日考1

sql/test_6_1.sql

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+/*
+ Navicat Premium Data Transfer
+
+ Source Server         : 106.54.199.209
+ Source Server Type    : MySQL
+ Source Server Version : 80400
+ Source Host           : 106.54.199.209:3306
+ Source Schema         : test_6_1
+
+ Target Server Type    : MySQL
+ Target Server Version : 80400
+ File Encoding         : 65001
+
+ Date: 18/07/2024 20:52:42
+*/
+
+SET NAMES utf8mb4;
+SET FOREIGN_KEY_CHECKS = 0;
+
+-- ----------------------------
+-- Table structure for emp
+-- ----------------------------
+DROP TABLE IF EXISTS `emp`;
+CREATE TABLE `emp`  (
+  `e_id` int NOT NULL AUTO_INCREMENT,
+  `e_name` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL,
+  `sex` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL,
+  `tel` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL,
+  `class_id` int NULL DEFAULT NULL,
+  `age` int NULL DEFAULT NULL,
+  `sal` decimal(10, 2) NULL DEFAULT NULL,
+  PRIMARY KEY (`e_id`) USING BTREE
+) ENGINE = InnoDB CHARACTER SET = utf8mb4 COLLATE = utf8mb4_0900_ai_ci ROW_FORMAT = Dynamic;
+
+-- ----------------------------
+-- Records of emp
+-- ----------------------------
+INSERT INTO `emp` VALUES (1, '张依依', '男', '123456789', 10, 20, 1000.00);
+INSERT INTO `emp` VALUES (2, '刘晓红', '女', '123456781', 20, 20, 1556.00);
+INSERT INTO `emp` VALUES (3, '李四', '男', '123456782', 30, 23, 4567.00);
+INSERT INTO `emp` VALUES (4, '李强', '男', '123456783', 20, 20, 5600.00);
+INSERT INTO `emp` VALUES (5, '王艳', '女', '123456784', 20, 24, 6800.00);
+
+SET FOREIGN_KEY_CHECKS = 1;

sql/日考一.sql

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+
+
+
+
+-- 依据上图（字段类型一致），创建数据库，添加至少5条数据。
+
+CREATE TABLE `emp` (
+  `e_id` int NOT NULL AUTO_INCREMENT,
+  `e_name` varchar(255) DEFAULT NULL,
+  `sex` varchar(255) DEFAULT NULL,
+  `tel` varchar(255) DEFAULT NULL,
+  `class_id` int DEFAULT NULL,
+  `age` int DEFAULT NULL,
+  `sal` decimal(10,2) DEFAULT NULL,
+  PRIMARY KEY (`e_id`)
+)
+
+INSERT INTO `test_6_1`.`emp` (`e_name`, `sex`, `tel`, `class_id`, `age`, `sal`) VALUES ('张依依', '男', '123456789', 10, 20, 1000.00);
+INSERT INTO `test_6_1`.`emp` (`e_name`, `sex`, `tel`, `class_id`, `age`, `sal`) VALUES ('刘晓红', '女', '123456781', 20, 20, 1556.00);
+INSERT INTO `test_6_1`.`emp` (`e_name`, `sex`, `tel`, `class_id`, `age`, `sal`) VALUES ('李四', '男', '123456782', 30, 23, 4567.00);
+INSERT INTO `test_6_1`.`emp` (`e_name`, `sex`, `tel`, `class_id`, `age`, `sal`) VALUES ('李强', '男', '123456783', 20, 20, 5600.00);
+INSERT INTO `test_6_1`.`emp` (`e_name`, `sex`, `tel`, `class_id`, `age`, `sal`) VALUES ('王艳', '女', '123456784', 20, 24, 6800.00);
+
+-- 查询所有学生信息，并根据年龄进行降序排序
+
+SELECT * FROM emp ORDER BY emp.age DESC
+
+-- 显示姓王的学生的详细信息。
+
+SELECT * FROM emp WHERE emp.e_name LIKE CONCAT('%','王','%')
+
+-- 查询工资大于5000的所有男同学的信息
+
+SELECT * FROM emp WHERE emp.sal > 5000 AND emp.sex ='男'
+
+
+-- 查询班级编号为20的男同学的电话号码
+
+SELECT * FROM emp WHERE class_id = 20 AND emp.sex ='男'
+
+-- 查询最低工资。
+
+SELECT MIN(emp.sal) FROM  emp   
+
+-- 查询班级为30的学生的最小年龄
+
+SELECT MIN(emp.age) FROM emp WHERE emp.class_id = 30
+
+-- 查询女生的最低工资
+
+SELECT MIN(emp.sal) FROM emp WHERE emp.sex = '女'
+
+-- 查询女学生中薪资最低的人的全部信息
+
+SELECT * FROM emp WHERE emp.sal = (SELECT MIN(emp.sal) FROM emp WHERE emp.sex = '女')