MySQL 的相關語句(增刪改查)(SQLyog軟體實現)

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MySQL 的相關語句(增刪改查)(SQLyog軟體實現)

MySQL 的相關語句(增刪改查)(SQLyog軟體實現)

-- 建立僱員表:emp
CREATE TABLE emp(
    empno        INT,        -- 員工編號
    ename        VARCHAR(50),    -- 員工姓名
    job        VARCHAR(50),    -- 員工工作
    mgr        INT,        -- 領導編號
    hiredate    DATE,        -- 入職日期
    sal        DECIMAL(7,2),    -- 月薪
    comm        DECIMAL(7,2),    -- 獎金
    deptno        INT        -- 部分編號
) ;

-- 添加資料
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);


-- 建立學生資訊表:stu
CREATE TABLE stu(
    sid    CHAR(6),    -- 學生學號
    sname    VARCHAR(50),    -- 學生姓名
    age    INT,        -- 學生年齡
    gender    VARCHAR(50)    -- 學生性別
);

-- 添加資料
INSERT INTO stu VALUES('S_1001', 'liuYi', 35, 'male');
INSERT INTO stu VALUES('S_1002', 'chenEr', 15, 'female');
INSERT INTO stu VALUES('S_1003', 'zhangSan', 95, 'male');
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', 'zhouBa', 45, 'female');
INSERT INTO stu VALUES('S_1009', 'wuJiu', 85, 'male');
INSERT INTO stu VALUES('S_1010', 'zhengShi', 50, 'female');
INSERT INTO stu VALUES('S_1011', 'xxx', NULL, NULL);

-- 建立部分表:dept
CREATE TABLE dept(
    deptno    INT,        -- 部分編碼
    dname    VARCHAR(14),    -- 部分名稱
    loc    VARCHAR(13)    -- 部分所在地點
);

-- 添加資料
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');


-- 查詢所有列
SELECT * FROM stu;

-- 查詢指定列
SELECT sname,age FROM stu;

-- 查詢性別為女,並且年齡為50的記錄
SELECT * FROM stu WHERE gender='female' AND age=50;

-- 查詢學號為S_1001,或者姓名為liSi的記錄
SELECT * FROM stu WHERE sid='s_1001' OR sname='lisi';

-- 查詢學號為S_1001,S_1002,S_1003的記錄
SELECT * FROM stu WHERE sid IN ('s_1001','s_1002','s_1003' );

-- 查詢學號不是S_1001,S_1002,S_1003的記錄
SELECT * FROM stu WHERE sid NOT IN ('s_1001','s_1002','s_1003' );

-- 查詢年齡為null的記錄
SELECT * FROM stu WHERE age IS NULL;

-- 查詢年齡在20到40之間的學生記錄
SELECT * FROM stu WHERE age BETWEEN 20 AND 40; -- 或者
SELECT * FROM stu WHERE age>=20 AND age<=40;

-- 查詢性別非男的學生記錄
SELECT * FROM stu WHERE gender !='male'; -- 或者
SELECT * FROM stu WHERE gender <>'male';

-- 查詢姓名不為null的學生記錄
SELECT * FROM stu WHERE sname IS NOT NULL; -- 或者
SELECT * FROM stu WHERE NOT sname IS NULL;

-- 查詢姓名由5個字母構成的學生記錄
SELECT * FROM stu WHERE sname LIKE '_____';

-- 查詢姓名由5個字母構成,並且第5個字母為“i”的學生記錄
SELECT * FROM stu WHERE sname LIKE '____i';

-- 查詢姓名以“z”開頭的學生記錄
SELECT * FROM stu WHERE sname LIKE 'z%';

-- 查詢姓名中第2個字母為“i”的學生記錄
SELECT * FROM stu WHERE sname LIKE '_i%';

-- 查詢姓名中包含“a”字母的學生記錄
SELECT * FROM stu WHERE sname LIKE '%a%';

-- 去除重複記錄
SELECT DISTINCT * FROM stu;


-- 查詢所有列
SELECT * FROM emp;

-- 查看僱員的月薪與傭金之和
SELECT *,sal+comm FROM emp; -- 或者
SELECT *,sal+IFNULL(comm,0) FROM emp;

-- 給列名添加別名
SELECT *, sal+IFNULL(comm,0) AS total FROM emp; -- 或者
SELECT *,sal+IFNULL(comm,0) total FROM emp;

-- 查詢所有學生記錄,按年齡升序排序
SELECT * FROM stu ORDER BY age;
SELECT * FROM stu ORDER BY age ASC;

-- 查詢所有學生記錄,按年齡降序排序
SELECT * FROM stu ORDER BY age DESC;

-- 查詢所有僱員,按月薪降序排序,如果月薪相同時,按編號升序排序
SELECT * FROM emp ORDER BY sal DESC,empno ASC;

-- 查詢emp表中記錄數
SELECT COUNT(*) AS cnt FROM emp;

-- 查詢emp表中有傭金的人數
SELECT COUNT(comm) AS cnt FROM emp;

-- 查詢emp表中月薪大於2500的人數
SELECT COUNT(*) AS cnt FROM emp WHERE sal > 2500;

-- 統計月薪與傭金之和大於2500元的人數
SELECT COUNT(*) AS cnt FROM emp WHERE sal+IFNULL(comm,0) > 2500;

-- 查詢有傭金的人數,以及有領導的人數
SELECT COUNT(comm), COUNT(mgr) FROM emp;

-- 查詢所有僱員月薪和
SELECT SUM(sal) FROM emp;

-- 查詢所有僱員月薪和,以及所有僱員傭金和
SELECT SUM(sal),SUM(comm) FROM emp;

-- 查詢所有僱員月薪+傭金和
SELECT SUM(sal+IFNULL(comm,0)) FROM emp;

-- 統計所有員工平均工資
SELECT AVG(sal) FROM emp;

-- 查詢最高工資和最低工資
SELECT MAX(sal),MIN(sal) FROM emp;

-- 查詢每個部門的部門編號和每個部門的工資和
SELECT deptno, SUM(sal) FROM emp GROUP BY deptno;

-- 查詢每個部門的部門編號以及每個部門的人數
SELECT deptno, COUNT(*) AS cnt FROM emp GROUP BY deptno;

-- 查詢每個部門的部門編號以及每個部門工資大於1500的人數
SELECT deptno, COUNT(*) FROM emp WHERE sal>1500 GROUP BY deptno;

-- 查詢工資總和大於9000的部門編號以及工資和
SELECT deptno, SUM(sal) FROM emp GROUP BY deptno HAVING SUM(sal) > 9000;

--

-- 查詢所有列
SELECT * FROM dept;

-- 建立學生資訊表 student
CREATE TABLE student(
    sid        INT,        -- 學號
    sname        VARCHAR(20),    -- 姓名
    age        INT,        -- 年齡
    scores        INT,        -- 成績
    gender        VARCHAR(6),    -- 性別
    birthday    DATE        -- 出生日期
);

-- 添加資料
INSERT INTO student(sid,sname,age,scores,gender) VALUES (0001,'張華',23,49,'女');
INSERT INTO student(sid,sname,age,scores,gender,birthday) VALUES (0007,'孫萌',20,59,'女','1997-02-24');
INSERT INTO student(sid,sname,age,scores,gender) VALUES (0002,'李四',28,69,'男');
INSERT INTO student(sid,sname,age,scores,gender,birthday) VALUES (0009,'吳笑清',22,68,'女','1994-11-02');
INSERT INTO student(sid,sname,age,scores,gender) VALUES (0003,'王小花',26,29,'女');
INSERT INTO student(sid,sname,age,scores,gender,birthday) VALUES (0004,'趙六',22,85,'男','1990-12-17');
INSERT INTO student(sid,sname,age,scores,gender,birthday) VALUES (0005,'錢雨',21,87,'女','1992-03-30');
INSERT INTO student(sid,sname,age,scores,gender,birthday) VALUES (0006,'李四',25,83,'男','1996-05-13');
INSERT INTO student(sid,sname,age,scores,gender,birthday) VALUES (0008,'周董',27,99,'男','1995-07-23');
INSERT INTO student(sid,sname,age,scores,gender,birthday) VALUES (00010,'鄭源',27,79,'男','1994-08-23');

-- 查詢所有列
SELECT * FROM student;

-- 刪除表 student
DROP TABLE student;

-- 去除重複記錄
SELECT DISTINCT * FROM student;

-- 顯示mydb下的所有表
USE mydb; SHOW TABLES;

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