problem with check constraints

Hello, Anton

Its ok, because conjunction (AND) has priority over disjunction (OR) so
((A and B) or (C and D)) = (A and B or C and D)

Anton Andreev rašė:

Hi,

When I create a check constraint in PgAdmin3 1.8.4 on a Postgresql
8.3.3: ((A and B) or (C and D))
I get with create script: (A and B or C and D) which is wrong.

Please help.

Cheers,
Anton

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Anton Andreev wrote:

When I create a check constraint in PgAdmin3 1.8.4 on a Postgresql
8.3.3: ((A and B) or (C and D))
I get with create script: (A and B or C and D) which is wrong.

No, it isn't - both are the same.

AND has higher operator precedence than OR, see
http://www.postgresql.org/docs/8.3/static/sql-syntax-lexical.html#SQL-PRECEDENCE-TABLE

Yours,
Laurenz Albe