Ask the slow operation when using the subwoofer inside when
Hi allI am creating a query according to the following conditions:
Select count (*) in A Alpha, Beta B
where
(case
When
A.col1 = 'Pete' and substr (A.col2, 1, 12) = substr(B.col2,1,12)
then 1
on the other
-for all other cases, when A.col1 is not equal to 'Pete', substr 1-15 must be checked on A and B
When A.col1! = 'Pete' and substr (A.col2, 1, 15) = substr(B.col2,1,15)
then 1
0 otherwise
end) = 1
When I run the whole application together, he continues to run forever and I finally have to kill him. However, when I run the 2 WHEN clauses separately, it runs within a second and get me the correct data. What's not all by merging these two inside 2 WHEN clauses that it causes the query to drag?
Please notify.
Thanks in advance.
Not sure
Do you mean that you need much counts separately? or a combined County?
How you unite their alpha and beta tables? What is the join condition?
you need to do something like that,
SELECT COUNT(CASE WHEN
(A.col1 = 'Pete' AND SUBSTR(A.col2,,1,12)=SUBSTR(B.col2,,1,13))
OR ( A.col1 != 'Pete' AND SUBSTR(A.col2,,1,15)=SUBSTR(B.col2,,1,15))
THEN 1 ELSE 0
END)
FROM alpha A, beta b
WHERE alpha.join_cloumn= beta.join_column
G.
Tags: Database
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