Re: [GENERAL] Delete from Join

[Gwyneth Morrison]

Tom Lane wrote: Gwyneth Morrison <[EMAIL PROTECTED]> writes: What I am actually trying to get past is: DELETE FROM data_table1 using data_table2 INNER JOIN data_table1 ON data_table1.fkey = data_table2.pkey; The equivalent to that in Postgres would be DELETE FROM data_table1 USING data_table2 WHERE data_table1.fkey = data_table2.pkey; The fundamental issue here is that MSSQL expects the USING clause to contain a second reference to the delete target table, whereas PG does not --- if you write the table name again, that's effectively a self-join and you probably won't get the behavior you want. You can use JOIN syntax in USING in Postgres, but only for situations where the query really involves three or more tables. regards, tom lane Thank you Tom, That was exactly what I needed to know and yes it does work. I do know about the using/from clause and  and the second table reference. Sorry about the above example, I cut it from something much larger to try and get my point  across. Yes it is invalid. I should be more careful. I do have another question I will post as a separate posting. Gwyneth