On 2023-Jul-24, Dean Rasheed wrote: > Something else I noticed: the error message from ALTER TABLE ... ADD > CONSTRAINT in the case of a duplicate constraint name is not very > friendly: > > ERROR: duplicate key value violates unique constraint > "pg_constraint_conrelid_contypid_conname_index" > DETAIL: Key (conrelid, contypid, conname)=(16540, 0, nn) already exists. > > To match the error message for other constraint types, this should be: > > ERROR: constraint "nn" for relation "foo" already exists
Hmm, how did you get this one? I can't reproduce it: 55490 17devel 3166154=# create table foo (a int constraint nn not null); CREATE TABLE 55490 17devel 3166154=# alter table foo add constraint nn not null a; ERROR: column "a" of table "foo" is already NOT NULL 55490 17devel 3166154=# drop table foo; DROP TABLE 55490 17devel 3166154=# create table foo (a int); CREATE TABLE Duración: 1,472 ms 55490 17devel 3166154=# alter table foo add constraint nn not null a, add constraint nn not null a; ERROR: column "a" of table "foo" is already NOT NULL -- Álvaro Herrera Breisgau, Deutschland — https://www.EnterpriseDB.com/ "El número de instalaciones de UNIX se ha elevado a 10, y se espera que este número aumente" (UPM, 1972)
