From fe46a70e44b0ad3b5601ae4e4fe291da62b3c55c Mon Sep 17 00:00:00 2001 From: xuxin <840198532@qq.com> Date: Sun, 11 Oct 2026 13:49:24 +0800 Subject: [PATCH] =?UTF-8?q?javaEEday07-DQL-Select-=E6=9D=A1=E4=BB=B6?= =?UTF-8?q?=E6=9F=A5=E8=AF=A2?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- mysql-day02.sql => mysql-day02-DML.sql | 0 mysql-day02-DQL.sql | 91 ++++++++++++++++++++++++++ 2 files changed, 91 insertions(+) rename mysql-day02.sql => mysql-day02-DML.sql (100%) create mode 100644 mysql-day02-DQL.sql diff --git a/mysql-day02.sql b/mysql-day02-DML.sql similarity index 100% rename from mysql-day02.sql rename to mysql-day02-DML.sql diff --git a/mysql-day02-DQL.sql b/mysql-day02-DQL.sql new file mode 100644 index 0000000..739b396 --- /dev/null +++ b/mysql-day02-DQL.sql @@ -0,0 +1,91 @@ +-- ===========================条件查询======================= +-- 数据准备 +-- 员工管理(带约束) +create table tb_emp ( + id int unsigned primary key auto_increment comment 'ID', + username varchar(20) not null unique comment '用户名', + password varchar(32) default '123456' comment '密码', + name varchar(10) not null comment '姓名', + gender tinyint unsigned not null comment '性别, 说明: 1 男, 2 女', + image varchar(300) comment '图像', + job tinyint unsigned comment '职位, 说明: 1 班主任,2 讲师, 3 学工主管, 4 教研主管', + entrydate date comment '入职时间', + create_time datetime not null comment '创建时间', + update_time datetime not null comment '修改时间' +) comment '员工表'; + +-- 准备测试数据 +INSERT INTO tb_emp (id, username, password, name, gender, image, job, entrydate, create_time, update_time) +VALUES + (1, 'jinyong', '123456', '金庸', 1, '1.jpg', 4, '2000-01-01', '2022-10-27 16:35:33', '2022-10-27 16:35:35'), + (2, 'zhangwuji', '123456', '张无忌', 1, '2.jpg', 2, '2015-01-01', '2022-10-27 16:35:33', '2022-10-27 16:35:37'), + (3, 'yangxiao', '123456', '杨逍', 1, '3.jpg', 2, '2008-05-01', '2022-10-27 16:35:33', '2022-10-27 16:35:39'), + (4, 'weiyixiao', '123456', '韦一笑', 1, '4.jpg', 2, '2007-01-01', '2022-10-27 16:35:33', '2022-10-27 16:35:41'), + (5, 'changyuchun', '123456', '常遇春', 1, '5.jpg', 2, '2012-12-05', '2022-10-27 16:35:33', '2022-10-27 16:35:43'), + (6, 'xiaozhao', '123456', '小昭', 2, '6.jpg', 3, '2013-09-05', '2022-10-27 16:35:33', '2022-10-27 16:35:45'), + (7, 'jixiaofu', '123456', '纪晓芙', 2, '7.jpg', 1, '2005-08-01', '2022-10-27 16:35:33', '2022-10-27 16:35:47'), + (8, 'zhouzhiruo', '123456', '周芷若', 2, '8.jpg', 1, '2014-11-09', '2022-10-27 16:35:33', '2022-10-27 16:35:49'), + (9, 'dingminjun', '123456', '丁敏君', 2, '9.jpg', 1, '2011-03-11', '2022-10-27 16:35:33', '2022-10-27 16:35:51'), + (10, 'zhaomin', '123456', '赵敏', 2, '10.jpg', 1, '2013-09-05', '2022-10-27 16:35:33', '2022-10-27 16:35:53'), + (11, 'luzhangke', '123456', '鹿杖客', 1, '11.jpg', 2, '2007-02-01', '2022-10-27 16:35:33', '2022-10-27 16:35:55'), + (12, 'hebiweng', '123456', '鹤笔翁', 1, '12.jpg', 2, '2008-08-18', '2022-10-27 16:35:33', '2022-10-27 16:35:57'), + (13, 'fangdongbai', '123456', '方东白', 1, '13.jpg', 1, '2012-11-01', '2022-10-27 16:35:33', '2022-10-27 16:35:59'), + (14, 'zhangsanfeng', '123456', '张三丰', 1, '14.jpg', 2, '2002-08-01', '2022-10-27 16:35:33', '2022-10-27 16:36:01'), + (15, 'yulianzhou', '123456', '俞莲舟', 1, '15.jpg', 2, '2011-05-01', '2022-10-27 16:35:33', '2022-10-27 16:36:03'), + (16, 'songyuanqiao', '123456', '宋远桥', 1, '16.jpg', 2, '2010-01-01', '2022-10-27 16:35:33', '2022-10-27 16:36:05'), + (17, 'chenyouliang', '12345678', '陈友谅', 1, '17.jpg', null, '2015-03-21', '2022-10-27 16:35:33', '2022-10-27 16:36:07'), + (18, 'zhang1', '123456', '张一', 1, '2.jpg', 2, '2015-01-01', '2022-10-27 16:35:33', '2022-10-27 16:36:09'), + (19, 'zhang2', '123456', '张二', 1, '2.jpg', 2, '2012-01-01', '2022-10-27 16:35:33', '2022-10-27 16:36:11'), + (20, 'zhang3', '123456', '张三', 1, '2.jpg', 2, '2018-01-01', '2022-10-27 16:35:33', '2022-10-27 16:36:13'), + (21, 'zhang4', '123456', '张四', 1, '2.jpg', 2, '2015-01-01', '2022-10-27 16:35:33', '2022-10-27 16:36:15'), + (22, 'zhang5', '123456', '张五', 1, '2.jpg', 2, '2016-01-01', '2022-10-27 16:35:33', '2022-10-27 16:36:17'), + (23, 'zhang6', '123456', '张六', 1, '2.jpg', 2, '2012-01-01', '2022-10-27 16:35:33', '2022-10-27 16:36:19'), + (24, 'zhang7', '123456', '张七', 1, '2.jpg', 2, '2006-01-01', '2022-10-27 16:35:33', '2022-10-27 16:36:21'), + (25, 'zhang8', '123456', '张八', 1, '2.jpg', 2, '2002-01-01', '2022-10-27 16:35:33', '2022-10-27 16:36:23'), + (26, 'zhang9', '123456', '张九', 1, '2.jpg', 2, '2011-01-01', '2022-10-27 16:35:33', '2022-10-27 16:36:25'), + (27, 'zhang10', '123456', '张十', 1, '2.jpg', 2, '2004-01-01', '2022-10-27 16:35:33', '2022-10-27 16:36:27'), + (28, 'zhang11', '123456', '张十一', 1, '2.jpg', 2, '2007-01-01', '2022-10-27 16:35:33', '2022-10-27 16:36:29'), + (29, 'zhang12', '123456', '张十二', 1, '2.jpg', 2, '2020-01-01', '2022-10-27 16:35:33', '2022-10-27 16:36:31'); + +-- 1. 查询 姓名 为 杨逍 的员工 +select * from tb_emp where name = '杨逍'; + +-- 2. 查询在 id小于等于5 的员工信息 +select * from tb_emp where id <= 5; + +-- 3. 查询 没有分配职位 的员工信息 -- 判断 null , 用 is null +select * from tb_emp where job is null; + +-- 4. 查询 有职位 的员工信息 -- 判断 不是null , 用 is not null +select * from tb_emp where job is not null; + +-- 5. 查询 密码不等于 '123456' 的员工信息 +select * from tb_emp where password != '123456'; +select * from tb_emp where password <> '123456'; + +-- 6. 查询入职日期 在 '2000-01-01' (包含) 到 '2010-01-01'(包含) 之间的员工信息 +select * from tb_emp where entrydate >= '2000-01-01' and entrydate <= '2010-01-01'; +select * from tb_emp where entrydate between '2000-01-01' and '2010-01-01'; + +-- 7. 查询 入职时间 在 '2000-01-01' (包含) 到 '2010-01-01'(包含) 之间 且 性别为女 的员工信息 +select * from tb_emp where entrydate between '2000-01-01' and '2010-01-01' and gender = 2; + +-- 8. 查询 职位是 2 (讲师), 3 (学工主管), 4 (教研主管) 的员工信息 +select * from tb_emp where job = 2 or job = 3 or job = 4; + +select * from tb_emp where job in (2,3,4); + +-- 9. 查询姓名为两个字的员工信息 【_匹配一个字符 %匹配0或多个字符】 +select * from tb_emp where name like '__'; + +-- 10. 查询姓 '张' 的员工信息 +select * from tb_emp where name like '张%'; + +-- 11. 查询姓名中包含 '三' 的员工信息 +select * from tb_emp where name like '%三%'; + +-- 练习 : 员工管理列表查询 +-- 条件 : name , gender , entrydate +select * from tb_emp where name like '%张%' + and gender = 1 + and entrydate between '2000-01-01' and '2010-01-01'