I have this SQL Query,
select * from (select * from .......) as a
where 1 = case when CountOfInnerSelect = 1 Then 1 ELSE ............
Is it possible I can get Count of inner select inside the outer SELECT?
Your WHERE Clause does not make much sense as it is applied like a filter here. (ie; similar to WHERE myCount = 1)
SELECT * FROM
(SELECT c1,c2,c3,..,Cn,COUNT(*) AS myCount
FROM YourTable
GROUP BY c1,c2,c3,..,Cn
) A
WHERE 1 = CASE myCount WHEN 1 THEN 1 ELSE... END
Yes :
select * from (select count(0) as cnt from .......) as a
where 1 = case when a.cnt = 1 Then 1 ELSE ............
Related
I trying to create a SQL query with a CASE WHEN EXISTS clause in SQL Server. I assume I am doing something wrong as when I run the SELECT * FROM [Christmas_Sale] it takes forever for SQL to load the code.
CREATE VIEW [Christmas_Sale]
AS
SELECT
C.*,
CASE
WHEN EXISTS (SELECT S.Sale_Date
FROM [Christmas_Sale] s
WHERE C.ID = S.ID)
THEN 0
ELSE 1
END AS ChristmasSale
FROM
[Customer_Detail] C ;
I'm trying to write a sub select which I need to return a 1 if Sale_Date= 1 and 0 for anything else.
The syntax of your query looks ok. But since your stated:
I'm trying to write a sub select which I need to return a 1 if Sale_Date= 1 and 0 for anything else.
... Then you could rephrase your query by adding one more condition in the WHERE clause of the subquery:
CREATE VIEW [Christmas_Sale]AS
SELECT
C.*,
CASE WHEN EXISTS (
SELECT 1
FROM [Christmas_Sale] s
WHERE C.ID = S.ID and S.Sale_Date = 1
) THEN 0 ELSE 1 END AS ChristmasSale
FROM [Customer_Detail] C ;
If a record exists in [Christmas_Sale] with the corresponding ID and Sale_Date = 1, then ChristmasSale will have value 1, else it will display 0.
This query looks correct:
CREATE VIEW [Christmas_Sale] AS
SELECT C.*,
(CASE WHEN EXISTS (SELECT 1
FROM [Christmas_Sale] s
WHERE C.ID = S.ID
)
THEN 0 ELSE 1
END) AS ChristmasSale
FROM [Customer_Detail] C ;
If performance is an issue, you want an index on Christmas_Sale(ID).
Note that the SELECT S.Sale_Date in the subquery is meaningless, because EXISTS checks for rows not columns. Hence, I replaced it with the simpler 1.
I have a Questions group table like follows:
ID, NAME, DESCRIPTION, VERSION_ID
Versions table columns are:
ID, NUMBER, VERSION_STATE
VERSION_STATE is an enumerated that can be 0, 1 or 2.
I need to select all questions group that its version has thevVERSION_STATE 0 or 1, but if there is a questions group with a VERSION_STATE = 0 I don't have to return the questions group with the VERSION_STATE = 1.
The simplest approach is:
SELECT distinct QG.id FROM healthsafety.hs_questions_group QG
LEFT OUTER JOIN (SELECT * FROM healthsafety.hs_version) VERSION
ON QG.VERSION_ID = VERSION.ID
WHERE
VERSION.VERSION_STATE=0
OR VERSION.VERSION_STATE=1
The problem is that this query returns all questions group with the VERSION_STATE 0 or 1. If I remove the or clause, and there are not questions groups with VERSION_STATE = 0, I need to return the questions groups with VERSION_STATE = 1.
I think that I need an if else or case statement but I am stucked. Any Idea?
Note that I have to implement this using criteria, so I need to use the simplest solution.
SELECT *
FROM (
SELECT OG.ID,OG.NAME,OG.DESCRIPTION,VERSION.ID,VERSION.NUMBER,VERSION.VERSION_STATE,ROW_NUMBER()OVER(PARTITION BY OG.ID ORDER BY VERSION.VERSION_STATE ASC) as INDICATOR
FROM healthsafety.hs_questions_group QG
LEFT OUTER JOIN
(SELECT * FROM healthsafety.hs_version) VERSION
ON QG.VERSION_ID = VERSION.ID
WHERE
VERSION.VERSION_STATE=0
OR VERSION.VERSION_STATE=1
) AS ABC
WHERE (ABC.VERSION_STATE = 0 and ABC.INDICATOR = 1)
OR (ABC.VERSION_STATE = 1 and ABC.INDICATOR = 1)
Using a common table expression and a union all where the second query uses not exists() to only return rows where version_state=1 when rows with version_state=0 do not exist.
;with cte as (
select qg.id, v.version_state
from healthsafety.hs_questions_group qg
inner join healthsafety.hs_version version v
on qg.version_id = v.id
where v.version_state in (0,1)
)
select id
from cte
where version_state = 0
union all
select qg.id
from cte
where version_state = 1
and not exists (
select 1
from cte
where version_state = 0
)
Going to use this query as a subquery, the problem is it returns many rows of duplicates. Tried to use COUNT() instead of exists, but it still returns a multiple answer.
Every table can only contain one record of superRef.
The below query I`ll use in SELECT col_a, [the CASE] From MyTable
SELECT CASE
WHEN
EXISTS (SELECT 1 FROM A WHERE
A_superRef = myTable.sysno AND A_specAttr = 'value')
THEN 3
WHEN EXISTS (SELECT 1 FROM B
INNER JOIN С ON С_ReferenceForB = B_sysNo WHERE C_superRef = myTable.sysno AND b_type = 2)
THEN 2
ELSE (SELECT C_intType FROM C
WHERE C_superRef = myTable.sysno)
END
FROM A, B, C
result:
3
3
3
3
3
3...
What if you did this? Because Im guessing you are getting an implicit full outer join A X B X C then running the case statement for each row in that result set.
SELECT CASE
WHEN
EXISTS (SELECT 1 FROM A WHERE
A_superRef = 1000001838012)
THEN 3
WHEN EXISTS (SELECT 1 FROM B
INNER JOIN С ON С_ReferenceForB = B_sysNo AND C_superRef = 1000001838012 )
THEN 2
ELSE (SELECT C_type FROM C
WHERE C_superRef = 1000001838012)
END
FROM ( SELECT COUNT(*) FROM A ) --This is a hack but should work in ANSI sql.
--Your milage my vary with different RDBMS flavors.
DUAL is what I needed, thanks to Thorsten Kettner
SELECT CASE
WHEN
EXISTS (SELECT 1 FROM A WHERE
A_superRef = 1000001838012)
THEN 3
WHEN EXISTS (SELECT 1 FROM B
INNER JOIN С ON С_ReferenceForB = B_sysNo AND C_superRef = 1000001838012 )
THEN 2
ELSE (SELECT C_type FROM C
WHERE C_superRef = 1000001838012)
END
FROM DUAL
I have an existing sql query that I'd like to apply to every record returned from a "distinct" query.
I guess something like looping through each of the returned records, storing it as a string, and using that value in the other query. How would I go about this?
sudo queries:
Select ...
for each record returned as X,
Select ... etc ... where ... LIKE X
Edit:
not sure how to make it clearer, but I know I'm probably not making it obvious. I'll try:
The distinct will return a single column, with many records. I need to apply each value to the second sql query.
So like.. Select X and Y, but Y is returned from the 2nd query I have, using X
Edit2:
If the distinct select returns
1
2
3
4
And the second query returns a single record "A" when the where clause looks like ... = '1', "B" when the where clause looks like ... = '2', "C" when the where clause looks like ... = '3', and C when the where clause looks like ... = '4'
Then I'd like my final output to look like
1 | A
2 | B
3 | C
4 | C
Edit 3:
first query:
SELECT DISTINCT [user_id] from dbo.sap_empl_subset
second query:
SELECT [name_pref_mixed]
FROM dbo.sap_empl_subset AS E
WHERE E.sap_position_no IN
(SELECT P.sap_position_no
FROM dbo.sap_position AS P
WHERE (LTRIM(RTRIM(P.sap_position_desc)) LIKE '%[VICE ]PRESIDENT%')
OR (LTRIM(RTRIM(P.sap_position_desc)) LIKE 'CHIEF%'))
AND E.sap_org_code =
(SELECT
CASE
WHEN S.sap_org_code_level2 = 0 THEN S.sap_org_code
WHEN S.sap_org_code_level3 = 0 THEN S.sap_org_code_level1
ELSE S.sap_org_code_level2
END
FROM dbo.sap_org_structure AS S
WHERE S.sap_org_code =
(SELECT E1.sap_org_code
FROM dbo.sap_empl_subset AS E1
WHERE E1.[user_id] = '<each item from first query needs applied here>'))
SELECT *
FROM (
SELECT DISTINCT value
FROM mytable
) x
JOIN othertable y
ON y.value LIKE '%' || x.value || '%'
Update:
If you first query is
SELECT my_x
FROM mytable
WHERE my_y = '…'
and the second one is
SELECT other_z
FROM othertable
WHERE other_y = my_x
the you just need a join:
SELECT my_x, other_z
FROM mytable
JOIN othertable
ON other_y = my_x
WHERE my_y = '…'
It would be much more easy to answer if you just posted the queries.
Update 2:
Try this:
SELECT es.user_id, esp.name_pref_mixed
FROM sap_empl_subset es
JOIN sap_org_structure os
ON os.sap_org_code = es.sap_org_code
JOIN sap_empl_subset esс
ON esc.sap_org_code =
CASE
WHEN os.sap_org_code_level2 = 0 THEN os.sap_org_code
WHEN os.sap_org_code_level3 = 0 THEN os.sap_org_code_level1
ELSE os.sap_org_code_level2
END
WHERE esc.sap_position_no IN
(
SELECT sap_position_no
FROM sap_position sp
WHERE (LTRIM(RTRIM(sp.sap_position_desc)) LIKE '%[VICE ]PRESIDENT%')
OR (LTRIM(RTRIM(sp.sap_position_desc)) LIKE 'CHIEF%'))
)
DISTINCT seems to be redundant here. You have a condition in your second query:
WHERE S.sap_org_code =
(
SELECT E1.sap_org_code
FROM dbo.sap_empl_subset AS E1
WHERE E1.[user_id] = '<each item from first query needs applied here>')
)
which would throw an error if there were duplicates on sap_empl_subset.user_id
A join was not necessary to combine the two queries. All I needed was the nested select syntax as shown below, where the first line is the first query, and the first nested select is the second query. A join was not necessary.
SELECT Distinct U.[user_id] AS "User ID", (
SELECT [empl_last_name]
FROM dbo.sap_empl_subset AS E
WHERE E.sap_position_no IN
(SELECT P.sap_position_no
FROM dbo.sap_position AS P
WHERE (LTRIM(RTRIM(P.sap_position_desc)) LIKE '%[VICE ]PRESIDENT%')
OR (LTRIM(RTRIM(P.sap_position_desc)) LIKE '%CHIEF%')
OR (LTRIM(RTRIM(P.sap_position_desc)) LIKE '%[EXECUTIVE ]VP%')
)
AND E.sap_org_code =
(SELECT
CASE
WHEN S.sap_org_code_level2 = 0 THEN S.sap_org_code
WHEN S.sap_org_code_level3 = 0 THEN S.sap_org_code_level1
ELSE S.sap_org_code_level2
END
FROM dbo.sap_org_structure AS S
WHERE S.sap_org_code =
(SELECT E1.sap_org_code
FROM dbo.user_id AS E1
WHERE E1.[user_id] = U.[user_id]))) As "VP"
From dbo.user_id As U WHERE U.[user_id] <> ''
ORDER BY [User ID]
I have a Where Clause that checks the existence of rows in a subquery, but I only want to execute that check if a bit is set to 1. So for example:
Select * from Listing l
Where
l.IsDeleted=1
AND CASE WHEN #MustHasPicture = 1 THEN
(
EXISTS
(
SELECT NULL AS [EMPTY]
FROM [dbo].[ListingPictures] AS [lp]
INNER JOIN Listing l ON lp.ListingID=l.ID
)
)
ELSE 1 END = 1
This syntax is wrong, and I'm hoping someone can point me in the right direction. Thanks.
SELECT *
FROM Listing l
WHERE IsDeleted = 1
AND ( #MustHasPicture <> 1 OR
(#MustHasPicture = 1 AND l.id IN (
SELECT listingid
FROM ListingPictures
)
)
)
No need to do a case - if the first part of an and fails, the second part will not be performed.
select
*
from
Listing l
Where
l.IsDeleted = 1
and ((#MustHasPicture = 1 and exists (...)) or 1)
What about this one:
SELECT * FROM Listing l
WHERE l.IsDeleted = 1
AND (#MustHasPicture = 1
AND EXISTS(SELECT * FROM [dbo].[ListingPictures] AS [lp]
WHERE lp.ListingID = l.ID)
OR #MustHasPicture = 0)
But where does the Value #MustHasPicture come from?