MySQL Practice Questions 10.2

1. Create a table EMPLOY, the fields in the table are as shown in the figure below:

 create table EMPLOY
     (
     EMPNO INT PRIMARY KEY,
     ENAME VARCHAR(10),
     JOB VARCHAR(9),
     MGB INT,
     HIREDATE DATE,
     SAL DOUBLE,
     COMM DOUBLE,
     DEPTNO INT
     );

2. Insert the following data into the table:

INSERT INTO EMPLOY VALUES
(7369,'SMITH','职员',7566,"1980-12-17",800,NULL,20),
     (7499,'ALLEN','销售员',7698,"1981-02-20",1600,300,30),
     (7521,'WARD','销售员',7698,"1981-02-22",1250,500,30),
     (7566,'JONES','经理',7839,"1981-04-02",2975,NULL,20),
     (7654,'MARTIN','销售员',7698,"1981-09-28",1250,1400,30),
     (7698,'BLANK','经理',7839,"1981-05-01",2850,NULL,30),
     (7782,'CLARK','经理',7839,"1981-06-09",2450,NULL,10),
     (7788,'SCOTT','职员',7566,"1987-07-03",3000,2000,20),
     (7839,'KING','董事长',NULL,"1981-11-17",5000,NULL,10);

3. Complete the following query:
(1) Find the detailed information of the employee whose department is 30.

select * from EMPLOY WHERE DEPTNO=30;

(2) Find out the number, name, and department number of the employee engaged in the work of the employee.

 select EMPNO,ENAME,DEPTNO from EMPLOY WHERE JOB IN('职员');

(3) Retrieve information about employees whose bonuses are more than their basic salary.

select * from EMPLOY where COMM>SAL;

(4) Retrieve information about employees whose bonuses are more than 60% of their basic salary.

select * from EMPLOY where COMM>SAL*0.6;

(5) Find out the information of the employee whose name contains A.

select * from EMPLOY where ENAME LIKE '%A%';

(6) Find out the information of employees whose names start with A, B, and S.

select * from EMPLOY where ENAME LIKE 'A%' OR ENAME LIKE 'B%' OR ENAME LIKE 'S%';

(7) Find employee information whose name is 7 characters long.

select * from EMPLOY where ENAME LIKE '_______';

(8) Query employees who have no bonus or bonuses less than 1000.

select * from EMPLOY where COMM IS NULL OR COMM<1000;

(9) Query employees who joined in 2000

select * from EMPLOY where HIREDATE>='2000-1-1' AND HIREDATE<='2000-12-31';

MySQL Practice Questions 10.2

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