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Hi ,

Looks like ADD UNIQUE( some_fuc( some_feild) ) is not supported with add constraint.
the only way is to add the constriant is using UNIQUE INDEX .

Is it a bug or intended behaviour?

in 7.3.4

tradein_clients=# ALTER TABLE general.email_master ADD CONSTRAINT
email_master_uniq_lower_btrim_email UNIQUE( lower(email) );

ERROR: parser: parse error at or near "(" at character 99

tradein_clients=# CREATE UNIQUE INDEX email_master_uniq_lower_btrim_email on general.email_master( lower(email) );
ERROR: Cannot create unique index. Table contains non-unique values

Well the SQL has failed but it was parsed successfully.



template1=# alter table t_a add constraint "a" UNIQUE (email);
NOTICE: ALTER TABLE / ADD UNIQUE will create implicit index "a" for table "t_a"
template1=# alter table t_a add constraint "b" UNIQUE (lower(email));
ERROR: syntax error at or near "(" at character 54

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Nov 12 '05 #1
1 9282
Rajesh Kumar Mallah <ma****@trade-india.com> writes:
Looks like ADD UNIQUE( some_fuc( some_feild) ) is not supported with add constraint.
the only way is to add the constriant is using UNIQUE INDEX .
Is it a bug or intended behaviour?

It's intended. The syntax and behavior of unique constraints is defined
by the standard, and it doesn't include anything about functional

regards, tom lane

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Nov 12 '05 #2

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