given the following table definition
I have a query written as so:
select id,
(
case
when partial >= 2 and full >=2
then sum(partial+full)
when partial >=2
then partial
when full >= 2
then full
else 0
end
) counts
from Foo
What is the minimum number of checks that I have to do to ensure that the inner when clauses:
partial>=2 and full >=2 are not invoked twice. That is does the case when/then syntax treat everything as else ifs and not just straight ifs?
You can do
select id,
(
case when partial >= 2 then partial else 0 end +
case when full >= 2 then full else 0 end
) counts
from Foo
Sample SQL FIDDLE
Related
I have an SQL query joined on multiple tables (all INNER JOINS).
The below is an example of the query I am trying to run (the ? is to illustrate the position in which I presume the answer to my question will be rectified).
Case
(
SELECT Count(ID)
FROM CPD_Candidates cpdCan
WHERE
cpdCan.CandidateID = can.CandidateID
AND
(
cpdCan.DateEnded >= GETDATE()
OR
coalesce(cpdCan.DateEnded, '') = N'1-Jan-1900'
)
AND
cpdCan.Deleted <> 1
)
When ? > 0 then 'Bigger' else 'Equal or Smaller' End
)
The idea with the above is that instead of the ? the actual value I want to compare against would be Count(ID), if it's greater than 0 I want it to SELECT 'Bigger', otherwise it should SELECT 'Equal or Smaller'. So a more-accurate depiction of what I wish to run would be the below.
Case
(
SELECT Count(ID)
FROM CPD_Candidates cpdCan
WHERE
cpdCan.CandidateID = can.CandidateID
AND
(
cpdCan.DateEnded >= GETDATE()
OR
coalesce(cpdCan.DateEnded, '') = N'1-Jan-1900'
)
AND
cpdCan.Deleted <> 1
)
When
Count(cpdCan.ID) > 0 then 'Bigger' else 'Equal or Smaller' End
)
Of course there is a syntax error above but I am enquiring as to whether it is possible to compare like in the above SQL query structure but replacing Count(cpdCan.ID) > 0 with some other means to achieve that value & logic?
If this is un-achievable in SQL Server 2016 what other means would be a better solution to this XY?
I think that you mean:
case when
(
SELECT Count(ID)
FROM CPD_Candidates cpdCan
WHERE
cpdCan.CandidateID = can.CandidateID
AND (cpdCan.DateEnded >= GETDATE() OR coalesce(cpdCan.DateEnded, '') = N'1-Jan-1900')
AND cpdCan.Deleted <> 1
) > 0
then 'Bigger'
else 'Equal or Smaller'
End
I am having problem in part of my code anyway to do this
Only one expression can be specified in the select list when the subquery is not introduced with EXISTS. The update part is working but how to use insert into to calculate if a condition is not meant it will insert.
IF
/* CHECKLIST TO UPDATE*/
(NOT EXISTS
(SELECT *
FROM ENERGY.D_ENERGY_REFERENCE D_ENERGY_REFERENCE
,ENERGY.D_CHECK_LIST D_CHECK_LIST
WHERE D_ENERGY_REFERENCE.ID = D_CHECK_LIST.ID
AND D_ENERGY_REFERENCE.REFERENCE = 19051
)
)
BEGIN
INSERT INTO DB.D_ENERGY_REFERENCE(ID, REFERENCE_NO, REFERENCE,VALUE_INTEGER)
(SELECT ID,
(SELECT ISNULL(MAX(REFERENCE_NO), 0) + 1 FROM DB.D_ENERGY_REFERENCE),
19051, (SELECT D_CHECK_LIST.ID,
CASE
WHEN CAST(COUNT(CASE WHEN D_CHECK_LIST.EVALUATION NOT IN (0,1) THEN EVALUATION ELSE NULL END) AS FLOAT) = 0 THEN NULL
ELSE
(
CAST(COUNT(CASE WHEN D_CHECK_LIST.EVALUATION IN (2, 3, 50001, 50003, 50004, 50005, 50006, 50020, 50027, 50028) THEN EVALUATION ELSE NULL END) AS FLOAT)
/
CAST(COUNT(CASE WHEN D_CHECK_LIST.EVALUATION NOT IN (0,1) THEN EVALUATION ELSE NULL END) AS FLOAT)
) * 100
END FROM DB.D_CHECK_LIST
GROUP BY D_CHECK_LIST.ID)
FROM DB.D_ENERGY_REFERENCE D_ENERGY_REFERENCE
WHERE D_ENERGY_REFERENCE.ID = ID AND D_ENERGY_REFERENCE.REFERENCE = 19051
GROUP BY D_ENERGY_REFERENCE.ID
)
END
Can you please check this following part in the sub query of your script-
.......
19051,
(
SELECT
D_CHECK_LIST.ID, -- This is the column 1
CASE
WHEN -- Here you are generating column 2 in the sub query
......
)
Here you are selecting 2 column - one is "D_CHECK_LIST.ID" and other one is generation through CASE WHEN statement. I think you should SELECT any 1 column from those 2 column. If both are required, you can use separate Sub query for that.
The ERROR code "Only one expression can be specified in the select list when the subquery is not introduced with EXISTS" is self explanatory that you can not implement a Sub Query with more than 1 column selected unless the Sub Query is using inside EXISTS method.
My query is basic and look like this :
SELECT ID FROM Table WHERE CRIT1='a' AND CRIT2='b' AND CRIT3='c'
However it sometimes return no value. This is normal because there is no match in the table.
To help my users to find which criteria is too restrictive, I would like to find another query which tell me if it is because of clause CRIT1, CRIT2 or CRIT3 that I have no answer.
Currently, I've done it this way (using pseudo code) :
If ( SELECT ID FROM Table WHERE CRIT1='a' returns EOF )
Then WrongCriteria="CRIT1"
Elseif ( SELECT ID FROM Table WHERE CRIT1='a' AND CRIT2='b' returns EOF )
Then WrongCriteria="CRIT2"
Elseif ( SELECT ID FROM Table WHERE CRIT1='a' AND CRIT2='b' AND CRIT3='c' returns EOF )
Then WrongCriteria="CRIT3"
It works ... but there are several queries and each of them is very slow due to the poor network response time.
My question is thus : It is possible to do the above pseudo-code in one single SQL query?
You can combine three queries into one by using SUM on a conditional:
SELECT
SUM(CASE WHEN CRIT1='a' THEN 1 ELSE 0 END) as CRIT1
, SUM(CASE WHEN CRIT1='a' AND CRIT2='b' THEN 1 ELSE 0 END) as CRIT2
, SUM(CASE WHEN CRIT1='a' AND CRIT2='b' AND CRIT3='c' THEN 1 ELSE 0 END) as CRIT3
FROM MyTable
Zero in a column corresponds to the criterion being to restrictive.
Note that this is only a different implementation of your three queries, which "prioritizes" the criteria in a specific way (crit1 then crit2 then crit3). In theory, with three criteria you want to test all individual ones, plus three combinations of pairs, i.e get six counts for these conditions:
CRIT1='a'
CRIT2='b'
CRIT3='c'
CRIT1='a' && CRIT2='b'
CRIT1='a' && CRIT3='c'
CRIT2='b' && CRIT3='c'
The above six counts would give you a full picture of which criteria are too restrictive.
Yes it's possible to do this check in a single query using 'OR' operator.
I'm assuming it's only one condition which can be wrong at a time:
SELECT CASE WHEN CRIT1 <> 'a' THEN 'CRIT1'
WHEN CRIT2 <> 'b' THEN 'CRIT2'
WHEN CRIT3 <> 'c' THEN 'CRIT3' END AS WrongCriteria
FROM Table WHERE CRIT1<>'a' OR CRIT2<>'b' OR CRIT3<>'c'
To show all combinations of restrictions:
SELECT
COALESCE( 'Conditions:'
+ NULLIF(
( CASE WHEN CRIT1 <> 'a' THEN ' CRIT1' ELSE '' END )
+ ( CASE WHEN CRIT2 <> 'b' THEN ' CRIT2' ELSE '' END )
+ ( CASE WHEN CRIT3 <> 'c' THEN ' CRIT3' ELSE '' END ),
'' ),
'None' ) AS Restrictions
FROM MyTable
I am attempting to create a row called Flag that will keep a count of when Value is above 2. Later I will need to sum flag as a count.
I currently have:
CASE
WHEN Value > 2
THEN 1
ELSE 0
END AS 'Flag',
CASE
WHEN 'Flag' = 1
THEN 1
ELSE 0
END AS 'FollowedUpCorrectly'
I receive the error:
Conversion failed when converting the varchar value 'Flag' to data
type int.
How can I force the 1 or 0 to be an INT in order to do later math?
I've looked around and I can't seem to find a way that fits.
To be able to use previously created columns in the select, you'll need to use for example outer apply, with something like this:
select
*
from table1
outer apply (
select CASE WHEN Value > 2 THEN 1 ELSE 0 END AS Flag
) X
outer apply (
select CASE WHEN X.Flag = 1 THEN 1 ELSE 0 END AS FollowedUpCorrectly
) Y
Test this in SQL Fiddle
You could use CTE or a subquery to create a flag and then do your case statement as needed in the outer query like this:
;WITH q1
AS (
SELECT
col1
,col2
,col3
,CASE
WHEN Value > 2
THEN 1
ELSE 0
END AS 'Flag'
FROM your_table --change this to match your table and column name
)
SELECT q1.col1
,q1.col2
,q1.col3
,CASE
WHEN q1.Flag = 1
THEN 1
ELSE 0
END AS 'FollowedUpCorrectly'
FROM q1;
I might misunderstand what you are after.
CASE
WHEN Value > 2
THEN 1
ELSE 0
END AS 'Flag',
CASE
WHEN 'Flag' = 1
THEN 1
ELSE 0
END AS 'FollowedUpCorrectly'
If these two lines are in the same code block, 'Flag' is unknown in the second Case Statement.
Update: As Siyual has pointed out, Flag is a string literal. Try changing the name to something that is not a reserved word.
You are comparing a string ('Flag') to an int (1). Perhaps you meant to refer to the first case that you named 'Flag'. If so, try referring to it without using the single quotes. Then the analyzer will recognize it and accept it as an int, which it is. But 'Flag' is a string. Flag is an int.
I need to be able to count the number of records in a secondary table tblOptyRecordsHistorical which are related to the main table tblOptyRecordsCurrent.
The tables are exactly the same, the main contains the current 'daily snapshot', the secondary table contains previous daily snapshots.
I have a number of flags which use the following basic syntax:
(SELECT COUNT(OpportunityRecordID) AS Expr1
FROM dbo.tblOptyRecordsHistorical AS hist
WHERE (OpportunityGlobalCRMId = curr.OpportunityGlobalCRMId))
AS prevEntries,
This works fine. But one flag, I need to count the number of records in the historical table, but the logic is more complicated and depends on values from the main table:
SELECT OpportunityGlobalCRMId,
(SELECT SUM(CASE WHEN curr.PartnerGlobalCRMID IS NULL THEN CASE WHEN
hist.IgnoreOpportunity != 0 THEN 1 ELSE 0 END ELSE CASE
WHEN curr.CustomerAccountID IS NULL THEN CASE WHEN hist.IgnoreOpportunity = 1 AND
hist.PartnerGlobalCRMID = curr.PartnerGlobalCRMID THEN 1 ELSE 0 END ELSE CASE WHEN
hist.IgnoreOpportunity = 1 AND CONVERT(varchar, hist.CustomerAccountID) +
hist.PartnerGlobalCRMID = CONVERT(varchar, curr.CustomerAccountID) +
curr.PartnerGlobalCRMID AND hist.OpptyIncentiveCreatedDate =
curr.OpptyIncentiveCreatedDate THEN 1 ELSE 0 END END END) AS Expr1 FROM
dbo.tblOptyRecordsHistorical AS hist WHERE (OpportunityGlobalCRMId =
curr.OpportunityGlobalCRMId)) AS prevIgnored
FROM dbo.tblOptyRecordsCurrent AS curr
I've omitted the other flags and fields except for the initial OpportunityGlobalCRMID. This results in the following error: Multiple columns are specified in an aggregated expression containing an outer reference. If an expression is being aggregated contains an outer reference, then that outer reference must be the only column referenced in the expression.
SQL Server does not like mixing of inner (hist table) and outer (curr table) in a aggregate subquery expression. Some explanation is available here.
The proposed solutuon is to re-include the outer table in the sub-query, joining on it's key, in order to make all references inner. In your case, that would mean putting the tblOptyRecordsCurrent table inside the subquery, like this:
SELECT OpportunityGlobalCRMId,
(SELECT SUM(CASE
WHEN curr2.PartnerGlobalCRMID IS NULL
THEN CASE WHEN hist.IgnoreOpportunity != 0 THEN 1 ELSE 0 END
ELSE CASE
WHEN curr2.CustomerAccountID IS NULL
THEN CASE
WHEN hist.IgnoreOpportunity = 1 AND hist.PartnerGlobalCRMID = curr2.PartnerGlobalCRMID THEN 1 ELSE 0 END
ELSE CASE
WHEN hist.IgnoreOpportunity = 1
AND CONVERT(varchar, hist.CustomerAccountID) + hist.PartnerGlobalCRMID
= CONVERT(varchar, curr2.CustomerAccountID) + curr2.PartnerGlobalCRMID
AND hist.OpptyIncentiveCreatedDate = curr2.OpptyIncentiveCreatedDate
THEN 1
ELSE 0
END
END
END) AS Expr1
FROM dbo.tblOptyRecordsHistorical AS hist
inner join dbo.tblOptyRecordsCurrent AS curr2 on curr2.OpportunityGlobalCRMId = hist.OpportunityGlobalCRMId
WHERE curr2.OpportunityGlobalCRMId = curr.OpportunityGlobalCRMId) AS prevIgnored
FROM dbo.tblOptyRecordsCurrent AS curr
Haven't tested the code however.