下面哪种别名用法是正确的?
A.select staff _id as id from staffs B.select staff _id id from staffs; C.select staff id' id' from staffs; D.select staff id "id"from staffs:正确答案ABD
下面哪种别名用法是正确的?
A.select staff _id as id from staffs B.select staff _id id from staffs; C.select staff id' id' from staffs; D.select staff id "id"from staffs:正确答案ABD