SQLyog软件
CREATE TABLE stu(创建表格 sid CHAR(6),字段 字段类型 sname VARCHAR(50), age INT, gender VARCHAR(50));INSERT INTO stu VALUES('s_1001','liuYi',35,'male');插入数据命令，对应的字段名INSERT INTO stu VALUES('s_1002','chenEr',15,'female');INSERT INTO stu VALUES('s_1003','zhangSan',95,'male');SELECT*FROM stu;INSERT INTO stu VALUES('s_1004','liSi',65,'female');INSERT INTO stu VALUES('s_1005','wangWu',55,'male');INSERT INTO stu VALUES ('s_1006','zhaoLiu',75,'female');INSERT INTO stu VALUES ('s_1007','sunQi',25,'male');INSERT INTO stu VALUES ('s_1008','zhaoBa',45,'female');INSERT INTO stu VALUES('s_1009','wuJiu',85,'male');INSERT INTO stu VALUES ('s_1010','zhengShi',5,'female');INSERT INTO stu VALUES('s_1011','xxx',NULL,NULL);
SELECT*FROM stu;显示stu 表格CREATE TABLE emp( empno INT, ename VARCHAR(50), job VARCHAR(50), mgr INT, hiredate DATE, sal DECIMAL(7,2), comm DECIMAL(7,2), deptno INT);
SHOW TABLES;INSERT INTO emp VALUES(7369,'SMITH','CLERK',7902,'1980-12-17',800,NULL,20);INSERT INTO emp VALUES(7499,'ALLEN','SALESMAN',7698,'1981-02-20',1600,300,30);INSERT INTO emp VALUES(7521,'WARD','SALESMAN',7698,'1981-02-22',1250,500,30);INSERT INTO emp VALUES(7566,'JONES','MANAGER',7839,'1981-04-02',2975,NULL,20);INSERT INTO emp VALUES(7654,'MARTIN','SALESMAN',7698,'1981-09-28',1250,1400,30);
INSERT INTO emp VALUES(7698,'BLAKE','MANAGER',7839,'1981-05-01',2850,NULL,30);INSERT INTO emp VALUES(7782,'CLARK','MANAGER',7839,'1981-06-09',2450,NULL,10);INSERT INTO emp VALUES(7788,'SCOTT','ANALYST',7566,'1987-04-19',3000,NULL,20);INSERT INTO emp VALUES(7839,'KING','PRESIDENT',NULL,'1981-11-17',5000,NULL,10);INSERT INTO emp VALUES(7844,'TURNER','SALESMAN',7698,'1981-09-08',1500,0,30);
INSERT INTO emp VALUES(7876,'ADAMS','CLERK',7788,'1987-05-23',1100,NULL,20);INSERT INTO emp VALUES(7900,'JAMES','CLERK',7698,'1981-12-03',950,NULL,30);INSERT INTO emp VALUES(7902,'FORD','ANALYST',7566,'1981-12-03',3000,NULL,20);INSERT INTO emp VALUES(7934,'MILLER','CLERK',7782,'1982-01-23',1300,NULL,10);CREATE TABLE dept( deptno INT, dname VARCHAR(14), loc VARCHAR(13));
INSERT INTO dept VALUES(10, 'ACCOUNTING', 'NEW YORK');INSERT INTO dept VALUES(20, 'RESEARCH', 'DALLAS');INSERT INTO dept VALUES(30, 'SALES', 'CHICAGO');INSERT INTO dept VALUES(40, 'OPERATIONS', 'BOSTON');SELECT*FROM stu;SELECT*FROM emp;SELECT*FROM dept;SELECT sname,age FROM stu;只显示出姓名和和年龄SELECT *FROM stu WHERE sid='s_1001' OR sname='liSi';显示字段sid为s_1001的或字段sname为李四的数据