15.MySQL中的BETWEEN（在某个范围）

1.准备

CREATE DATABASE mahaiwuji;
USE mahaiwuji;

CREATE TABLE emp
(
    empno INT PRIMARY KEY,
    ename VARCHAR(10),
    sal INT
) ENGINE = INNODB DEFAULT CHARSET = utf8;

INSERT INTO emp VALUES (1,'smith',2800);
INSERT INTO emp VALUES (2,'allen',1500);
INSERT INTO emp VALUES (3,'ward',3500);
INSERT INTO emp VALUES (4,'jones',1300);
INSERT INTO emp VALUES (5,'martin',1600);
INSERT INTO emp VALUES (6,'blake',3000);

s15_1.png

2.BETWEEN…AND…

比较一个数据是否在指定的闭区间范围内

-- 查询sal在1500和3000之间的数据（包括1500和3000）
SELECT * FROM emp WHERE sal >= 1500 AND sal <= 3000;
-- 等价于
SELECT * FROM emp WHERE sal BETWEEN 1500 AND 3000;

s15_2.png

3.NOT BETWEEN…AND…

比较一个数据是否不在指定的闭区间范围内

-- 查询sal小于1500或者大于3000的数据（不包括1500和3000）
SELECT * FROM emp WHERE sal < 1500 OR sal > 3000;
-- 等价于
SELECT * FROM emp WHERE sal NOT BETWEEN 1500 AND 3000;

s15_3.png