DB2 convert to date format

DB2 string like the following MDDYYYY or 0 meaning null.  How to convert to date?  Thanks.

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ewang1205Asked:
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Kent OlsenData Warehouse Architect / DBACommented:
An easier to read SQL might look like the code below.


Kent

SELECT date (case LENGTH (myvalue)
       when 8 then right (myvalue, 4) || '-' || substr (myvalue, 3, 2) || '-' || left (myvalue, 2)
       when 7 then right (myvalue, 4) || '-' || substr (myvalue, 2, 2) || '-0' || left (myvalue, 1)
       else NULL
       end) mydate
FROM ....

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Kent OlsenData Warehouse Architect / DBACommented:
Hi ewang,

Oddly, you can get DB2 to produce a date-like value similar to what you show from a date field, but going from that value to a date is a bit more involved.  You simply need to build the data string yourself.

The code below will be close.


Good Luck,
Kent

SELECT 
  case when myvalue = 0 then NULL
       else date (right (myvalue, 4) || '-' || 
            cast (mod (cast (myvalue as integer) / 1000, 100) as char(2)) || '-' ||
            right ('0' || cast ((cast (myvalue as integer) / 100000) as varchar (2)), 2))
  end mydate
FROM ....

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tliottaCommented:
You might also do something like RIGHT('00000000' concat TRIM(myvalue), 8)... assuming MYVALUE is a CHAR(8).

Tom
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