Ah, yes, the "update a substring" problem. You can do a lot of things with SUBSTR, but you can't update a portion of a field using SUBSTR. The trick is to update the target field using a concatenation of the part BEFORE the substring, the new value, and then the part AFTER the substring. So, in your case, it would be: UPDATE FILEA SET FIELD2 = SUBSTR(FIELD2,1,88) || 'XX' || SUBSTR(FIELD2,91,153) WHERE SUBSTR(FIELD1,1,3) = 'TRD' AND SUBSTR(FIELD2,89,2) = 'AA' The set combines the first 88 characters of FIELD2, the literal XX, and the last 153 characters of FIELD2, and puts the whole mess back into FIELD2. Use this template whenever you need to do a partial update of a field. Joe
From: Rowe, Sheri I need to write a 'quick' interactive SQL statement to update a file based on the conditional field being a substring and the result field being a substring. FileA Field1 (7,A) position 1,3 contains many values, but I need only 'TRD' records and position 4-7 contains a customer number value e.g. TRD1100, TRD5555, TRD6789 etc Field2 (243,A) contains many values, but I need to extract positions 89-90 I need to update all Field1 'TRD' records where field2 position 89-90 = 'AA' to be value 'XX'