oracle多结果集嵌套循环处理优化 --性能差 begin for a in (select id,name,sex,idcard from people) loop for b in (select id,name,sex,idcard from english) loop if a.idcard = b.idcard then --do something end if; end loop; end loop; end; --性能优:将多表合并成一个结果集,避免嵌套循环 begin for…