I have a select query as below:
SELECT COL1, COL2, COL3
FROM
(
SELECT A.COL1, B.COL2, A.COL3
FROM
SCHEMA1.TAB1 A, SCHEMA2.TAB2 B
WHERE
A.SOMECOL = B.SOMECOL
) TEMP
WHERE NOT EXISTS
(
SELECT 1 FROM SCHEMA3.TAB3 C WHERE C.COL3 = TEMP.COL3
)
Now in my current code setup, I am running the SELECT first to get the results and then in the next step, I am updating table SCHEMA3.TAB3 with below update query by iterating through the result set:
UPDATE SCHEMA3.TAB3 SET COL1=?, COL2=? WHERE COL3=?
Where the three parameter values are coming from the result of above SELECT.
But, now I want to convert this two steps of selecting and updating into a single update statement with a sub select and do away completely with parameter setting.
How can I do it ?
Something seems to be wrong with your question.
You are updating where TAB3.COL3 = TAB1.COL3, but in the original SELECT to obtain the values you have eliminated the rows where TAB3.COL3 = TAB1.COL3.
Related
Is it possible to SELECT value of two or more columns with one shot of CASE statement? I mean instead of:
select
ColumnA = case when CheckColumn='condition' then 'result1' end
,ColumnB = case when CheckColumn='condition' then 'result2' end
Something like:
select case when CheckColumn='condition' then ColumnA='result1', ColumnB='result2' end
UPDATE
Just the same as we can do with the UPDATE statement:
update CTE
set ColumnA='result1', ColumnB='result2'
where CheckColumn='condition'
It is not possible with CASE expression.
For every column you need new CASE
It is not possible, but you could use a table value constructor as a work around to this, to store each value for columna and columnb against your check column:
SELECT t.CheckColumn,
v.ColumnA,
v.ColumnB
FROM dbo.YourTable AS t
LEFT JOIN
(VALUES
('Condition1', 'Result1', 'Result2'),
('Condition2', 'Result3', 'Result4'),
('Condition3', 'Result5', 'Result6')
) AS v (CheckColumn, ColumnA, ColumnB)
ON v.CheckColumn = t.CheckColumn;
If you have more complex conditions, then you can still apply this logic, but just use a pseudo-result for the join:
SELECT t.CheckColumn,
v.ColumnA,
v.ColumnB
FROM dbo.YourTable AS t
LEFT JOIN
(VALUES
(1, 'Result1', 'Result2'),
(2, 'Result3', 'Result4'),
(3, 'Result5', 'Result6')
) AS v (ConditionID, ColumnA, ColumnB)
ON v.ConditionID = CASE WHEN <some long expression> THEN 1
WHEN <some other long expression> THEN 2
ELSE 3
END;
The equivalent select to the update is:
select 'result1', 'result2'
. . .
where CheckColumn = 'condition';
Your select is different because it produces NULL values. There is an arcane way you can essentially do this with outer apply:
select t2.*
from . . . outer apply
(select t.*
from (select 'result1' as col1, 'result2' as col2) t
where CheckColumn = 'condition'
) t2;
This will return NULL values when there is no match. And, you can have as many columns as you would like.
What I understood from your question is that you want to update multiple columns if certain condition is true.
For such situation you have to use MERGE statements.
Example of using MERGE is as given on msdn here.
Code example:
-- MERGE statement for update.
USE [Database Name];
GO
MERGE Inventory ity
USING Order ord
ON ity.ProductID = ord.ProductID
WHEN MATCHED THEN
UPDATE
SET ity.Quantity = ity.Quantity - ord.Quantity;
More MERGE statement example here.
You could solve this maybe with a CTE or a CROSS APPLY, somehting like
DECLARE #tbl2 TABLE(inx INT, val1 VARCHAR(10),val2 VARCHAR(10));
INSERT INTO #tbl2 VALUES(1,'value1a','value1b'),(2,'value2a','value2b'),(3,'value2a','value2b');
UPDATE yourTable SET col1=subTable.val1,col2=subTable.val2
FROM yourTable
CROSS APPLY(
SELECT val1,val2
FROM #tbl2
WHERE inx=1 --YourCondition
) AS subTable
I am writing down a view in SQL server (DWH) and the use case pseudo code is:
-- Do some calculation and generate #Temp1
-- ... contains other selects
-- Select statement 1
SELECT * FROM Foo
JOIN #Temp1 tmp on tmp.ID = Foo.ID
WHERE Foo.Deleted = 1
-- Do some calculation and generate #Temp2
-- ... contains other selects
-- Select statement 2
SELECT * FROM Foo
JOIN #Temp2 tmp on tmp.ID = Foo.ID
WHERE Foo.Deleted = 1
The result of the view should be:
Select Statement 1
UNION
Select Statement 2
The intended behavior is the same as the yield returnin C#. Is there a way to tell the view which SELECT statements are actually part of the result and which are not? since the small calculations preceding what I need also contain selects.
Thank you!
Yield return in C# returns rows one at a time as they appear in some underlying function. This concept does not exist in SQL statements. SQl is set-based, returning the entire result set, conceptually as a unit. (That said, sometimes queries run slowly and you will see rows returned slowly or in batches.)
You can control the number of rows being returns using TOP (in SQL Server). You can select particular rows to be returned using WHERE statements. However, you cannot specify a UNION statement that conditionally returns rows from some components but not others.
The closest you may be able to come is something like:
if UseTable1Only = 'Y'
select *
from Table1
else if UseTable2Only = 'Y'
select *
from Table2
else
select *
from table1
union
select *
from table2
You can do something similar using dynamic SQL, by constructing the statement as a string and then executing it.
I found a better work around. It might be helpful for someone else. It is actually to include all the calculation inside WITH statements instead of doing them in the view core:
WITH Temp1 (ID)
AS
(
-- Do some calculation and generate #Temp1
-- ... contains other selects
)
, Temp2 (ID)
AS
(
-- Do some calculation and generate #Temp2
-- ... contains other selects
)
-- Select statement 1
SELECT * FROM Foo
JOIN Temp1 tmp on tmp.ID = Foo.ID
WHERE Foo.Deleted = 1
UNION
-- Select statement 2
SELECT * FROM Foo
JOIN Temp2 tmp on tmp.ID = Foo.ID
WHERE Foo.Deleted = 1
The result will be of course the UNION of all the outiside SELECT statements.
I have a SQL select statement which is comparing two tables. I am getting the values where the rows are the same. Now I have got this in the procedure I need to add these into a new table (coftReconciliationMatches). The table has all the same columns but one additional one 'MatchOrNoMatch'. I need to pass through the values of the row that are matched and also need to pass through 'Match' to the column 'MatchOrNoMatch'
This is the current part of the SQL script I have;
SELECT *
FROM dbo.coftReconciliationFileInfo AS a
WHERE EXISTS (SELECT *
FROM dbo.coftPreReconciliationInfo AS b
WHERE a.Rec_PK = b.Rec_PK
AND a.ExtRef1 = b.ExtRef1
AND a.SedolRef = b.SedolRef
AND a.ValLatest = b.ValLatest
AND a.Totunits = b.Totunits
AND a.FundsOrCash = b.FundsOrCash )
When comparing a lot of columns, the SELECT INTERSECT and SELECT EXCEPT commands can save you a lot of effort:
INSERT dbo.coftReconcilliationMatches
(Rec_PK, ExtRef1, SedolRef, ValLatest, Totunits, FundsOrCash, MatchOrNoMatch)
select Rec_PK, ExtRef1, SedolRef, ValLatest, Totunits, FundsOrCash, 'Match'
from dbo.coftReconciliationFileInfo
intersect select Rec_PK, ExtRef1, SedolRef, ValLatest, Totunits, FundsOrCash, 'Match'
from dbo.coftPreReconciliationFileInfo
(Check for typos!)
If you are creating the table on the fly (something I wouldn't recommend doing), you'd use SELECT INTO.
INSERT INTO [table] ([col1], [col2]) SELECT colx, ...
Use Select Into for this. See here http://www.w3schools.com/sql/sql_select_into.asp
Try something like:
INSERT INTO <your table> (<list of columns>)
SELECT <list of columns from select>, '<the additional column>' FROM dbo.coftReconciliationFileInfo AS a
WHERE EXISTS(SELECT * FROM dbo.coftPreReconciliationInfo AS b
WHERE a.Rec_PK = b.Rec_PK AND a.ExtRef1 = b.ExtRef1 AND a.SedolRef = b.SedolRef AND a.ValLatest = b.ValLatest AND a.Totunits = b.Totunits AND a.FundsOrCash = b.FundsOrCash )
also see http://www.1keydata.com/sql/sqlinsert.html
you need to do:
INSERT INTO Table (column1, column2..)
(SELECT column1, column2 ....
FROM dbo.coftReconciliationFileInfo AS a
WHERE EXISTS (SELECT *
FROM dbo.coftPreReconciliationInfo AS b
WHERE a.Rec_PK = b.Rec_PK
AND a.ExtRef1 = b.ExtRef1
AND a.SedolRef = b.SedolRef
AND a.ValLatest = b.ValLatest
AND a.Totunits = b.Totunits
AND a.FundsOrCash = b.FundsOrCash ))
I have a sql query that I run against a sql server database eg.
SELECT * FROM MyTable WHERE Id = 2
This may return a number of records or may return none. If it returns none, I would like to alter my sql query to return a default record, is this possible and if so, how? If records are returned, the default record should not be returned. I cannot update the data so will need to alter the sql query for this.
Another way (you would get an empty initial rowset returned);
SELECT * FROM MyTable WHERE Id = 2
IF (##ROWCOUNT = 0)
SELECT ...
SELECT TOP 1 * FROM (
SELECT ID,1 as Flag FROM MyTable WHERE Id = 2
UNION ALL
SELECT 1,2
) qry
ORDER BY qry.Flag ASC
You can have a look to this post. It is similar to what you are asking
Return a value if no rows are found SQL
I hope that it can guide you to the correct path.
if not exists (SELECT top 1 * FROM mytable WHERE id = 2)
select * from mytable where id= 'whatever_the_default_id_is'
else
select * from mytable where id = 2
If you have to return whole rows of data (and not just a single column) and you have to create a single SQL query then do this:
Left join actual table to defaults single-row table
select
coalesce(a.col1, d.col1) as col1,
coalesce(a.col2, d.col2) as col2,
...
from (
-- your defaults record
select
default1 as col1,
default2 as col2,
...) as d
left join actual as a
on ((1 = 1) /* or any actual table "where" conditions */)
The query need to return the same number of fields, so you shouldn't do a SELECT * FROM but a SELECT value FROM if you want to return a default value.
With that in mind
SELECT value FROM MyTable WHERE Id = 2
UNION
SELECT CASE (SELECT count(*) FROM MyTable WHERE Id = 2)
WHEN 0 THEN 'defaultvalue'
END
How can I retrieve the row just inserted?
INSERT INTO LETTRE_VOIT
select rsVoit.NOID, NO_ORDRE, rsOrdre.CODE_DEST, rsOrdre.MODAL_MODE, rsOrdre.MODAL_PORT,
CASE rsOrdre.MODAL_PORT
WHEN 'false' THEN 'D'
ELSE 'P'
END,
rsOrdre.LIVRS_EXPRS,
CASE rsOrdre.LIVRS_EXPRS
WHEN 'false' THEN 'L'
ELSE 'E'
END,
rsOrdre.ENLEV_UNITE, LIBELLE, NBR_COLIS,POID,ENLEV_CREMB,ENLEV_DECL
from ORDRE rsOrdre
inner join
(
select CODE_DEST,MODAL_MODE, MODAL_PORT, LIVRS_EXPRS,ENLEV_UNITE, ROW_NUMBER() over (order by CODE_DEST) as NOID
from ORDRE
group by CODE_DEST,MODAL_MODE,MODAL_PORT,LIVRS_EXPRS,ENLEV_UNITE
) rsVoit on rsVoit.CODE_DEST = rsOrdre.CODE_DEST and rsVoit.MODAL_MODE = rsOrdre.MODAL_MODE
and rsVoit.MODAL_PORT = rsOrdre.MODAL_PORT and rsVoit.LIVRS_EXPRS = rsOrdre.LIVRS_EXPRS
and rsVoit.ENLEV_UNITE = rsOrdre.ENLEV_UNITE
LEFT JOIN T_UNITE ON rsOrdre.ENLEV_UNITE = T_UNITE.NOID
WHERE (STATUT_ORDRE = 3) AND IS_PRINT = 'false' AND (TRANSPORTEUR IN (SELECT ParsedString From dbo.ParseStringList(#Trans)))
order by rsVoit.NOID, NO_ORDRE
SELECT * FROM LETTRE_VOIT WHERE ???
For example:
I inserted 2, it return 2
and then I inserted 3, I want return 3 instead of 5 rows.
Thanks in advance.
Stev
PS: May be I need to use a stored procedure ?
I'm not 100% sure what exactly you want back.... but SQL Server has an OUTPUT clause that can output stuff from INSERT and UPDATE and DELETE statements:
INSERT INTO dbo.YourTable(col1, col2, ..., colN)
OUTPUT Inserted.Col1, Inserted.IDCol, Inserted.Col17
VALUES(val1, val2, ...., valN)
Here, you're inserting values and the inserted values for the IDCol (e.g. an INT IDENTITY column), Col1 and Col17.
If just getting back the results into your grid in Mgmt Studio is good enough - then use the OUTPUT clause! Read more about the OUTPUT clause on Books Online
If you are using SQL Server
And you know how many row inserted then go through
SELECT top 2 * FROM LETTRE_VOIT order by primaryKeyId desc
put the number of row inserted at place of 2.
It may be help you, If you know the number of inserted rows, and then you can provide the numbers with top keyword
How about saving the records in a variable before inserting them or adding a date field and retrieve them by date?