On 12/8/2014 3:08 PM, Luuk wrote:
i hope this does it:

update temp_table
set id=(select id from some_table where c=42),
operation='UPDATE'
where exists (select 1
     from some_table s, temp_table t
     where s.a=t.a and s.b=t.b);

This updates all rows in temp_table, as long as at least one row in temp_table matches one row in some_table. In other words, it updates no rows, or all rows - never just some.
--
Igor Tandetnik

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