📄 view.sql
字号:
CREATE VIEW SBOY(S#,SNAME,CNAME,GRADE)
AS
SELECT S.S#,S.SNAME,C.CNAME,SC.GRADE
FROM S,C,SC
WHERE S.SEX='M' AND S.S#=SC.S# AND SC.C# = C.C#;
SELECT S#,SNAME
FROM SBOY
WHERE S# IN(SELECT S#
FROM SBOY
GROUP BY S#
HAVING AVG(GRADE)>80);
SELECT COUNT(C#), AVG(GRADE)
FROM SC
GROUP BY S#;
CREATE USER us
IDENTIFIED BY us;
GRANT select
ON S
TO us;
REVOKE select
ON S
FROM us;
GRANT select
ON SC
TO us;
REVOKE select
ON SC
FROM us;
GRANT select
ON C
TO us;
REVOKE select
ON C
FROM us;
⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -