组合查询纵表 有A表,结构如下:id,field,value查询目标:value为A且value为B的id写一个函数b(),入参,id,value。select a.value from a where id = 参数id and value = 参数value查询伪sql:select * from a where b(a.id,'A') is not null and b(a.id,'B') is not null