Alternative way to write delete query

Hi List,

I'm having a mental blank and looking for suggestions... I'm trying to remember alternative ways to write the below query:

delete from table
where column in (select col_a

              from table_b
              union all
              select col_b
              from table_b);

Having said that, I don't mind if you simplify the nested query down to "select col_a from table_b" even. I just have a feeling that I've seen an equivalent query written totally differently but I can't remember how. I have a feeling it effectively allows more than one table to be mentioned in the delete without needing a nested query (like the options available in normal selects).

Any suggestions?

Thanks,

      Mark.

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