SQL Server 2008 :: Optimizing Join With CASE Statement
Jul 20, 2015
I have data that I want at multiple granularities, 5,15,30 and 60 minutes. To reduce repetition, I have put them all in the same table, so that there is a column for 5,15,30 and 60 minutes, with a filtered index on each of the columns that removes the nulls. This means that each day will have 288 slots, but only 24 of the slots are filled in for 60 min data, and all of them are filled for 5 minute data.
I have another column that specifies the interval granularity, and my first thought was to access my data through a join, where I can use a CASE statement, and depending on the data granularity necessary, it will look at a different column:
INNER JOIN Data d ON
AND d.settlement_key =
CASE st.interval_granularity
WHEN 5 THEN [5_min_settlement_key]
WHEN 15 THEN [15_min_settlement_key]
WHEN 60 THEN [60_min_settlement_key]
ELSE NULL END
Despite the presence of the indexes on the columns, then the process seems to be quite slow, I think probably due to the fact that any query plan isn't going to know beforehand which of the columns it is going to use for any given dataset, until it actually starts to run, so it may not be optimised.
How I could optimise this based on the given structure? Maybe there are hints to be added to the join, or maybe I can clear the query plan each time the SQL is run? My other option for dealing with the data of different granularity was to use one column and repeat the data multiple times, each at the different granularity, but this makes my data, row and table sizes much higher, as we are adding just a column for each additional granularity. Would this work any better in future versions of SQL server, maybe with column store indexes?
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Oct 18, 2005
Is it possible to have a join with case statement in it?
i.e.
select * from a inner join b on
case [x] then a.xid = b.xid
case [y] then a.yid = b.yid?
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Oct 16, 2007
Hi, I have two tables TABLE_A and TABLE_BTABLE_A has rows like this:PROJECT_IDTASK_ID TASK_NAME1 100 One Hundred1 110 One Hundred Ten1 120 One Hundred Twenty2 200 Two Hundred3 300 Three Hundred3 310 Three Hundred TenTABLE_B has rows like this:PROJECT_IDTASK_IDAMOUNT1 10010001 11011002 NULL20003 3003000I want to inner join TABLE_A and TABLE_B such that if TASK_ID is available in TABLE_B, then join should happen on TASK_ID (on TABLE_A.TASK_ID=TABLE_B.TASK_ID), if TASK_ID is not available the join should happen on PROJECT_ID.For example for PROJECT_ID=2, there is no TASK_ID in TABLE_B (in this situation the join should be ON PROJECT_ID)How can we do a CASE like situation here?Thanks in advanceqA
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Apr 24, 2007
Hi,
I have a 2 different telephone number tables,
Table 1 has some numbers beginning with '0' i.e. 08001234567 and some without the '0' i.e 8001234567
on my Table2 i only have numbers starting with '0' i.e 08001234567.
I would like to make a INNER JOIN statement and check if the telephone number dont have a starting '0', then append to it and try to do the join so I get both set of data.
for example (this doesnt work however...):
SELECT *
FROM dbo.Calls INNER JOIN
ON
CASE WHEN SUBSTRING(dbo.CallData.TelephoneNumber, 0, 1) = '0'
THEN dbo.Calls.TelephoneNumber = dbo.Post.TelephoneNumber
ELSE '0' & dbo.Calls.TelephoneNumber = dbo.Post.TelephoneNumber <--append a 0 at the start
END CASE
AND dbo.Products.FK_Client = dbo.CallDataSets.FK_Client
GROUP BY dbo.CallDataSets.FK_Client
I hope you understand what I am trying to achieve here...
Any help is appreciated!
Many thanks,
Jon
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Sep 26, 2007
Hi All,
I am in need for to write the following query for a stored procedure in SQL Server 2000. Please observe the T-SQL code first.
Please disregard the numbers and Product Numbers, they are not the correct data. I used them for ease of understanding. But the query is identical.
Code Block
SELECT
C.iOwnerid,
MAX (C.DtInsertDate) AS [dtLastIssueDate]
INTO #Tble
FROM CustomerProduct C
CASE WHEN @vchSubscription = 'Weekly' THEN
INNER JOIN ProductMaster PM ON PM.chProductNumber = C.chProductNumber
AND ( ( PM.vchUser7='101557' AND PM.vchUser8='101557' ) -- Category and SubCategory
OR PM.chProductNumber IN (
'weekly1', 'Weekly2', 'Weekly3', 'Weekly4' )
)
AND C.dtInsertDate > = @dtIssueDate CASE WHEN @vchSubscription = 'Monthly' THEN
INNER JOIN ProductMaster PM ON PM.chProductNumber = C.chProductNumber
AND ( ( PM.vchUser7='101557' AND PM.vchUser8='101557' )
OR PM.chProductNumber IN (
'Jan', 'Feb', 'Mar', ....'Dec')
)
AND C.dtInsertDate > = @dtIssueDate
END
GROUP BY C.iOwnerid, PM.vchUser7, PM.vchUser8
my requirement is join the same table, but depending on the subscription type i have to join to different product numbers.
I hope you understand. I have been trying this since yesterday, but no luck.
Any help would be greatly appreciated.
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Jan 29, 2015
I am trying to use this logic into a query:
Select P.S,E.S,E.R
from Pack P(nolock)
join Exp E on P.Id=E.O
on E.R is null
case when E.R is not null then ''
else ''
end
where P.s='PLT000044'
I have to query two conditions joining the tables. when E.R is NULL and when E.R is not null. but the value is coming from the join between the 2 tables :P and E.
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Jun 22, 2006
I'm trying to join a table and based on the value of a given column I would join using the column in question, however if the column is NULL then I want to make the join without the column in the join. so I think I want to do something like this:
Case E.a
when NULL
then LEFT JOIN EPD ON EPD.b = D.b
AND EPD.SD = (SELECT MAX(E1.SD) FROM E1
WHERE E1.b = EPD.b AND E1.a = EPD.a AND E1.SD <= T.WD)
Else
LEFT JOIN EPD
ON EPD.a = D.a
and EPD.b = E.b
AND EPD.SD = (SELECT MAX(E1.SD) FROM E1
WHERE E1.a = EPD.a AND E1.b = EPD.b AND
E1.SD <= T.WD)
end
however T-Sql does not seem to like my Case statement mixed into my From/join clauses.
Thanks,
Mark E. Johnson
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Aug 31, 2015
How can I change my T-SQL text editor from text sensitive to text insensitive?
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May 27, 2015
Is there a way of improving the SUM statements below? When I run the query without them it's very fast but with them it takes ages
SELECT
r.dbPatID, p.dbPatFirstName, p.dbPatLastName, r.dbstatusdesc, r.dbAddDate, r.LastName, r.dbStaffLastName
, SUM(CASE WHEN t.LedgerAmount > 0 AND t.LedgerType !=29 AND t.LedgerType !=30 AND t.LedgerType != 31 AND t.LedgerType != 1 OR t.LedgerType = 16 THEN t.LedgerAmount ELSE 0.00 END) AS Charges,
SUM(CASE WHEN t.LedgerAmount < 0 AND t.LedgerType != 1 AND t.LedgerType != 16 AND t.LedgerType != 45 OR t.LedgerType = 29 OR t.LedgerType = 30 OR t.LedgerType = 31 THEN t.LedgerAmount ELSE 0.00 END) AS Payments,
[code].....
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Mar 1, 2006
I have two tables.One has approx 90,000 rows with a field .. let's call in BigInt (and itis defined as a bigint data type).I have a reference table, with approx 10,000,000 rows. In thisreference table, I have starting_bigint and ending_bigint fields. Iwant to pull out all of the reference data from the reference table forall 90,000 rows in the transaction table where the BigInt from thetransaction table is between the starting_bigint and ending_bigint inthe reference table.I have the join working now, but it is not as optimized as I wouldlike. It appears no matter what I do, the query does a full table scanon the 10,000,000 rows in the reference table.Sample codeSELECT ref.*, tran.bigintfrom transactiontable tranINNER JOIN referencetable ref on tran.bigint betweenref.starting_bigint and ending_bigintYes, all 3 of the fields are indexed. I even have a composite index onthe reference table with the starting_bigint and ending_bigint fieldsselected as the composite.Any help would be appreciated.Robert H. KershbergIT DirectorTax Credit CompanyJoin Bytes! or Join Bytes! or Join Bytes!
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Aug 13, 2014
i was tasked to created an UPDATE statement for 6 tables , i would like to update 4 columns within the 6 tables , they all contains the same column names. the table gets its information from the source table, however the data that is transferd to the 6 tables are sometimes incorrect , i need to write a UPDATE statement that will automatically correct the data. the Update statement should also contact a where clause
the columns are [No] , [Salesperson Code], [Country Code] and [Country Name]
i was thinking of doing
Update [tablename]
SET [No] =
CASE
WHEN [No] ='AF01' THEN 'Country Code' = 'ZA7' AND 'Country Name' = 'South Africa'
ELSE 'Null'
END
What is the best way to script this
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Nov 13, 2015
This website describes how Merge statements should be optimized by the use of indexes on the target?source tables: [URL]..... It says that a clustered index should be created on the join column in the target and a unique covering index on the source table.
I have read in other articles that insert/delete/update statements perform worse on tables with clustered indexes as the leaf level pages will have to be reorganized.
Why in the case of Merge statement having a indexes actually improve the performance of insert/delete/update statements?
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Sep 21, 2015
I'm trying to get a result set without the NULLs. Here is the code I'm using. I'd like the results to look like:
17285204 90471 090471
17285204 90715 090715
17285204 99396 099396
17285204 99420 099420
17285204 90471 090471
17285204 NULL G0444
create table #Test
(
AppNum varchar(10),
CPT varchar(10),
src char(1)
)
insert into #Test(AppNum, CPT, src) values('17285204','090471','b')
[Code] ...
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Mar 1, 2015
I have a question on date manipulation functions and CASE statements
My sql is passed the following parameter's and performs a select using a manipulation on these date param's to get a start and end date range depending on the conditions;-
monthColHeader = eg 'Feb 2015'
defaultStartDate and defaultEndDate
filterStartDate and filterEndDate.
These are my conditions;-
if defaultStart and End = filterStart and End use monthColHeader for the date range
if defaultStart and End != filetrStart and End AND the month/year of filterStart and filterEnd match then use the filterStart & End month/Year with the monthColHeader to get the date range
if defaultStart and End != filetrStart and End AND the month/year of filterStart and filterEnd DON't match use filterStart Day and monthColHeader for our start date and monthColHeader for our end date.
When I say use monthColHeader I mean like this;-
(r.dbAddDate >= (CAST('@Request.monthColHeader ~' AS DATETIME)) AND r.dbAddDate < DATEADD(mm,1,'@Request.monthColHeader ~'))
This sql works for converting say 'Feb 2015' to '2015-02-01' & '2015-02-28'....
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Oct 29, 2015
The below would work if all of the values in A.Value were numbers but they are not. So I need to restrict the view to only look at the following measures but still show all the other row.
WHERE [Measure] IN ('RTT-01','RTT-04','RTT-07')
SELECT
M.[Description]
,A.*
,M.Threshold
,M.[Threshold Direction]
[Code] ....
Is there any way that I can create a select statement in the case when to only look for them measures that I know contain numbers?
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Jan 29, 2015
I am new in SQL and i need do a query where I need sum values from 2 tables, when i do it the Sum values are not correct. this is my query
SELECT D.Line AS Line, D.ProductionLine AS ProductionLine, D.Shift AS Shift, SUM(CAST(D.DownTime AS INT)) AS DownTime,
R.Category, SUM(Cast(R.Downtime AS INT)) AS AssignedDowntime,
CONVERT(VARCHAR(10), D.DatePacked,101) AS DatePacked
FROM Production.DownTimeReason R
left JOIN Production.DownTimeHistory D
[Code] .....
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Mar 23, 2015
I have Two tables @master and @child
Master Table :
MasterID EntryNumber BranchId IsstockIn
1 1 1 1
2 1 1 0
Child Table:
CEntryNumber CBranchID EntryQty
1 1 10
1 1 20
1 1 -5
1 1 -4
My Query:
Select SEC.EntryQty from Item.StockEntryChild SEC
where SEC.CEntryNo =
(
select SEM.EntryNumber from item.StockEntryMaster SEM
where SEC.CBranchID=SEM.BranchID and SEC.CEntryNo=SEM.EntryNumber and SEM.MasterID=1 and SEM.isStockIn=1
)
My Result:
EntryQty
10
20
-5
-4
Expected Result:
10
20
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Jul 13, 2015
I am looking for a query where in I can have a conditional statement within inner join after ON statement as shown below.
Declare @roleid int
select @roleid = roleid from Role where Name ='Admin'
select empid,empName,deptName from employee em
inner department dm on CASE when @roleid>0 then 1=dm.RoleId else em.RoleId=dm.RoleId end
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Nov 5, 2007
I have a view where I'm using a series of conditions within a CASE statement to determine a numeric shipment status for a given row. In addition, I need to bring back the corresponding status text for that shipment status code.
Previously, I had been duplicating the CASE logic for both columns, like so:
Code Block...beginning of SQL view...
shipment_status =
CASE
[logic for condition 1]
THEN 1
WHEN [logic for condition 2]
THEN 2
WHEN [logic for condition 3]
THEN 3
WHEN [logic for condition 4]
THEN 4
ELSE 0
END,
shipment_status_text =
CASE
[logic for condition 1]
THEN 'Condition 1 text'
WHEN [logic for condition 2]
THEN 'Condition 2 text'
WHEN [logic for condition 3]
THEN 'Condition 3 text'
WHEN [logic for condition 4]
THEN 'Condition 4 text'
ELSE 'Error'
END,
...remainder of SQL view...
This works, but the logic for each of the case conditions is rather long. I'd like to move away from this for easier code management, plus I imagine that this isn't the best performance-wise.
This is what I'd like to do:
Code Block
...beginning of SQL view...
shipment_status =
CASE
[logic for condition 1]
THEN 1
WHEN [logic for condition 2]
THEN 2
WHEN [logic for condition 3]
THEN 3
WHEN [logic for condition 4]
THEN 4
ELSE 0
END,
shipment_status_text =
CASE shipment_status
WHEN 1 THEN 'Condition 1 text'
WHEN 2 THEN 'Condition 2 text'
WHEN 3 THEN 'Condition 3 text'
WHEN 4 THEN 'Condition 4 text'
ELSE 'Error'
END,
...remainder of SQL view...
This runs as a query, however all of the rows now should "Error" as the value for shipment_status_text.
Is what I'm trying to do even currently possible in T-SQL? If not, do you have any other suggestions for how I can accomplish the same result?
Thanks,
Jason
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Aug 5, 2014
My table structure like below.
id date value1 value2
1 5-june-2104 Yes No
1 6-june-2014 No Yes
2 5-june-2104 Yes Yes
Want to calculate yes count on any day for same id
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Jan 25, 2011
I have a XML data passed on to the stored proc in the following format, and within the stored proc I am accessing the data of xml using the nodes() method
Here is an example of what i am doing
DECLARE @Participants XML
SET @Participants = '<ArrayOfEmployees xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<Employees EmpID="1" EmpName="abcd" />
<Employees EmpID="2" EmpName="efgh" />
</ArrayOfEmployees >'
SELECT Participants.Node.value('@EmpID', 'INT') AS EmployeeID,
Participants.Node.value('@EmpName', 'VARCHAR(50)') AS EmployeeName
FROM
@Participants.nodes('/ArrayOfEmployees /Employees ') Participants (Node)
the above query produces the following result
EmployeeID EmployeeName
--------------- -----------
1 abcd
2 efgh
How do I join the data coming out from the above query with another table in the database, for example Employee in this case
i.e. somewhat like this (note the following query does not perform the join correctly)
SELECT Participants.Node.value('@EmpID', 'INT') AS EmployeeID,
Participants.Node.value('@EmpName', 'VARCHAR(50)') AS EmployeeName
FROM
@Participants.nodes('/ArrayOfEmployees /Employees ') Participants (Node)
INNER JOIN
Employee EMP ON EmployeeID = EMP .EmployeeID
My desired output after the join would be
EmployeeID EmployeeName Email Home Address
--------------- ----------- --------------- -----------
1 abcd abcd@abcd.com New York
2 efgh efgh@efgh.com Austin
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Mar 24, 2015
I have this sql....
Select
DISTINCT p.dbPatID, p.dbpatfirstname, p.dbPatLastName,
s.dbSchTypeCnt as SchDetailType, t.dbSchTypeCnt as SchTypeType,
ISNULL(r.dbStatusDesc, 'No Ref') AS dbStatusDesc,
ISNULL(t.dbSchTypeCode, 'No Ref') AS dbSchTypeCode,
ISNULL(t.dbSchTypeDesc, 'No Ref') AS dbSchTypeDesc,
[code]....
however, I only want the lastest a.dbPatApptTime and only when a.dbPFStatus = 1 and a.ClientRef = 'EPS'
So the stand alone sql could be....
Select Top(1) dbPatApptTime as LastVisitDate, dbSchTypeDesc as LastVisitDesc
from appointments
where dbPFStatus = 1 and clientref = 'EPS'
order by dbPatApptTime desc
I'm just not sure how to incorporate that into my sql or whether there is a better way,
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Apr 25, 2015
I'm creating a sql stored procedure inside this proc it returns some information about the user, i.e location, logged in, last logged in, etc I need to join this on to the photos table and return the photo which has been set as the profile picture, if it hasn't been set then return the first top 1 if that makes sense?
The user has the option to upload photos so there might be no photos for a particular user, which I believe I can fix by using a left join
My photos table is constructed as follows:
CREATE TABLE [User].[User_Photos](
[Id] [bigint] IDENTITY(1,1) NOT NULL,
[UserId] [bigint] NOT NULL,
[PhotoId] [varchar](100) NOT NULL,
[IsProfilePic] [bit] NULL,
[Code] ....
Currently as it stands the proc runs but it doesn't return a particular user because they have uploaded a photo so I need to some how tweak the above to return null if a photo isn't present which is where I'm stuck.
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Jul 3, 2015
I have 3 tables as per following:
orddet
OrderProductQtyOrd
1 Item1 20
2 Item1 10
3 Item2 10
4 Item1 5
4 Item2 5
ordhead
OrderDate
110/06/2015
205/07/2015
307/06/2015
415/08/2015
product
ProductdescMinQty
Item1This is 110
Item2This is 220
I want to pull only the 1 line for minqty for an item as follows
OrderProductQtyOrddate minqty
1 Item1 20 10/06/2015 10
2 Item1 10 05/07/2015
3 Item2 10 07/06/2015 20
4 Item1 5 15/08/2015
4 Item2 5 15/08/2015
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Jul 15, 2015
I have two queries from two different tables ex ABC and BCD. For table ABC, according to my query, I got 11 records ; for table BCD I only got 9 records.
Bottom line: I would like to see only 11 records from Table ABC including certain data from table BCD after I joined this two tables.
However, no matter what I did I always got 99 records when I joined.
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Jul 30, 2015
I have a query which wants to union join the data. no matter how many times I tried, I got an error. How to change my union query?
select distinct b.lev5 AS "LEVEL 1",b.lev5NAME, C.lev7 "FUND", C.lev7NAME,round (sum(a.data),2) AS AMOUNT
(Select distinct b.lev5
from bf_data a
inner join bf_orgn_cnsl_tbl b
on a.bf_orgn_cd = b.bf_orgn_cd
[Code] .....
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Oct 16, 2015
I have an inline query that I am trying to convert it into JOIN, results are not coming out the same:
Original query:
SELECT distinct
(select count (distinct LoanID) FROM Q_C_Main_Sub1 WHERE DAY(LastWorked) = DAY(GETDATE()) and MONTH(LastWorked) = MONTH(GETDATE()) and YEAR(LastWorked) = YEAR(GETDATE()) and PrimStat = '1' and Collector = '3') As DcountMy query:
[code]....
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Sep 15, 2015
The below code returns a NULL for all the Differential backups. I am trying to return the word Differential when there is a NULL because I can tell from when the NULLs occur that those are my differential backups. How can I get the result I want?
SELECT
CONVERT(CHAR(100), SERVERPROPERTY('Servername')) AS Server,
msdb.dbo.backupset.database_name,
msdb.dbo.backupset.backup_start_date,
msdb.dbo.backupset.backup_finish_date,
CASE
WHEN msdb..backupset.type = 'D' THEN 'Database'
[Code] .....
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Aug 27, 2012
Can the collation used by SSIS be changed or influenced during install or run time? We have found that our databases, that use a mandatory "LATIN1_GENERAL_BIN", have incorrect SSIS Merge Join output. Changing our database collation in testing didn't make a difference. What matters is the data. Which Windows collation is SSIS using?
Example Data:
FIRSTNAME
FIRSTNAME
FIRSTS-A-NAME
FIRSTS_A_NAME
FIRST_NAME
FIRST_NAME
FIRSTname
FIRSTname
FIRS_NAME
put in a Sort task before the Merge Join task as setting advanced properties isn't enough (as described by Eric Johnson here --> [URL] ......
We are using 64-bit SQL Server 2008 R2 w/ SP1 in Windows Server 2008 R2 ENT w/ SP1.
UPDATE from ETL team: Explicitly ordering the source with "COLLATE Latin1_General_CS_AS" seems to have the same effect as using a separate sort task. We don't feel that we can rely on our findings, however, unless we have documentation that this collation is what is behind SSIS.
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Jun 20, 2015
Refer to my query thread on msdn SQL site, how I can achieve the result.
[URL] .....
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Jul 22, 2015
I have an intermittent issue where some remote PC's occasionally fail to execute select queries that have a join or return multiple result sets, however simple one table select queries continue to work okay. When it does happen the PC's needs to be rebooted to get to work again. This may only happen some PC's while others continue to work away okay.
I am using a VB6 application and ADO to connect to the database and the error message I get is a General Network Error, Server Not Found when it fails to execute the query. I have ran SQL Profiler on the server and while simple select queries continue to run away okay, a query a join does not even seem to show up in the profiler. The program has been working fine for 15 years with 1000's of users and has only now become an issue on one site for a number of users. Have tried moving the database to a different server and swapping network cards on the local PC's but can't seem to find the cause. The processor and the memory don't seem to be under load, but I am not sure if there is something else in SQL that is causing it to hang under certain conditions.
There have been network analysts experts in to run scans on the network, but I have not had the results of this back yet. Other applications do not seem to be affected so if this analysis does not show up anything.
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Mar 9, 2015
I have two servers (lets call them sA and sB) connected from sA -> sB via a linked server (i.e. sA pulls data across from sB).
I'm building a temp table full of stock symbols on sA, and then I need to update some values on sA using content on sB. The tables on sB are very large (about 500m rows) so I don't want to pull even close to everything across the linked server. Ordinarily I'd do this by joining to the linked server table, but the target table needs to have nolock on it due to their high use.
update t
set someValue = s.SomeValue
from #myTab t
inner join lnk_sB.xref.dbo.Symbols s with (nolock)
on t.id = s.id
From reading around I gather that nolock doesn't work across linked servers. It was noted in another SSC article that you could use nolock by using an OPENQUERY, but then I can't join to my local temp table, and I end up pulling all .5B rows across the linked server.
Is there some way I can limit the content on sB by my temp table on sA but still use nolock?
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Feb 4, 2014
Below is the scenario which I have currently in my query. I need to write this query without any hardcode values , so that it will work til n number of years without modifications.
Startdate =
CASE WHEN
Trandate between '06-04-2013' and '05-04-2014' then '06-04-2013'
Trandate between '06-04-2012' and '05-04-2013' then '06-04-2012'
Trandate between '06-04-2011' and '05-04-2012' then '06-04-2011'
Trandate between '06-04-2010' and '05-04-2011' then '06-04-2010'
Trandate between '06-04-2009' and '05-04-2010' then '06-04-2009'
Trandate between '06-04-2008' and '05-04-2019' then '06-04-2008'
END
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