课后作业

课后作业/5.sql

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+USE SPJ;
+
+-- ①
+SELECT SNO,CITY FROM S;
+
+-- ②
+SELECT PNAME,COLOR,WEIGHT FROM P;
+
+-- ③
+SELECT JNO FROM SPJ WHERE SNO='S1';
+
+-- ④
+SELECT P.PNAME,SPJ.QTY
+FROM SPJ
+JOIN J ON SPJ.JNO=J.JNO
+JOIN P ON SPJ.PNO=P.PNO
+WHERE J.JNO='J2';
+
+-- ⑤
+SELECT SPJ.PNO
+FROM SPJ
+JOIN S ON SPJ.SNO=S.SNO
+WHERE S.CITY='上海';
+
+-- ⑥
+SELECT J.JNAME
+FROM SPJ
+JOIN J ON SPJ.JNO=J.JNO
+JOIN S ON SPJ.SNO=S.SNO
+WHERE S.CITY='上海';
+
+-- ⑦
+SELECT SPJ.JNO
+FROM SPJ
+JOIN S ON SPJ.SNO=S.SNO
+WHERE S.CITY != '天津';
+
+-- ⑧
+UPDATE P
+SET COLOR='蓝'
+WHERE COLOR='红';
+
+-- ⑨
+UPDATE SPJ
+SET SNO='S3'
+WHERE SNO='S5' AND PNO='P6' AND JNO='J2';
+
+-- ⑩
+DELETE FROM SPJ
+WHERE SNO='S2';
+DELETE FROM S
+WHERE SNO='S2';
+
+-- ⑪
+INSERT INTO SPJ(SNO,JNO,PNO,QTY)
+VALUES('S2','J6','P4',200);