Embedded SQL weirdness -- MIDRANGE-L

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To all SQL gurus:

 I have an OPM RPG program w/ emmbedded SQL. The statement looks something
like this:

C+  DELETE FROM LIB/FILE  WHERE DBFLD = :WRKFLD

1)  If DBFLD is defined as 4 alpha and WRKFLD is 2 alpha, but the right 2
positions are always blank (i.e. DBFLD = 'ZZ  ' and WRKFLD = 'ZZ'), should
this get a hit?

2)  If the program is not under commitment control but the program is
compiled with the default COMMIT( *CHANGE ), should this affect the results
of the update?

 This is under V3R2.  TIA.

 -mark

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