面试题数据库sql

一、建表的结构和数据，在sqlserver直接用就行了

USE [test]
GO
/****** Object:  Table [dbo].[TEACHER]    Script Date: 05/16/2018 16:27:24 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[TEACHER](
    [T#] [int] NOT NULL,
    [TNAME] [nvarchar](50) NOT NULL,
PRIMARY KEY CLUSTERED 
(
    [T#] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
INSERT [dbo].[TEACHER] ([T#], [TNAME]) VALUES (50, N'李冰冰')
INSERT [dbo].[TEACHER] ([T#], [TNAME]) VALUES (51, N'黄一山')
INSERT [dbo].[TEACHER] ([T#], [TNAME]) VALUES (52, N'陈小春')
INSERT [dbo].[TEACHER] ([T#], [TNAME]) VALUES (53, N'赵铁柱')
INSERT [dbo].[TEACHER] ([T#], [TNAME]) VALUES (54, N'钱中书')
INSERT [dbo].[TEACHER] ([T#], [TNAME]) VALUES (55, N'孙悟空')
INSERT [dbo].[TEACHER] ([T#], [TNAME]) VALUES (56, N'李连杰')
INSERT [dbo].[TEACHER] ([T#], [TNAME]) VALUES (57, N'杨千嬅')
INSERT [dbo].[TEACHER] ([T#], [TNAME]) VALUES (58, N'泽日生')
INSERT [dbo].[TEACHER] ([T#], [TNAME]) VALUES (59, N'林夕')
INSERT [dbo].[TEACHER] ([T#], [TNAME]) VALUES (60, N'陈奕迅')
INSERT [dbo].[TEACHER] ([T#], [TNAME]) VALUES (61, N'刘备')
/****** Object:  Table [dbo].[STUDENT]    Script Date: 05/16/2018 16:27:24 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
SET ANSI_PADDING ON
GO
CREATE TABLE [dbo].[STUDENT](
    [S#] [int] NOT NULL,
    [SNAME] [nvarchar](50) NOT NULL,
    [SAGE] [int] NOT NULL,
    [SSEX] [char](2) NOT NULL,
PRIMARY KEY CLUSTERED 
(
    [S#] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
SET ANSI_PADDING OFF
GO
INSERT [dbo].[STUDENT] ([S#], [SNAME], [SAGE], [SSEX]) VALUES (1, N'小红', 10, N'女')
INSERT [dbo].[STUDENT] ([S#], [SNAME], [SAGE], [SSEX]) VALUES (2, N'小明', 12, N'男')
INSERT [dbo].[STUDENT] ([S#], [SNAME], [SAGE], [SSEX]) VALUES (3, N'小绿', 13, N'男')
INSERT [dbo].[STUDENT] ([S#], [SNAME], [SAGE], [SSEX]) VALUES (4, N'小蓝', 15, N'男')
INSERT [dbo].[STUDENT] ([S#], [SNAME], [SAGE], [SSEX]) VALUES (5, N'小青', 11, N'男')
INSERT [dbo].[STUDENT] ([S#], [SNAME], [SAGE], [SSEX]) VALUES (6, N'小白', 10, N'女')
INSERT [dbo].[STUDENT] ([S#], [SNAME], [SAGE], [SSEX]) VALUES (7, N'小紫', 14, N'女')
INSERT [dbo].[STUDENT] ([S#], [SNAME], [SAGE], [SSEX]) VALUES (8, N'小黄', 13, N'男')
INSERT [dbo].[STUDENT] ([S#], [SNAME], [SAGE], [SSEX]) VALUES (9, N'小粉', 12, N'女')
INSERT [dbo].[STUDENT] ([S#], [SNAME], [SAGE], [SSEX]) VALUES (10, N'小橙', 11, N'女')
INSERT [dbo].[STUDENT] ([S#], [SNAME], [SAGE], [SSEX]) VALUES (11, N'小黑', 9, N'男')
INSERT [dbo].[STUDENT] ([S#], [SNAME], [SAGE], [SSEX]) VALUES (12, N'小粉', 14, N'男')
/****** Object:  Table [dbo].[SC]    Script Date: 05/16/2018 16:27:24 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[SC](
    [S#] [int] NULL,
    [C#] [nvarchar](50) NULL,
    [SCORE] [int] NOT NULL
) ON [PRIMARY]
GO
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (1, N'111', 69)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (1, N'112', 80)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (1, N'113', 75)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (1, N'114', 79)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (1, N'115', 63)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (1, N'116', 90)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (1, N'117', 95)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (1, N'118', 77)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (1, N'119', 60)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (1, N'120', 83)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (1, N'121', 88)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (1, N'122', 75)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (1, N'123', 50)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (1, N'124', 44)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (1, N'125', 77)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (1, N'127', 79)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (1, N'128', 77)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (2, N'111', 77)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (2, N'112', 68)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (2, N'113', 76)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (2, N'114', 95)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (2, N'115', 90)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (2, N'116', 57)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (2, N'117', 99)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (2, N'118', 86)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (2, N'120', 73)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (2, N'121', 73)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (2, N'122', 82)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (2, N'123', 67)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (2, N'124', 69)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (2, N'125', 53)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (2, N'126', 64)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (2, N'127', 75)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (2, N'128', 71)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (3, N'111', 82)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (3, N'112', 67)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (3, N'113', 69)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (3, N'114', 44)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (3, N'115', 77)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (3, N'116', 98)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (3, N'117', 79)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (3, N'118', 77)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (3, N'119', 68)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (3, N'120', 76)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (3, N'121', 95)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (3, N'122', 73)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (3, N'123', 82)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (3, N'124', 63)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (3, N'125', 90)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (3, N'126', 95)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (3, N'127', 77)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (3, N'128', 60)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (4, N'111', 77)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (4, N'112', 68)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (4, N'113', 76)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (4, N'114', 95)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (4, N'115', 73)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (4, N'116', 82)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (4, N'117', 76)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (4, N'118', 95)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (4, N'119', 90)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (4, N'120', 57)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (4, N'121', 69)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (4, N'122', 80)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (4, N'123', 75)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (4, N'124', 79)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (4, N'125', 68)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (4, N'126', 54)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (4, N'127', 77)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (4, N'128', 90)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (5, N'111', 77)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (5, N'112', 98)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (5, N'113', 79)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (5, N'115', 68)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (5, N'116', 85)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (5, N'117', 83)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (5, N'118', 81)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (5, N'119', 95)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (5, N'120', 90)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (5, N'121', 57)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (5, N'122', 69)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (5, N'124', 75)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (5, N'125', 75)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (5, N'126', 70)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (5, N'127', 53)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (5, N'128', 50)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (6, N'113', 90)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (6, N'114', 57)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (6, N'115', 69)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (6, N'116', 80)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (6, N'117', 60)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (6, N'118', 73)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (6, N'120', 73)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (6, N'121', 76)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (6, N'122', 95)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (6, N'123', 90)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (6, N'124', 57)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (6, N'125', 69)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (6, N'126', 80)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (6, N'128', 74)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (7, N'111', 57)
GO
print 'Processed 100 total records'
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (7, N'112', 69)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (7, N'114', 60)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (7, N'115', 73)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (7, N'116', 90)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (7, N'124', 57)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (7, N'125', 43)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (7, N'126', 65)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (7, N'127', 73)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (7, N'128', 80)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (8, N'111', 71)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (8, N'112', 69)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (8, N'113', 77)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (8, N'114', 81)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (8, N'115', 95)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (8, N'116', 90)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (8, N'117', 57)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (8, N'119', 65)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (8, N'120', 73)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (8, N'121', 80)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (8, N'122', 66)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (8, N'123', 80)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (8, N'124', 60)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (8, N'125', 73)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (8, N'126', 90)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (8, N'127', 73)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (8, N'128', 76)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (9, N'111', 68)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (9, N'112', 72)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (9, N'114', 45)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (9, N'115', 73)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (9, N'116', 80)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (9, N'117', 66)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (9, N'118', 80)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (9, N'121', 92)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (9, N'122', 57)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (9, N'123', 69)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (9, N'124', 80)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (9, N'125', 60)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (9, N'126', 73)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (9, N'127', 79)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (10, N'111', 71)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (10, N'112', 69)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (10, N'113', 77)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (10, N'114', 81)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (10, N'116', 96)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (10, N'117', 50)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (10, N'118', 40)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (10, N'119', 63)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (10, N'120', 92)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (10, N'121', 57)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (10, N'122', 69)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (10, N'123', 80)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (10, N'124', 62)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (10, N'125', 73)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (10, N'127', 92)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (10, N'128', 73)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (11, N'124', 99)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (12, N'122', 100)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (12, N'126', 99)
INSERT [dbo].[SC] ([S#], [C#], [SCORE]) VALUES (12, N'124', 97)
/****** Object:  Table [dbo].[COURSE]    Script Date: 05/16/2018 16:27:24 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[COURSE](
    [C#] [int] NOT NULL,
    [CNAME] [nvarchar](50) NOT NULL,
    [T#] [nvarchar](50) NOT NULL,
PRIMARY KEY CLUSTERED 
(
    [C#] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
INSERT [dbo].[COURSE] ([C#], [CNAME], [T#]) VALUES (111, N'语文1', N'50')
INSERT [dbo].[COURSE] ([C#], [CNAME], [T#]) VALUES (112, N'语文2', N'51')
INSERT [dbo].[COURSE] ([C#], [CNAME], [T#]) VALUES (113, N'数学1', N'52')
INSERT [dbo].[COURSE] ([C#], [CNAME], [T#]) VALUES (114, N'数学2', N'53')
INSERT [dbo].[COURSE] ([C#], [CNAME], [T#]) VALUES (115, N'英语1', N'54')
INSERT [dbo].[COURSE] ([C#], [CNAME], [T#]) VALUES (116, N'英语2', N'55')
INSERT [dbo].[COURSE] ([C#], [CNAME], [T#]) VALUES (117, N'生物1', N'56')
INSERT [dbo].[COURSE] ([C#], [CNAME], [T#]) VALUES (118, N'生物2', N'57')
INSERT [dbo].[COURSE] ([C#], [CNAME], [T#]) VALUES (119, N'物理1', N'58')
INSERT [dbo].[COURSE] ([C#], [CNAME], [T#]) VALUES (120, N'物理2', N'59')
INSERT [dbo].[COURSE] ([C#], [CNAME], [T#]) VALUES (121, N'化学1', N'60')
INSERT [dbo].[COURSE] ([C#], [CNAME], [T#]) VALUES (122, N'化学2', N'61')
INSERT [dbo].[COURSE] ([C#], [CNAME], [T#]) VALUES (123, N'政治1', N'50')
INSERT [dbo].[COURSE] ([C#], [CNAME], [T#]) VALUES (124, N'政治2', N'54')
INSERT [dbo].[COURSE] ([C#], [CNAME], [T#]) VALUES (125, N'历史1', N'58')
INSERT [dbo].[COURSE] ([C#], [CNAME], [T#]) VALUES (126, N'历史2', N'53')
INSERT [dbo].[COURSE] ([C#], [CNAME], [T#]) VALUES (127, N'地理1', N'56')
INSERT [dbo].[COURSE] ([C#], [CNAME], [T#]) VALUES (128, N'地理2', N'60')

View Code

二、表的数据截图

1、学生表：学号、姓名、姓别

2、教师表：编号，名称

3、课程表：课程编号、课程、老师编号

4、分数表：学号、课程号、分数

5、数据准备好后正式开始题目

--1、查询“111”课程比“112”课程成绩高的所有学生的学号；
/* EXISTS 版本 */
SELECT t1.s# FROM sc t1 WHERE t1.c# = 111 AND EXISTS ( SELECT 1 FROM sc t2 WHERE t2.c# = 112 AND t1.s# = t2.s# --要求同一个学生 所以有t1.s# = t2.s# AND t1.score > t2.score ); /* 子查询版本 */ SELECT a.s# FROM (SELECT t1.s#,t1.score FROM sc t1 WHERE t1.c# = 111) a INNER JOIN (SELECT t2.s#,t2.score FROM sc t2 WHERE t2.c# = 112) b ON a.s# = b.s# WHERE a.score > b.score; --2、查询平均成绩大于60分的同学的学号和平均成绩； SELECT t1.s# AS ST_CODE, AVG(t1.score) AS CU_AVG FROM sc t1 GROUP BY t1.s# HAVING AVG(t1.score) > 60 --3、查询所有同学的学号、姓名、选课数、总成绩； /* group by 的时候要注意选出来的字段是不是都是聚合函数或者分组的字段 */ SELECT t1.s# AS ST_DOCE, MIN(t1.sname) AS ST_NAME, COUNT(t2.c#) AS CU_NUM, SUM(t2.score) AS CU_SUM FROM STUDENT t1 LEFT JOIN SC t2 ON t1.s# = t2.s# GROUP BY t1.s# --4、查询姓“李”的老师的个数； SELECT COUNT(t1.t#) AS 李_NUM FROM teacher t1 WHERE t1.tname LIKE '李%' --5、查询没学过'陈奕迅'老师课的同学的学号、姓名； /* 一对多关系的就会出现比较坑爹的情况，记得用distinct并且要考虑是不是要做一个子查询 */ /* 当正面来可能比较困难的时候就要反方面来进行 */ /* EXISTS版 */ SELECT t5.s# AS ST_CODE, t5.sname AS ST_NAME FROM student t5 WHERE NOT EXISTS ( SELECT 1 FROM ( SELECT DISTINCT t1.s# AS ST_CODE, t1.sname AS ST_NAME, t4.tname FROM student t1 LEFT JOIN sc t2 ON t1.s# = t1.s# LEFT JOIN course t3 ON t2.c# = t3.c# LEFT JOIN teacher t4 ON t3.t# = t4.t# WHERE t4.tname = '陈奕迅' ) WHERE s# = t5.s# ); /* 子查询版 */ SELECT t5.s# AS ST_CODE, t5.sname AS ST_NAME FROM student t5 WHERE t5. EXISTS ( SELECT 1 FROM ( SELECT DISTINCT t1.s# AS ST_CODE, t1.sname AS ST_NAME, t4.tname FROM student t1 LEFT JOIN sc t2 ON t1.s# = t1.s# LEFT JOIN course t3 ON t2.c# = t3.c# LEFT JOIN teacher t4 ON t3.t# = t4.t# WHERE t4.tname = '陈奕迅' ) WHERE s# = t5.s# ); --6、查询学过“001”并且也学过编号“002”课程的同学的学号、姓名； --不能在where条件下面写WHERE t2.c# = 111 and t2.c# = 112 因为是对应同一条记录的 SELECT DISTINCT t1.s#,t1.sname FROM student t1 LEFT JOIN sc t2 ON t1.s# = t2.s# WHERE t2.c# = 111 INTERSECT --集合的交集 SELECT DISTINCT t1.s#,t1.sname FROM student t1 LEFT JOIN sc t2 ON t1.s# = t2.s# WHERE t2.c# = 112 --7、查询学过“叶平”老师所教的所有课的同学的学号、姓名； SELECT DISTINCT t1.s# AS ST_CODE, t1.sname AS ST_NAME, FROM student t1 LEFT JOIN sc t2 ON t1.s# = t1.s# LEFT JOIN course t3 ON t2.c# = t3.c# LEFT JOIN teacher t4 ON t3.t# = t4.t# WHERE t4.tname = '李冰冰' --8、查询课程编号“002”的成绩比课程编号“001”课程低的所有同学的学号、姓名； /* 用单纯的join版 */ /* 用了子查询 */ SELECT a.s# FROM (SELECT t1.s#,t1.score FROM sc t1 WHERE t1.c# = 111) a INNER JOIN (SELECT t2.s#,t2.score FROM sc t2 WHERE t2.c# = 112) b ON a.s# = b.s# WHERE a.score < b.score --9、查询所有课程成绩小于60分的同学的学号、姓名； SELECT T1.S#, T1.SNAME FROM STUDENT T1 INNER JOIN SC T2 ON T1.S# = T2.S# WHERE T2.C# < 60 --10、查询没有学全所有课的同学的学号、姓名； /*子查询版*/ SELECT DISTINCT t1.s#,t1.sname FROM student t1 INNER JOIN SC t2 ON t1.s# = t2.s# WHERE t2.c# IN ( SELECT t3.c# FROM Course t3 ) /*exists版*/ SELECT DISTINCT t1.s#,t1.sname FROM student t1 INNER JOIN SC t2 ON t1.s# = t2.s# WHERE EXISTS ( SELECT 1 FROM Course t3 WHERE t3.c# = t2.c# ) --11、查询至少有一门课与学号为“1001”的同学所学相同的同学的学号和姓名； /* 子查询 */ SELECT DISTINCT t1.s#,t1.sname FROM student t1 INNER JOIN sc t2 ON t1.s# = t2.s# WHERE t2.c# IN ( SELECT t4.c# FROM student t3 INNER JOIN sc t4 ON t3.s# = t4.s# WHERE t3.s# = 1 ) /* exists版 */ SELECT DISTINCT t1.s#,t1.sname FROM student t1 INNER JOIN sc t2 ON t1.s# = t2.s# WHERE EXISTS ( SELECT 1 FROM student t3 INNER JOIN sc t4 ON t3.s# = t4.s# WHERE t4.c# = t2.c# AND t3.s# = 1 ) --12、查询至少学过学号为“001”同学所有一门课的其他同学学号和姓名； /* 子查询 */ SELECT DISTINCT t1.s#,t1.sname FROM student t1 INNER JOIN sc t2 ON t1.s# = t2.s# AND t1.s# <> 1 WHERE t2.c# IN ( SELECT t4.c# FROM student t3 INNER JOIN sc t4 ON t3.s# = t4.s# WHERE t3.s# = 1 ) /* exists版 */ SELECT DISTINCT t1.s#,t1.sname FROM student t1 INNER JOIN sc t2 ON t1.s# = t2.s# AND t1.s# <> 1 WHERE EXISTS ( SELECT 1 FROM student t3 INNER JOIN sc t4 ON t3.s# = t4.s# WHERE t4.c# = t2.c# AND t3.s# = 1 ) --13、把“SC”表中“叶平”老师教的课的成绩都更改为此课程的平均成绩； UPDATE sc t4 SET t4.score = ( WITH tmp AS ( SELECT t1.c#, AVG(t1.score) AS avg_score FROM sc t1 INNER JOIN Course t2 ON t1.c# = t2.c# INNER JOIN teacher t3 ON t2.t# = t3.t# GROUP BY t1.c# ) SELECT t5.avg_score FROM tmp t5 WHERE t4.c# = t5.c# ) WHERE EXISTS ( SELECT 1 FROM sc t6 INNER JOIN Course t7 ON t6.c# = t7.c# INNER JOIN teacher t8 ON t7.t# = t8.t# AND t8.tname = '陈奕迅' ) 14、查询和“1002”号的同学学习的课程完全相同的其他同学学号和姓名； SELECT DISTINCT t1.s#, t1.sname FROM student t1 INNER JOIN sc t2 ON t1.s# = t2.s# AND t2.c# = ALL ( SELECT t4.c# FROM student t3 INNER JOIN sc t4 ON t3.s# = t4.s# AND t4.s# = 7 ) AND t1.s# <> 7 --15、删除学习'陈奕迅'老师课的SC表记录； DELETE FROM sc t1 WHERE EXISTS ( SELECT 1 FROM teacher t2 INNER JOIN Course t3 ON t2.t# = t3.t# WHERE t3.c# = t1.c# AND t2.tname = '陈奕迅' ) 16、向SC表中插入一些记录，这些记录要求符合以下条件：没有上过编号“003”课程的同学学号、2号课的平均成绩； INSERT INTO sc(s#,c#,score) SELECT min(t5.s#),112,AVG(t4.score) FROM sc t4 INNER JOIN student t5 ON t4.s# = t5.s# WHERE t4.s# NOT IN ( SELECT t2.s# FROM student t2 INNER JOIN sc t3 ON t2.s# = t3.s# AND t3.c# = 113 ) AND t4.c# = 112 GROUP BY t4.c# --17、按平均成绩从高到低显示所有学生的“语文1”、“生物2”、“化学1”三门的课程成绩，按如下形式显示： 学生ID,,数据库,企业管理,英语,有效课程数,有效平均分 /* 行转列除了可以用poivt外还可以分别select出来，再和主表的字段关联 */ SELECT t1.S# as 学生ID, (SELECT score FROM SC t2 WHERE t2.S#=t1.S# AND t2.C#=111) AS 语文1, (SELECT score FROM SC t3 WHERE t3.S#=t1.S# AND t3.C#=118) AS 生物2, (SELECT score FROM SC t4 WHERE t4.S#=t1.S# AND t4.C#=121) AS 化学1, COUNT(*) AS 有效课程数, AVG(t1.score) AS 平均成绩 FROM SC t1 GROUP BY t1.S# ORDER BY avg(t1.score) --18、查询各科成绩最高和最低的分：以如下形式显示：课程ID，最高分，最低分 SELECT t1.c#, MIN(t1.score) AS min_score, MAX(t1.score) AS max_score FROM sc t1 GROUP BY t1.c# --19、按各科平均成绩从低到高和及格率的百分数从高到低顺序 SELECT t1.c#, AVG(t1.score) AS avg_score, 100 * SUM( CASE WHEN nvl(t1.score,0)>=60 THEN 1 ELSE 0 END )/COUNT(*) AS pass_pct FROM sc t1 GROUP BY t1.c# ORDER BY avg_score ASC,pass_pct DESC --20、查询如下课程平均成绩和及格率的百分数(用"1行"显示): 语文1（111），语文2（112），数学1（113），数学2（114） SELECT SUM(CASE WHEN t1.c# =111 THEN score ELSE 0 END)/SUM(CASE t1.c# WHEN 111 THEN 1 ELSE 0 END) AS 语文1 , 100 * SUM(CASE WHEN t1.c# = 111 AND score >= 60 THEN 1 ELSE 0 END)/SUM(CASE WHEN t1.c# = 111 THEN 1 ELSE 0 END) AS 语文1及格百分比 , SUM(CASE WHEN t1.c# = 112 THEN score ELSE 0 END)/SUM(CASE t1.c# WHEN 112 THEN 1 ELSE 0 END) AS 语文2 , 100 * SUM(CASE WHEN t1.c# = 112 AND score >= 60 THEN 1 ELSE 0 END)/SUM(CASE WHEN t1.c# = 112 THEN 1 ELSE 0 END) AS 语文2及格百分比 , SUM(CASE WHEN t1.c# = 113 THEN score ELSE 0 END)/SUM(CASE t1.c# WHEN 113 THEN 1 ELSE 0 END) AS 数学1 , 100 * SUM(CASE WHEN t1.c# = 113 AND score >= 60 THEN 1 ELSE 0 END)/SUM(CASE WHEN t1.c# = 113 THEN 1 ELSE 0 END) AS 数学1及格百分比 , SUM(CASE WHEN t1.c# = 114 THEN score ELSE 0 END)/SUM(CASE t1.c# WHEN 114 THEN 1 ELSE 0 END) AS 数学2 , 100 * SUM(CASE WHEN t1.c# = 114 AND score >= 60 THEN 1 ELSE 0 END)/SUM(CASE WHEN t1.c# = 114 THEN 1 ELSE 0 END) AS 数学2及格百分比 FROM SC t1 --21、查询不同老师所教不同课程平均分从高到低显示 SELECT t3.tname, t2.cname, AVG(t1.score) AS avg_score FROM sc t1 INNER JOIN course t2 ON t1.c# = t2.c# INNER JOIN teacher t3 ON t2.t# = t3.t# GROUP BY t3.tname,t2.cname ORDER BY avg_score DESC --22、查询如下课程成绩第 3 名到第 6 名的学生成绩单：企业管理（111），马克思（112），UML （113），数据库（114） SELECT sub_query.cname, sub_query.rank FROM( SELECT t2.cname, t1.score, rank() over(PARTITION BY t1.c# ORDER BY t1.score DESC) AS rank FROM sc t1 INNER JOIN course t2 ON t1.c# = t2.c# WHERE t1.c# IN (111,112,113,114) ) sub_query WHERE sub_query.rank BETWEEN 3 AND 6; --23、统计列印各科成绩,各分数段人数:课程ID,课程名称,[100-85] 优秀人数,[85-70] 良好人数,[70-60] 一般人数,[ <60] 刚及格人数 SELECT t1.c#, t2.cname, SUM(CASE WHEN t1.score > 85 AND t1.score <= 100 THEN 1 ELSE 0 END) AS 优秀人数, SUM(CASE WHEN t1.score > 70 AND t1.score <= 85 THEN 1 ELSE 0 END) AS 良好人数, SUM(CASE WHEN t1.score > 60 AND t1.score <= 70 THEN 1 ELSE 0 END) AS 一般人数, SUM(CASE WHEN t1.score <= 60 THEN 1 ELSE 0 END) AS 刚及格人数 FROM sc t1 INNER JOIN course t2 ON t1.c# = t2.c# GROUP BY t1.c#,t2.cname --24、查询学生平均成绩及其名次 SELECT t1.sname, t1.s#, AVG(t2.score) AS avg_score, dense_rank() over(ORDER BY AVG(t2.score) DESC) AS dense_rank FROM student t1 INNER JOIN sc t2 ON t1.s# = t2.s# GROUP BY t1.sname,t1.s# --25、查询各科成绩前三名的记录:(不考虑成绩并列情况) SELECT sub_query.cname, sub_query.s#, sub_query.sname, sub_query.score, sub_query.rank FROM ( SELECT t3.cname, t1.s#, t1.sname, t2.score, rank() over(PARTITION BY t2.c# ORDER BY t2.score DESC) AS rank FROM student t1 INNER JOIN sc t2 ON t1.s# = t2.s# INNER JOIN course t3 ON t2.c# = t3.c# ) sub_query WHERE sub_query.rank < 4 --26、查询每门课程被选修的学生数 SELECT t2.cname, COUNT(t1.s#) AS sum_stu FROM sc t1 INNER JOIN course t2 ON t1.c# = t2.c# GROUP BY t2.cname --27、查询出只选修了一门课程的全部学生的学号和姓名  /* GROUP BY 语句中选择出来的只有备份组的字段和聚合函数 */ SELECT t1.s#, t1.sname FROM student t1 INNER JOIN sc t2 ON t1.s# = t2.s# GROUP BY t1.s#,t1.sname HAVING COUNT(t2.c#) = 1 --28、查询男生、女生人数 SELECT t1.ssex, COUNT(t1.ssex) AS sex_num FROM student t1 GROUP BY t1.ssex --29、查询名字中有'黑'的学生名单 SELECT t1.s#, t1.sname FROM student t1 WHERE t1.sname LIKE '%黑%' --30、查询同名同性学生名单，并统计同名人数 /* 写了个错的 原因：student表中有两个小粉，on条件只是县限定了sname相等，所以导致了2X2的笛卡尔乘积*/ SELECT t1.sname, COUNT(t1.s#) AS same_name_count FROM student t1 INNER JOIN student t2 ON t1.sname = t2.sname GROUP BY t1.sname,t2.sname HAVING COUNT(t1.sname) > 1 /* 正确的写法 */ SELECT t1.sname, COUNT(t1.sname) AS same_name_count FROM student t1 GROUP BY t1.sname HAVING COUNT(t1.sname) > 1 --32、查询每门课程的平均成绩，结果按平均成绩升序排列，平均成绩相同时，按课程号降序排列 SELECT t2.cname, t2.c#, AVG(t1.score) AS avg_score FROM sc t1 INNER JOIN course t2 ON t1.c# = t2.c# GROUP BY t2.cname,t2.c# ORDER BY avg_score ASC,t2.c# DESC --33、查询平均成绩大于85的所有学生的学号、姓名和平均成绩 SELECT t1.s#, t1.sname, AVG(t2.score) AS avg_score FROM student t1 INNER JOIN sc t2 ON t1.s# = t2.s# GROUP BY t1.s#,t1.sname HAVING AVG(t2.score) > 85 --34、查询课程名称为'语文1'，且分数低于60的学生姓名和分数 SELECT t1.sname, t2.score FROM student t1 INNER JOIN sc t2 ON t1.s# = t2.s# INNER JOIN course t3 ON t2.c# = t3.c# WHERE t3.cname = '语文1' AND t2.score < 60 --35、查询所有学生的选课情况； /* 可能不是这样写，有更好的写法 */ SELECT t1.s#, t1.sname, t3.cname FROM student t1 INNER JOIN sc t2 ON t1.s# = t2.s# INNER JOIN course t3 ON t2.c# = t3.c# --36、查询任何一门课程成绩在70分以上的姓名、课程名称和分数； SELECT t1.s#, t1.sname, t3.cname, t2.score FROM student t1 INNER JOIN sc t2 ON t1.s# = t2.s# INNER JOIN course t3 ON t2.c# = t3.c# WHERE t2.score > 70 --37、查询不及格的课程，并按课程号从大到小排列 SELECT t1.c#, t2.cname, t1.score FROM sc t1 INNER JOIN course t2 ON t1.c# = t2.c# WHERE t1.score < 60 ORDER BY t1.c# DESC --38、查询课程编号为003且课程成绩在80分以上的学生的学号和姓名； SELECT t1.s#, t1.sname, t2.score FROM student t1 INNER JOIN sc t2 ON t1.s# = t2.s# INNER JOIN course t3 ON t2.c# = t3.c# WHERE t2.c# = 113 AND t2.score > 80 --39、求选了课程的学生人数 SELECT SUM(1) FROM ( SELECT 1 FROM sc t1 GROUP BY t1.s# ) --40、查询选修“叶平”老师所授课程的学生中，成绩最高的学生姓名及其成绩 SELECT t4.s#, t4.sname, t5.score, t6.cname FROM student t4 INNER JOIN sc t5 ON t4.s# = t5.s# INNER JOIN course t6 ON t5.c# = t6.c# WHERE (t5.score,t6.cname) IN ( SELECT MAX(t1.score), t2.cname FROM sc t1 INNER JOIN course t2 ON t1.c# = t2.c# INNER JOIN teacher t3 ON t2.t# = t3.t# WHERE t3.tname = '陈奕迅' GROUP BY t2.cname ) --41、查询各个课程及相应的选修人数 SELECT t1.c#, t2.cname, COUNT(t1.s#) FROM sc t1 INNER JOIN course t2 ON t1.c# = t2.c# GROUP BY t1.c#,t2.cname --42、查询不同课程成绩相同的学生的学号、课程号、学生成绩 SELECT t1.s#, t1.c#, t1.score FROM sc t1 INNER JOIN sc t2 ON t1.score = t2.score AND t1.c# <> t2.c# AND t1.s# = t2.s# --43、查询每门功成绩最好的前两名 SELECT sub_query.s#, sub_query.sname, sub_query.cname, sub_query.score, sub_query.rank FROM ( SELECT t1.s#, t3.sname, t2.cname, t1.score, dense_rank() over(PARTITION BY t1.c# ORDER BY t1.score DESC) AS rank FROM sc t1 INNER JOIN course t2 ON t1.c# = t2.c# INNER JOIN student t3 ON t1.s# = t3.s# ) sub_query WHERE sub_query.rank < 3 --44、统计每门课程的学生选修人数（超过10人的课程才统计）。要求输出课程号和选修人数，查询结果按人数降序排列，查询结果按人数降序排列，若人数相同，按课程号升序排列 SELECT t1.c#, COUNT(t1.s#) AS stu_num FROM sc t1 GROUP BY t1.c# HAVING COUNT(t1.s#) > 10 ORDER BY stu_num DESC,t1.c# ASC --45、检索至少选修两门课程的学生学号 SELECT t1.s# FROM sc t1 GROUP BY t1.s# HAVING COUNT(t1.c#) > 1 --46、查询全部学生都选修的课程的课程号和课程名 SELECT t1.c#, t2.cname, COUNT(t1.s#) FROM sc t1 INNER JOIN course t2 ON t1.c# = t2.c# GROUP BY t1.c#,t2.cname HAVING COUNT(t1.s#) = ( SELECT COUNT(t3.s#) FROM student t3 ) --47、查询没学过'陈奕迅'老师讲授的任一门课程的学生姓名 SELECT t5.s#, t5.sname FROM student t5 WHERE t5.s# NOT IN ( SELECT DISTINCT t1.s# FROM student t1 INNER JOIN sc t2 ON t1.s# = t2.s# INNER JOIN course t3 ON t2.c# = t3.c# INNER JOIN teacher t4 ON t3.t# = t4.t# WHERE t4.tname = '陈奕迅' ) --48、查询两门以上不及格课程的同学的学号及其平均成绩 /* 不能直接用下面的方式，因为有where条件过滤了一部分的成绩 SELECT t1.s#, AVG(t1.score) FROM sc t1 WHERE t1.score < 60 GROUP BY t1.s# HAVING COUNT(t1.c#) > 2 */ SELECT t2.s#, AVG(t2.score) FROM sc t2 WHERE t2.s# IN ( SELECT t1.s# FROM sc t1 WHERE t1.score < 60 GROUP BY t1.s# HAVING COUNT(t1.c#) > 2 ) GROUP BY t2.s# --49、检索'114'课程分数小于60，按分数降序排列的同学学号 SELECT t1.s# FROM sc t1 WHERE t1.c# = 114 AND t1.score < 60 ORDER BY t1.s# DESC --50、删除'2'同学的'111'课程的成绩 DELETE FROM sc t1 WHERE t1.s# = 2 AND t1.c# = 111

面试题 数据库sql

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