I need to update a 12 characters field starting from position 6 to 9 with '0000' using interactive SQL.
First I need to check if the 12 character field starting from position 6 to 12 is blank then update this field from start position 6 with 0000.

Before MYFLD = '12345 '
After MYFLD = '123450000 '

Something like this

UPDATE MYLIB/MFFILE SET myFLD = substr(myFLD,6,4) ='0000'
where myFLD = substr(myFLD,6,8) =' '

TIA





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