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CREATE DATABASE REVIEW ON PRIMARY ( NAME = 'FILE1', FILENAME = 'D:\SQLDATA\F1.MDF', SIZE = 50MB, MAXSIZE = UNLIMITED, FILEGROWTH = 10MB ), FILEGROUP GROUP2 ( NAME = 'FILE2', FILENAME = 'D:\SQLDATA\F2.NDF', SIZE = 20MB, MAXSIZE = UNLIMITED, FILEGROWTH = 20% ), ( NAME = 'FILE3', FILENAME = 'D:\SQLDATA\F3.NDF', SIZE = 20MB, MAXSIZE = UNLIMITED, FILEGROWTH = 20% ) LOG ON ( NAME = 'LOG1', FILENAME = 'D:\SQLDATA\L1.LDF', SIZE = 10MB, MAXSIZE = UNLIMITED, FILEGROWTH = 5MB )
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ALTER DATABASE REVIEW MODIFY FILE ( NAME = 'FILE1', SIZE = 200MB, MAXSIZE = 200MB, FILEGROWTH = 5MB ) ALTER DATABASE REVIEW ADD FILE ( NAME = 'FILEADD', FILENAME = 'D:\SQLDATA\F3.NDF', SIZE = 20MB, MAXSIZE = 100MB, FILEGROWTH = 5MB )
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sp_attach_db '数据库名','数据文件名(*.mdf注意要带目录)'
--后面可以是用,分隔的该数据库的多个数据文件,'日志文件名(*.ldf注意要带目录)'
--后面可以是用,分隔的该数据库的多个日志文件
EXEC sp_detach_db 'SMC202015086'
EXEC sp_attach_db @DBNAME = 'ATTACHTEST',
@FILENAME1 = 'D:\SQLDB\SMC.MDF',
@FILENAME2 = 'D:\SQLDB\SMC.LDF'
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--学生表 CREATE TABLE Student( sid VARCHAR(20), sname VARCHAR(20) NOT NULL DEFAULT '', sbirth VARCHAR(20) NOT NULL DEFAULT '', ssex VARCHAR(10) NOT NULL DEFAULT '', PRIMARY KEY(sid) ); --课程表 CREATE TABLE Course( cid VARCHAR(20), cname VARCHAR(20) NOT NULL DEFAULT '', tid VARCHAR(20) NOT NULL, PRIMARY KEY(cid) ); --教师表 CREATE TABLE Teacher( tid VARCHAR(20), tname VARCHAR(20) NOT NULL DEFAULT '', PRIMARY KEY(tid) ); --成绩表 CREATE TABLE Score( sid VARCHAR(20), cid VARCHAR(20), score INT, PRIMARY KEY(sid,cid) );
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USE REVIEW
ALTER TABLE COURSE
ALTER COLUMN CNAME VARCHAR(20) NULL
USE REVIEW
ALTER TABLE COURSE
ADD COURSEINFO VARCHAR(20) NULL
USE REVIEW
ALTER TABLE COURSE
DROP COLUMN COURSEINFO
DROP TABLE TABLE_NAME
INSERT
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--插入学生表测试数据 insert into Student values('01' , '赵雷' , '1990-01-01' , '男'); insert into Student values('02' , '钱电' , '1990-12-21' , '男'); insert into Student values('03' , '孙风' , '1990-05-20' , '男'); insert into Student values('04' , '李云' , '1990-08-06' , '男'); insert into Student values('05' , '周梅' , '1991-12-01' , '女'); insert into Student values('06' , '吴兰' , '1992-03-01' , '女'); insert into Student values('07' , '郑竹' , '1989-07-01' , '女'); insert into Student values('08' , '王菊' , '1990-01-20' , '女'); --课程表测试数据 insert into Course values('01' , '语文' , '02'); insert into Course values('02' , '数学' , '01'); insert into Course values('03' , '英语' , '03'); --教师表测试数据 insert into Teacher values('01' , '张三'); insert into Teacher values('02' , '李四'); insert into Teacher values('03' , '王五'); --成绩表测试数据 insert into Score values('01' , '01' , 80); insert into Score values('01' , '02' , 90); insert into Score values('01' , '03' , 99); insert into Score values('02' , '01' , 70); insert into Score values('02' , '02' , 60); insert into Score values('02' , '03' , 80); insert into Score values('03' , '01' , 80); insert into Score values('03' , '02' , 80); insert into Score values('03' , '03' , 80); insert into Score values('04' , '01' , 50); insert into Score values('04' , '02' , 30); insert into Score values('04' , '03' , 20); insert into Score values('05' , '01' , 76); insert into Score values('05' , '02' , 87); insert into Score values('06' , '01' , 31); insert into Score values('06' , '03' , 34); insert into Score values('07' , '02' , 89); insert into Score values('07' , '03' , 98);
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USE REVIEW
UPDATE STUDENT
SET SSEX = '女'
WHERE SID = 01
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DELETE STUDENT
WHERE SID = 01
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SELECT SID,SSEX
FROM STUDENT
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SELECT *
FROM STUDENT
SELECT '学号' = SID,'姓名' = SNAME
FROM STUDENT
SELECT '学号' = SID + 10,'姓名' = SNAME
FROM STUDENT
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SELECT '学号' = SID + 10,'性别' =
CASE SSEX
WHEN '男' THEN 1
WHEN '女' THEN 0
END
FROM STUDENT
DISTINCT 只能出现一次,且在所有列名之前。只能消除完全重复的行
TOP 因该在DISTINCT之后
SELECT DISTINCT '学号' = SID + 10,'性别' =
CASE SSEX
WHEN '男' THEN 1
WHEN '女' THEN 0
END
FROM STUDENT
SELECT DISTINCT TOP 5 '学号' = SID + 10,'性别' = SSEX
FROM STUDENT
SELECT DISTINCT TOP 5 PERCENT '学号' = SID + 10,'性别' = SSEX
FROM STUDENT
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SELECT A.SID,SNAME,SBIRTH,SSEX,CID,SCORE
FROM STUDENT A,SCORE B
WHERE A.SID = B.SID
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SELECT fields
FROM 表1 INNER JOIN
(表2 INNER JOIN [( ]表3
[INNER JOIN [( ] 表x [INNER JOIN ...)]
ON 表3.字段3 比较运算子 表x.字段x)]
ON 表2.字段2 比较运算子 表3.字段3)
ON 表1.字段1 比较运算子 表2.字段2
SELECT A.SID,B.cid,C.cname
FROM COURSE C LEFT JOIN SCORE B JOIN STUDENT A
ON B.SID = A.SID
ON C.CID = B.CID
SELECT SUM(SCORE) AS '总分',AVG(SCORE) AS '平均分',MAX(SCORE) AS '最高分',MIN(SCORE) AS '最低分'
FROM SCORE
WHERE CID = 01
SELECT A.SNAME,D.CNAME,A.SBIRTH
FROM STUDENT A JOIN SCORE C JOIN COURSE D
ON C.CID = D.CID AND C.CID = 01
ON C.SID = A.SID
ORDER BY SBIRTH
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SELECT CID AS '课程号',SUM(SCORE) AS '总分',AVG(SCORE) AS '平均分'
FROM SCORE
GROUP BY CID
ORDER BY AVG(SCORE) DESC
!!!!先算GROUP 再算ORDER
ALTER TABLE STUDENT
ADD [CONSTRAINT A] UNIQUE(SNAME)
ALTER TABLE SCORE
ADD [CONSTRAINT A] PRIMARY KEY(SID,CID)
ALTER TABLE STUDENT
ADD DEFAULT '男' FOR SSEX
ALTER TABLE STUDENT
ADD CHECK(SSEX = '男' OR SSEX = '女')
ALTER TABLE SCORE
ADD FOREIGN KEY(SID) REFERENCES STUDENT(SID)
ALTER TABLE SCORE
ADD FOREIGN KEY(CID) REFERENCES COURSE(CID)
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CREATE VIEW STSC(学号,姓名,课程,分数)
AS
SELECT A.SID,A.SNAME,B.CNAME,C.SCORE
FROM STUDENT A,COURSE B,SCORE C
WHERE A.SID = C.SID AND
B.CID = C.CID
SELECT *
FROM STSC
WHERE 分数 > 60
删除视图
DROP VIEW VIEWNAME
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CREATE FUNCTION MYSUM
(@I INT,@J INT)
RETURNS INT
AS
BEGIN
DECLARE @S INT
SET @S = @I + @J
RETURN @S
END
DECLARE @M INT ,@N INT
SET @M = 1
SET @N = 2
SELECT DBO.MYSUM(@M,@N)
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CREATE FUNCTION SEEK
(@CID INT)
RETURNS TABLE
AS
RETURN
(
SELECT CID,CNAME
FROM COURSE
WHERE CID = @CID
)
SELECT *
FROM DBO.SEEK(01)
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CREATE FUNCTION SEEKS2(@CNAME VARCHAR(20)) RETURNS @SCORE TABLE ( STUID INT PRIMARY KEY NOT NULL, SEX VARCHAR(20) NOT NULL, BIRTH VARCHAR(20) ) AS BEGIN INSERT @SCORE SELECT SID,SSEX,SBIRTH FROM STUDENT WHERE SID IN( SELECT SID FROM COURSE WHERE CNAME = @CNAME ) RETURN END SELECT * FROM DBO.SEEKS('语文') 重命名和删除 EXEC SP_RENAME 'DBO.SEEK2','DBO.SEEKK' DROP FUNCTION DBO.SEEK2
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CREATE PROC ADDD
@CID INT,
@AV INT OUTPUT
AS
SET @AV =
(
SELECT AVG(SCORE)
FROM SCORE
WHERE CID = @CID
)
--调用
DECLARE @AV INT
EXEC DBO.ADDD '01',@AV OUTPUT
PRINT '平均分是' + STR(@AV)
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删除
EXEC SP_RENAME ‘DBO.SEEK2’,‘DBO.SEEKK’
DROP FUNCTION DBO.SEEK2
## 七、存储过程、触发器、游标 ### 7.1 存储过程 [外链图片转存中...(img-ohbnwWYZ-1655867492608)] ```sql CREATE PROC ADDD @CID INT, @AV INT OUTPUT AS SET @AV = ( SELECT AVG(SCORE) FROM SCORE WHERE CID = @CID ) --调用 DECLARE @AV INT EXEC DBO.ADDD '01',@AV OUTPUT PRINT '平均分是' + STR(@AV)
[外链图片转存中…(img-XZVdBbDq-1655867492609)]
[外链图片转存中…(img-ByjaFKtl-1655867492609)]
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