Dan Langille <dan(at)langille(dot)org> writes:
> What error code would be raised for a duplicate index name?
regression=# \set VERBOSITY verbose
regression=# create table t1 (f1 int);
CREATE TABLE
regression=# create index t1i on t1(f1);
CREATE INDEX
regression=# create index t1i on t1(f1);
ERROR: 42P07: relation "t1i" already exists
LOCATION: index_create, index.c:567
Evidently it's ERRCODE_DUPLICATE_TABLE.
regards, tom lane