1
MySQL中如何实现以下SQL查询
(SELECT S.Name
FROM STUDENT S, TRANSCRIPT T
WHERE S.StudId = T.StudId AND T.CrsCode = 'CS305')
INTERSECT
(SELECT S.Name
FROM STUDENT S, TRANSCRIPT T
WHERE S.StudId = T.StudId AND T.CrsCode = 'CS315')
请各位不吝赐教,小弟先谢过~
解:
取交集
select a.* from
(
SELECT S.Name
FROM STUDENT S, TRANSCRIPT T
WHERE S.StudId = T.StudId AND T.CrsCode = 'CS305'
) as a
cross join
(
SELECT S.Name
FROM STUDENT S, TRANSCRIPT T
WHERE S.StudId = T.StudId AND T.CrsCode = 'CS315'
) as b on a.Name = b.Name;
2.
SELECT * FROM (
SELECT DISTINCT col1 FROM t1 WHERE...
UNION ALL
SELECT DISTINCT col1 FROM t1 WHERE...
) AS tbl
GROUP BY tbl.col1 HAVING COUNT(*) = 2
3.
交集:
SELECT * FROM table1 AS a JOIN table2 AS b ON a.name =b.name
举例:
表a:
FieldA
001
002
003
表b:
FieldA
001
002
003
004
请教如何才能得出以下结果集,即表A, B行交集
FieldA
001
002
003
答案:select a.FieldA from a inner join b on a.FieldA=b.FieldA
差集:
NOT IN 表示差集
SELECT * FROM table1 WHERE name NOT IN (SELECT name FROM table2)
MySQL中如何实现以下SQL查询
(SELECT S.Name
FROM STUDENT S, TRANSCRIPT T
WHERE S.StudId = T.StudId AND T.CrsCode = 'CS305')
INTERSECT
(SELECT S.Name
FROM STUDENT S, TRANSCRIPT T
WHERE S.StudId = T.StudId AND T.CrsCode = 'CS315')
请各位不吝赐教,小弟先谢过~
解:
取交集
select a.* from
(
SELECT S.Name
FROM STUDENT S, TRANSCRIPT T
WHERE S.StudId = T.StudId AND T.CrsCode = 'CS305'
) as a
cross join
(
SELECT S.Name
FROM STUDENT S, TRANSCRIPT T
WHERE S.StudId = T.StudId AND T.CrsCode = 'CS315'
) as b on a.Name = b.Name;
2.
SELECT * FROM (
SELECT DISTINCT col1 FROM t1 WHERE...
UNION ALL
SELECT DISTINCT col1 FROM t1 WHERE...
) AS tbl
GROUP BY tbl.col1 HAVING COUNT(*) = 2
3.
交集:
SELECT * FROM table1 AS a JOIN table2 AS b ON a.name =b.name
举例:
表a:
FieldA
001
002
003
表b:
FieldA
001
002
003
004
请教如何才能得出以下结果集,即表A, B行交集
FieldA
001
002
003
答案:select a.FieldA from a inner join b on a.FieldA=b.FieldA
差集:
NOT IN 表示差集
SELECT * FROM table1 WHERE name NOT IN (SELECT name FROM table2)
标签:
MySQL,交集,实现
免责声明:本站文章均来自网站采集或用户投稿,网站不提供任何软件下载或自行开发的软件!
如有用户或公司发现本站内容信息存在侵权行为,请邮件告知! 858582#qq.com
白云城资源网 Copyright www.dyhadc.com
暂无“MySQL 查询结果取交集的实现方法”评论...
更新日志
2024年07月03日
2024年07月03日
- 单依纯《纯情歌》2024最新 开盘母带1:1直刻[547M]
- 永劫无间手游沈妙怎么样 技能奥义介绍
- 三角洲行动穿透机制介绍 穿透等级穿透效果一览
- 吟游战记巨刃特蕾值得培养吗 角色技能属性详解
- 逆水寒手游创意工坊玩法介绍 逆水寒创意工坊怎么玩
- 逆水寒手游雀隐重楼玩法介绍 逆水寒手游雀隐重楼是什么
- 逆水寒手游神器系统玩法攻略 逆水寒手游神器系统怎么玩
- PS5首席架构师提交新专利:PS5有望原生运行PS3游戏?
- 数据显示:《地狱潜者2》在PC平台已失去90%的玩家
- 质疑和守望先锋太像?《星鸣特攻》开发商:我们与众不同
- 【休闲沙发】VA-2024-CalmReflections:ChilloutYourMind(FLAC)
- 【迷幻沙发】Koan(公案)-2024-TheQueenofSpades(SideA)(FLAC)
- 群星2006-银河映像1996-20052CD[香港首版][WAV+CUE]
- 外媒盘点游戏里十大最可怕外星生物:第一名是老熟人
- 阿拉贡演员谈参演《咕噜》新电影:要视情况而定