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5.4

10 case statements repeated in my SP

Asked by Farzadw in DB2 Database

Tags: case, statement, select

I think this can be done with a Function but i wonder if using a function would make the stored proc slow...

I have this repeated 10 times but with different DATE FIELDS. My SP copied like 16000 rows from one table to another and some fields like date are formatted. It takes about 1 minute 27 seconds to run. SAME SP in SQL Server takes 32 seconds...wonder if changing the CASE would improve performance....

Insert into whatever
 select ....
     CASE   when  Substr(DATEFIELD1,4,2) = '00' then '0001-01-01'
                       when  Substr((DATEFIELD1), 1, 2 ) = '00' then '0001-01-01'
                       When  LENGTH(RTRIM(DATEFIELD1)) = 0 then '0001-01-01'
                        ELSE   case when Substr(DATEFIELD1,7,2) >= '00' and Substr(DATEFIELD1,7,2)  <= '19'
                                                    Then  date(Substr((DATEFIELD1), 1, 2 ) || '/' || Substr(DATEFIELD1,4,2)  || '/'  || '20' || Substr(DATEFIELD1,7,2))
                                                             Else  date(Substr((DATEFIELD1), 1, 2 ) || '/' || Substr(DATEFIELD1,4,2)  || '/'  || '19' || Substr(DATEFIELD1,7,2))
                                                     END
            END as DATEFIELD1,
 ....
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About this solution

Zone: DB2 Database
Tags: case, statement, select
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Solution Provided By: tliotta
Participating Experts: 4
Solution Grade: A
 
 
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