a delete command on a table where the rows to be deleted involve an inner join between the table and a view formed with an outer join sometimes works, sometimes gives error 625.
If the delete is recoded to use the join key word instead of the = sign then it alway gives error 4425.
625 21 0 Could not retrieve row from logical page %S_PGID by RID because the entry in the offset table (%d) for that RID (%d) is less than or equal to 0. 1033 4425 16 0 Cannot specify outer join operators in a query containing joined tables. View '%.*ls' contains outer join operators. The delete with a correleted sub query instead of a join works.
Error 4425 text would imply that joins with view formed by outer joins should be avoided.
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.
