Re: Is it possible to create a sub select where the sub select refreshes itself for each record read?

This is one I always need.

I am reading table_A and need to check if the record exists in TABLE_B.
If it does not exist in tableB, I need to add it to table_B.

Problem is this will generate duplicate records.

Is there a way to have the sub select refresh itself before the next SELECT
is executed? I would like the sub select to be dynamic and sensitive to
each insert.

Example:
INSERT into TABLE_B (FIELD_A)
(SELECT FIELD_A
from TABLE_A
where FIELD_A not in (Select Field_A from TABLE_B)

TIA, Darryl Freinkel.
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