by gwynethm@[EMAIL PROTECTED]
(Gwyneth Morrison)
Jul 4, 2008 at 10:00 AM
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Tom Lane wrote:
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<pre wrap="">Gwyneth Morrison <a class="moz-txt-link-rfc2396E"
href="mailto:gwynethm@[EMAIL PROTECTED]
"><gwynethm@[EMAIL PROTECTED]
>
writes:
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<pre wrap="">What I am actually trying to get past is:
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<pre wrap=""><!---->
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<pre wrap=""> DELETE FROM data_table1
using data_table2 INNER JOIN
data_table1 ON data_table1.fkey =
data_table2.pkey;
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<pre wrap=""><!---->
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
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Thank you Tom,<br>
<br>
That was exactly what I needed to know and yes it does work.<br>
<br>
I do know about the using/from clause and and the second table
reference.<br>
<br>
Sorry about the above example, I cut it from something much larger to
try and <br>
get my point across. Yes it is invalid. I should be more
careful.<br>
<br>
I do have another question I will post as a separate posting. <br>
<br>
Gwyneth<br>
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