If I run the query
"select * from (select * from table_name)"
PostgreSQL complains with
ERROR: subquery in FROM must have an alias
HINT: For example, FROM (SELECT ...) [AS] foo.
Is the alias required by the ISO standard or is this a PostgreSQL
requirement?
TIA
--
Groeten,
Joost Kraaijeveld
Askesis B.V.
Molukkenstraat 14
6524NB Nijmegen
tel: 024-3888063 / 06-51855277
fax: 024-3608416
web: www.askesis.nl
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> PostgreSQL complains with
> ERROR: subquery in FROM must have an alias
> HINT: For example, FROM (SELECT ...) [AS] foo.
> Is the alias required by the ISO standard
Yes. A FROM-clause entry is defined as
<table reference> ::=
<table name> [ [ AS ] <correlation name>
[ <left paren> <derived column list> <right paren> ] ]
| <derived table> [ AS ] <correlation name>
[ <left paren> <derived column list> <right paren> ]
| <joined table>
<derived table> ::= <table subquery>
Note that the brackets show that a <correlation name> (ie, an alias)
is optional for a regular table, but not for a subquery.
regards, tom lane
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