I m looking for a way to optimise the following:
SELECT
(SELECT SUM(amount) FROM Txn_Log WHERE gid=@gid AND txnType IN (3, 20)) AS pendingAmount,
(SELECT COUNT(1) FROM Txn_Log WHERE gid = @gid AND txnType = 11) AS pendingReturn,
(SELECT COUNT(1) FROM Txn_Log WHERE gid = @gid AND txnType = 5) AS pendingBlock
where @gid is a parameter and gid is an index field on this table. Problem: each sub-query reruns on the same set of entries - three reruns are two too many.
You can do like this:
select
sum(case when txnType in (3,20) then amount else 0 end) as pendingAmount,
sum(case txnType when 11 then 1 else 0 end) as pendingReturn,
sum(case txnType when 5 then 1 else 0 end) as pendingBlock
from
Txn_Log
where
gid = @gid
Can you not do something like this
SELECT sum(amount),count(1), txnType
FROM Txn_log
WHERE gid = @gid AND
txnType in (3,5,11,20)
group by txnType
and then handle the rest of it programmatically?
I noticed that there were some threads with similar questions, and I did look through them but did not really get a convincing answer. Here s my question: The subquery below returns a Table with 3 ...
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