CREATE AGGREGATE

Sintáxis:

        CREATE AGGREGATE agg_name [AS] (BASETYPE = data_type, 
        [SFUNC1 = sfunc_1, STYPE1 = sfunc1_return_type]
        [SFUNC2 = sfunc_2, STYPE2 = sfunc2_return_type]
        [,FINALFUNC = final-function]
        [,INITCOND1 = initial-cond1][,INITCOND2 = initial-cond2]);