Add 实验六

实验六

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+use cs;
+
+#查询表
+desc bmxx;
+desc spxx;
+desc supplier;
+desc ygxx;
+
+#查看表内容
+select * from ygxx;
+select * from bmxx;
+select * from spxx;
+select * from spxx_bak;
+
+#删除表中某个属性
+ALTER TABLE bmxx DROP COLUMN bmaddr;
+
+#添加数据
+insert into ygxx(Ygbh,Name,Sex,Zw,Kl,QXjb,ssbmbh)values('10000001','张利','男','主管','123','5','1001');
+insert into ygxx(Ygbh,Name,Sex,Zw,Kl,QXjb,ssbmbh)values('10000002','刘程','男','副主管','123','4','1002');
+insert into ygxx values('10000003','张三','男','员工','12','1',null,'1003'),
+					   ('10000004','李四','男','员工','12','1',null,'1004');
+insert into bmxx values('1001','业务'),('1002','技术'),('1003','售后'),('1004','管理');
+insert into spxx values('10000001','空调','电器','1500','10'),('10000002','书包','文具','100','20'),
+					   ('10000003','卷纸','日用品','30','50'),('10000004','铅笔','文具','10','100'),
+                       ('10000005','橡皮','文具','5','1000'),('10000006','风扇','电器','1000','10'),
+                       ('10000007','水杯','日用品','20','100'),('10000008','牙刷','日用品','20','100');
+                       
+#修改数据
+update spxx set Jg='95',sl='15'
+				where Spmc='书包';
+update ygxx set Zw='主管'
+				where Name='刘程';
+                
+SET SQL_SAFE_UPDATES = 0;
+
+create table spxx_bak(
+Spbh char(8) not null primary key,
+Spmc varchar(20) not null,
+Sslb char(8) not null,
+Jg FLOAT(10,2) not null,
+sl int(4) not null);
+
+#复制表内容
+insert into spxx_bak select * from spxx  where  Sslb='文具';
+
+#删除表信息
+delete from spxx where Jg < 50;