select * from pg_tables; select * from current_user; select 1+2 "1+2"; select current_timestamp;原文链接：https://www.f2er.com/postgresql/195386.html
select * from pg_tables; select * from current_user; select 1+2 "1+2"; select current_timestamp;原文链接：https://www.f2er.com/postgresql/195386.html
