Re: Sv: [SQL] how to build this query ??? Please help !!!

[Jens Hartwig]

> [...]
> SELECT a_nr,
> (SELECT count(*) FROM cylinders WHERE z_a_nr = a_nr) AS #cylinder,
> [...]
> FROM orders
> [...]

Is this a documented feature? Where can I find more information about
this?  I do not want to join the actual discussion about documentation
of PostgreSQL but I never before have seen such a construct in SQL!

Best regards, Jens Hartwig

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Jens Hartwig
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