小编Tom*_*com的帖子

我想创建查询跟随.

select member.name,depratment.name from member 
left join depratment on depratment.dep_id=member.dep_id
if(member.position_id=1){
 where member.ages>50; 
}
else{
where member.salary>50000;
}

帮我？谢谢.