"Poul L. Christiansen" <[EMAIL PROTECTED]> writes:
> But how do I make an outer join?
> What's the syntax?
> I will RTFM if someone points me to the docs :-)
I'm afraid I haven't updated the FM yet :-( ... but you could look at
the examples in the JOIN regress test, src/test/regress/sql/join.sql.
Or, from the SQL92 spec, here's the grammar:
<from clause> ::= FROM <table reference> [ { <comma> <table reference> }... ]
<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>
<derived column list> ::= <column name list>
<column name list> ::=
<column name> [ { <comma> <column name> }... ]
<joined table> ::=
<cross join>
| <qualified join>
| <left paren> <joined table> <right paren>
<cross join> ::=
<table reference> CROSS JOIN <table reference>
<qualified join> ::=
<table reference> [ NATURAL ] [ <join type> ] JOIN
<table reference> [ <join specification> ]
<join specification> ::=
<join condition>
| <named columns join>
<join condition> ::= ON <search condition>
<named columns join> ::=
USING <left paren> <join column list> <right paren>
<join type> ::=
INNER
| <outer join type> [ OUTER ]
| UNION
<outer join type> ::=
LEFT
| RIGHT
| FULL
<join column list> ::= <column name list>
We don't do UNION JOIN yet, but I think everything else shown in this
snippet is implemented ...
regards, tom lane
