"Pavel Stehule" <[EMAIL PROTECTED]> writes:
> I can't find any information of syntax for ANSI Conformance F262, F263.
Has
> somebody any information about this points: Extended CASE expression,
comma
> separated predicates in simple case expression
There are no such feature IDs listed in either SQL99 or SQL2003. What
are you reading?
regards, tom lane
First, I looked
http://www.postgresql.org/docs/8.1/interactive/unsupported-features-sql-standard.html
I don't found any information on internet - only BNF syntax for SQL 2003.
http://savage.net.au/SQL/sql-2003-2.bnf.html#xref-CASE
SQL2003 has little bit different syntax for CASE.
example: BETWEEN
<between> := <row value> between_part2
<between_part2> := [NOT] BETWEEN [ASYMMETRIC|SYMMETRIC] <row value> AND <row
value>
---------------------------
<simple_case> := CASE <row value> <simple_when_clause> [<else_clause>] END
<simple_when_clause := WHEN <when_operand> THEN <result>
<when_operand> := <row value> | <between_part2> | ....
so I can:
SELECT
CASE EXTRACT(minute FROM when_col)
WHEN BETWEEN 0 AND 14 THEN 0
WHEN BETWEEN 15 AND 29 THEN 15
WHEN BETWEEN 30 AND 44 THEN 30
ELSE 45
END
this is extended CASE expression propably F262. About F263 I don't found any
indicies. Maybe it's
SELECT CASE col
WHEN 1,3,5,7,9,11 THEN false
ELSE END
I looked into parser. F262 is usefull, but I am not sure if can be
implemented. It's need refactoring gram.y or duplicate code for CASE, and
maybe others - is possible share one operand in more expressions?
I see others ANSI or NON ANSI enhancing as much usefull: window function or
autonomous transaction.
Regards
Pavel Stehule
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