摘要: select * from student s where s.stuName in(“张三”,“李四”,“王五”)and s.age>18 and s.sex=‘男’; 优化后的sql: select * from student s where s.stuName=“张三” and s.age> 阅读全文
posted @ 2020-10-31 09:53 大熊童鞋 阅读(2330) 评论(0) 推荐(0) 编辑