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Poor performance with CASE statement and sub-query

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Summary:

Custom analysis with CASE statement extremely slow

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Good afternoon,

I have created an OTBI analysis that yields the names of line managers whose direct reports are employees only (a requirement of our organisation). In order to do that, I have used a CASE statement that checks if the person number is in the sub-folder "Manager", using a sub-query as follows:

CASE  WHEN "Worker"."Person Number" IN ( SELECT "Workforce Management - Worker Assignment Real Time"."Manager"."Person Number"         FROM "Workforce Management - Worker Assignment Real Time"    WHERE (DESCRIPTOR_IDOF("Workforce Management - Worker Assignment Real Time"."Worker Assignment Details"."Assignment Type") = 'E')   AND (DESCRIPTOR_IDOF("Workforce Management - Worker Assignment Real Time"."Worker Assignment Details"."Assignment Status Type") = 'ACTIVE')    AND CURRENT_DATE BETWEEN "Workforce Management - Worker Assignment Real Time"."Worker Assignment Details"."Effective Start Date" AND "Workforce Management - Worker Assignment Real Time"."Worker Assignment Details"."Effective End Date") THEN 'Yes'  ELSE 'No'  END

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