create_aggregate.out

来自「postgresql8.3.4源码,开源数据库」· OUT 代码 · 共 46 行

--
-- CREATE_AGGREGATE
--
-- all functions CREATEd
CREATE AGGREGATE newavg (
   sfunc = int4_avg_accum, basetype = int4, stype = _int8, 
   finalfunc = int8_avg,
   initcond1 = '{0,0}'
);
-- test comments
COMMENT ON AGGREGATE newavg_wrong (int4) IS 'an agg comment';
ERROR:  aggregate newavg_wrong(integer) does not exist
COMMENT ON AGGREGATE newavg (int4) IS 'an agg comment';
COMMENT ON AGGREGATE newavg (int4) IS NULL;
-- without finalfunc; test obsolete spellings 'sfunc1' etc
CREATE AGGREGATE newsum (
   sfunc1 = int4pl, basetype = int4, stype1 = int4, 
   initcond1 = '0'
);
-- zero-argument aggregate
CREATE AGGREGATE newcnt (*) (
   sfunc = int8inc, stype = int8,
   initcond = '0'
);
-- old-style spelling of same
CREATE AGGREGATE oldcnt (
   sfunc = int8inc, basetype = 'ANY', stype = int8,
   initcond = '0'
);
-- aggregate that only cares about null/nonnull input
CREATE AGGREGATE newcnt ("any") (
   sfunc = int8inc_any, stype = int8,
   initcond = '0'
);
-- multi-argument aggregate
create function sum3(int8,int8,int8) returns int8 as
'select $1 + $2 + $3' language sql strict immutable;
create aggregate sum2(int8,int8) (
   sfunc = sum3, stype = int8,
   initcond = '0'
);
COMMENT ON AGGREGATE nosuchagg (*) IS 'should fail';
ERROR:  aggregate nosuchagg(*) does not exist
COMMENT ON AGGREGATE newcnt (*) IS 'an agg(*) comment';
COMMENT ON AGGREGATE newcnt ("any") IS 'an agg(any) comment';