postgresql 自定义aggregate function实现reduce
发布时间:2020-12-13 17:02:50 所属栏目:百科 来源:网络整理
导读:create or replace function lmy(first INTEGER,item INTEGER) returns INTEGER as $$BEGIN return first * item;END;$$LANGUAGE plpgsql;create aggregate yml(INTEGER) ( sfunc = lmy,stype = INTEGER,initcond = 1); isnp=# select i,yml(i) over (order
create or replace function lmy(first INTEGER,item INTEGER) returns INTEGER as $$ BEGIN return first * item; END; $$ LANGUAGE plpgsql; create aggregate yml(INTEGER) ( sfunc = lmy,stype = INTEGER,initcond = 1 ); isnp=# select i,yml(i) over (order by i) from generate_series(1,10) i;
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