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(1) SELECT * FROM S WHERE A=10
(2) SELECT A,B FROM S
(3) SELECT A,B,S.C,D,E,F FROM S,T WHERE S.C=T.C AND S.D=T.D
(4) SELECT * FROM S,T WHERE S.C=T.C
(5) SELECT * FROM S,T WHERE S.A<T.E
(6) SELECT ST.C,ST.D,T.C,T.D,E,F FROM T,(SELECT DISTINCT C,D FROM S) AS ST
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设æä¸ä¸ªSPJæ°æ®åºï¼å æ¬SãPãJãSPJ 4ä¸ªå ³ç³»æ¨¡å¼ã
Sï¼SNOï¼SNAMEï¼STATUSï¼CITYï¼
Pï¼PNOï¼PNAMEï¼COLORï¼WEIGHTï¼
Jï¼JNOï¼JNAMEï¼CITYï¼
SPJï¼SNOï¼PNOï¼JNOï¼QTYï¼
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CREATE TABLE `s` (
`SNO` VARCHAR(10) NOT NULL COMMENT 'ä¾åºå代ç ',
`SNAME` VARCHAR(10) NOT NULL COMMENT 'ä¾åºåå§å',
`STATUS` INT NOT NULL COMMENT 'ä¾åºåç¶æ',
`CITY` VARCHAR(10) DEFAULT NULL COMMENT 'ä¾åºåæå¨åå¸',
PRIMARY KEY (`SNO`)
) ENGINE=INNODB DEFAULT CHARSET=utf8mb3
CREATE TABLE `p` (
`PNO` VARCHAR(10) NOT NULL COMMENT 'é¶ä»¶ä»£ç ',
`PNAME` VARCHAR(10) NOT NULL COMMENT 'é¶ä»¶å',
`COLOR` VARCHAR(2) DEFAULT NULL COMMENT 'é¢è²',
`WEIGHT` INT NOT NULL COMMENT 'éé',
PRIMARY KEY (`PNO`),
CONSTRAINT `p_chk_1` CHECK ((`WEIGHT` >= 0))
) ENGINE=INNODB DEFAULT CHARSET=utf8mb3
CREATE TABLE `j` (
`JNO` VARCHAR(10) NOT NULL COMMENT 'å·¥ç¨é¡¹ç®ä»£ç ',
`JNAME` VARCHAR(10) NOT NULL COMMENT 'å·¥ç¨é¡¹ç®å',
`CITY` VARCHAR(10) DEFAULT NULL COMMENT 'å·¥ç¨é¡¹ç®æå¨åå¸',
PRIMARY KEY (`JNO`)
) ENGINE=INNODB DEFAULT CHARSET=utf8mb3
CREATE TABLE `spj` (
`SNO` VARCHAR(10) NOT NULL COMMENT 'ä¾åºå代ç ',
`PNO` VARCHAR(10) NOT NULL COMMENT 'é¶ä»¶ä»£ç ',
`JNO` VARCHAR(10) NOT NULL COMMENT 'å·¥ç¨é¡¹ç®ä»£ç ',
`QTY` INT DEFAULT NULL COMMENT 'ä¾åºæ°é',
PRIMARY KEY (`SNO`,`PNO`,`JNO`),
KEY `PNO` (`PNO`),
KEY `JNO` (`JNO`),
CONSTRAINT `spj_ibfk_1` FOREIGN KEY (`SNO`) REFERENCES `s` (`SNO`),
CONSTRAINT `spj_ibfk_2` FOREIGN KEY (`PNO`) REFERENCES `p` (`PNO`),
CONSTRAINT `spj_ibfk_3` FOREIGN KEY (`JNO`) REFERENCES `j` (`JNO`),
CONSTRAINT `spj_chk_1` CHECK ((`QTY` >= 0))
) ENGINE=INNODB DEFAULT CHARSET=utf8mb3
模ææ°æ®
æ¥èªââ第äºç« ä½ä¸ãæ°æ®åºåçãââ
![](https://img.laitimes.com/img/_0nNw4CM6IyYiwiM6ICdiwiI0gTMx81dsQWZ4lmZf1GLlpXazVmcvwFciV2dsQXYtJ3bm9CX9s2RkBnVHFmb1clWvB3MaVnRtp1XlBXe0xCMy81dvRWYoNHLwEzX5xCMx8FesU2cfdGLwMzX0xiRGZkRGZ0Xy9GbvNGLpZTY1EmMZVDUSFTU4VFRR9Fd4VGdsYTMfVmepNHLrJXYtJXZ0F2dvwVZnFWbp1zczV2YvJHctM3cv1Ce-cmbw5yN1ADNyUTZyEjN4YGO1UjNzYzX2UDNyIDM1AzLcFTMyIDMy8CXn9Gbi9CXzV2Zh1WavwVbvNmLvR3YxUjLyM3Lc9CX6MHc0RHaiojIsJye.png)
# 模ææ°æ®
INSERT INTO S(SNO,SNAME,STATUS,CITY) VALUES('S1','ç²¾ç',10,'å京');
INSERT INTO S(SNO,SNAME,STATUS,CITY) VALUES('S2','ä¸æ¹çº¢',20,'天津');
INSERT INTO S(SNO,SNAME,STATUS,CITY) VALUES('S3','群ä¼',30,'å京');
INSERT INTO S(SNO,SNAME,STATUS,CITY) VALUES('S4','大ä¼',20,'ä¸æµ·');
INSERT INTO S(SNO,SNAME,STATUS,CITY) VALUES('S5','为æ°',30,'天津');
INSERT INTO P(PNO,PNAME,COLOR,WEIGHT) VALUES('P1','èºæ¯','红',13);
INSERT INTO P(PNO,PNAME,COLOR,WEIGHT) VALUES('P2','èºæ ','绿',16);
INSERT INTO P(PNO,PNAME,COLOR,WEIGHT) VALUES('P3','èºä¸å','è',15);
INSERT INTO P(PNO,PNAME,COLOR,WEIGHT) VALUES('P4','èºä¸å','红',15);
INSERT INTO P(PNO,PNAME,COLOR,WEIGHT) VALUES('P5','å¸è½®','è',30);
INSERT INTO P(PNO,PNAME,COLOR,WEIGHT) VALUES('P6','齿轮','红',25);
INSERT INTO J(JNO,JNAME,CITY) VALUES('J1','ä¸å»º','å京');
INSERT INTO J(JNO,JNAME,CITY) VALUES('J2','ä¸æ±½','é¿æ¥');
INSERT INTO J(JNO,JNAME,CITY) VALUES('J3','弹簧å','天津');
INSERT INTO J(JNO,JNAME,CITY) VALUES('J4','æºè½¦å','å京');
INSERT INTO J(JNO,JNAME,CITY) VALUES('J5','æ 线çµå','ç¦å·');
INSERT INTO J(JNO,JNAME,CITY) VALUES('J6','å导ä½å','ä¸æµ·');
INSERT INTO J(JNO,JNAME,CITY) VALUES('J7','éæºå','太å');
INSERT INTO SPJ(SNO,PNO,JNO,QTY) VALUES('S1','P1','J1',200);
INSERT INTO SPJ(SNO,PNO,JNO,QTY) VALUES('S1','P1','J2',100);
INSERT INTO SPJ(SNO,PNO,JNO,QTY) VALUES('S1','P1','J4',300);
INSERT INTO SPJ(SNO,PNO,JNO,QTY) VALUES('S1','P2','J3',200);
INSERT INTO SPJ(SNO,PNO,JNO,QTY) VALUES('S2','P3','J1',300);
INSERT INTO SPJ(SNO,PNO,JNO,QTY) VALUES('S2','P3','J2',500);
INSERT INTO SPJ(SNO,PNO,JNO,QTY) VALUES('S2','P3','J5',700);
INSERT INTO SPJ(SNO,PNO,JNO,QTY) VALUES('S2','P5','J1',300);
INSERT INTO SPJ(SNO,PNO,JNO,QTY) VALUES('S2', 'P5', 'J2',400);
INSERT INTO SPJ(SNO,PNO,JNO,QTY) VALUES('S3', 'P1', 'J1',100);
INSERT INTO SPJ(SNO,PNO,JNO,QTY) VALUES('S3', 'P3', 'J1',200);
INSERT INTO SPJ(SNO,PNO,JNO,QTY) VALUES('S4', 'P5', 'J1',400);
INSERT INTO SPJ(SNO,PNO,JNO,QTY) VALUES('S4', 'P5', 'J3',400);
INSERT INTO SPJ(SNO,PNO,JNO,QTY) VALUES('S4', 'P6', 'J4',200);
INSERT INTO SPJ(SNO,PNO,JNO,QTY) VALUES('S5', 'P2', 'J3',300);
INSERT INTO SPJ(SNO,PNO,JNO,QTY) VALUES('S5', 'P3', 'J1',100);
INSERT INTO SPJ(SNO,PNO,JNO,QTY) VALUES('S5', 'P6', 'J2',200);
INSERT INTO SPJ(SNO,PNO,JNO,QTY) VALUES('S5', 'P6', 'J5',400);
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Sï¼SNOï¼SNAMEï¼STATUSï¼CITYï¼
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Jï¼JNOï¼JNAMEï¼CITYï¼
SPJï¼SNOï¼PNOï¼JNOï¼QTYï¼
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ï¼5ï¼æ±è³å°ä½¿ç¨äºä¾åºåS1æä¾åºçå ¨é¨é¶ä»¶çå·¥ç¨å·JNOã
# 第3ç« ç¬¬4é¢ï¼SPJæ°æ®åºä¸å®ææ¥è¯¢ï¼
#ï¼1ï¼æ±ä¾åºå·¥ç¨J1é¶ä»¶çä¾åºåç¼å·SNOã
SELECT DISTINCT SNO
FROM SPJ;
WHERE JNO='J1';
# S1 S3 S5 S2 S4
#ï¼2ï¼æ±ä¾åºå·¥ç¨J1é¶ä»¶P1çä¾åºåç¼å·SNOã
SELECT DISTINCT SNO
FROM SPJ;
WHERE JNO='J1'
AND PNO='P1';
# S1 S3 S5 S2 S4
#ï¼3ï¼æ±ä¾åºå·¥ç¨J1é¶ä»¶ä¸ºçº¢è²çä¾åºåç¼å·SNOã
SELECT DISTINCT SNO
FROM SPJ
INNER JOIN P
ON SPJ.`PNO`=p.`PNO`
WHERE JNO='J1' AND COLOR='红';
#S1 S3
#ï¼4ï¼æ±æ²¡æ使ç¨å¤©æ´¥ä¾åºåç产ç红è²é¶ä»¶çå·¥ç¨å·JNOã
SELECT DISTINCT JNO
FROM SPJ
WHERE JNO NOT IN(
SELECT DISTINCT JNO
FROM SPJ
INNER JOIN S
ON SPJ.`SNO`=S.`SNO`
INNER JOIN P
ON SPJ.`PNO`=p.`PNO`
WHERE CITY='天津' AND COLOR='红'
);
#J1 J4 J3
#ï¼5ï¼æ±è³å°ä½¿ç¨äºä¾åºåS1æä¾åºçå
¨é¨é¶ä»¶çå·¥ç¨å·JNOã
SELECT DISTINCT JNO
FROM SPJ
WHERE NOT EXISTS
(SELECT *
FROM SPJ SPJZ
WHERE EXISTS
(SELECT * FROM SPJ SPJX
WHERE SPJX.`PNO`=SPJZ.`PNO` AND SPJX.`SNO`='S1')
AND NOT EXISTS(
SELECT * FROM SPJ SPJY
WHERE SPJY.JNO=SPJ.`JNO` AND SPJY.`PNO`=SPJZ.`PNO`)
)
#æ
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设æä¸ä¸ªSPJæ°æ®åºï¼å æ¬SãPãJãSPJ 4ä¸ªå ³ç³»æ¨¡å¼ã
Sï¼SNOï¼SNAMEï¼STATUSï¼CITYï¼
Pï¼PNOï¼PNAMEï¼COLORï¼WEIGHTï¼
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SPJï¼SNOï¼PNOï¼JNOï¼QTYï¼
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ï¼10ï¼ä»ä¾åºåå ³ç³»Sä¸å é¤S2çè®°å½ï¼å¹¶ä»ä¾åºæ åµå ³ç³»SPJä¸å é¤ç¸åºçè®°å½ï¼
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# 第3ç« ç¬¬5é¢ï¼SPJæ°æ®åºä¸å®æåç§æä½ï¼
#ï¼1ï¼æ¾åºææä¾åºåçå§ååæå¨åå¸ï¼
SELECT SNAME,CITY
FROM S;
#ï¼2ï¼æ¾åºææé¶ä»¶çå称ãé¢è²ãééï¼
SELECT PNAME,COLOR,WEIGHT
FROM P;
#ï¼3ï¼æ¾åºä½¿ç¨ä¾åºåS1æä¾é¶ä»¶çå·¥ç¨å·ç ï¼
SELECT DISTINCT JNO
FROM SPJ
WHERE SNO='S1';
#J1 J2 J4 J3
#ï¼4ï¼æ¾åºå·¥ç¨é¡¹ç®J2使ç¨çåç§é¶ä»¶çå称åå
¶æ°éï¼
SELECT DISTINCT PNAME,QTY
FROM SPJ
INNER JOIN P
ON SPJ.`PNO`=p.`PNO`
WHERE JNO='J2';
#ï¼5ï¼æ¾åºä¸æµ·ååä¾åºçææé¶ä»¶å·ç ï¼
SELECT DISTINCT PNO
FROM SPJ
INNER JOIN S
ON SPJ.`SNO`=S.`SNO`
WHERE CITY='ä¸æµ·';
# P5 P6
#ï¼6ï¼æ¾åºä½¿ç¨ä¸æµ·äº§çé¶ä»¶çå·¥ç¨å·ç ï¼
SELECT DISTINCT JNO
FROM SPJ
INNER JOIN S
ON SPJ.`SNO`=S.`SNO`
WHERE CITY='ä¸æµ·';
#J1 J3 J4
#ï¼7ï¼æ¾åºæ²¡æ使ç¨å¤©æ´¥äº§çé¶ä»¶çå·¥ç¨å·ç ï¼
SELECT DISTINCT JNO
FROM SPJ
WHERE JNO NOT IN(
SELECT DISTINCT JNO
FROM SPJ
INNER JOIN S
ON SPJ.`SNO`=S.`SNO`
WHERE CITY='天津'
);
#J4
#ï¼8ï¼æå
¨é¨çº¢è²é¶ä»¶çé¢è²æ¹æèè²ï¼
UPDATE P
SET COLOR='è'
WHERE COLOR='红'
#ï¼9ï¼ç±S5ä¾ç»J4çé¶ä»¶P6æ¹ä¸ºç±S3ä¾åºï¼
UPDATE SPJ
SET SNO='S3'
WHERE SNO='S5' AND PNO='P6';
#ï¼10ï¼ä»ä¾åºåå
³ç³»Sä¸å é¤S2çè®°å½ï¼å¹¶ä»ä¾åºæ
åµå
³ç³»SPJä¸å é¤ç¸åºçè®°å½ï¼
DELETE FROM SPJ
WHERE SNO='S2';
DELETE FROM S
WHERE SNO='S2';
#ï¼11ï¼è¯·å°ï¼S2,J6,P4,200ï¼æå
¥ä¾åºæ
åµå
³ç³»ã
# å
确认æ没æS2ååï¼æå¤é®çº¦æ
INSERT INTO SPJ(SNO,JNO,PNO,QTY) VALUES('S2', 'J6', 'P4',200);
æ¢å¤æ°æ®
#æ¢å¤åå
æ°æ®
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DROP TABLE spj;
DROP TABLE s;
DROP TABLE p;
DROP TABLE j;
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