这六个mysql的代码是怎么写的,这几个代码并没有答案不知道是什么
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- 小飞LOVE霞 2022-05-24 18:27关注
/* Navicat Premium Data Transfer Source Server : 127 Source Server Type : MySQL Source Server Version : 80028 Source Host : localhost:3306 Source Schema : test Target Server Type : MySQL Target Server Version : 80028 File Encoding : 65001 Date: 24/05/2022 18:24:48 */ SET NAMES utf8mb4; SET FOREIGN_KEY_CHECKS = 0; -- ---------------------------- -- Table structure for dept -- ---------------------------- DROP TABLE IF EXISTS `dept`; CREATE TABLE `dept` ( `deptID` char(3) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NOT NULL COMMENT '部门', `deptName` char(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NOT NULL COMMENT '部门名', `place` varchar(30) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL COMMENT '办公地点', `managerID` char(6) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL COMMENT '部门经理编号', PRIMARY KEY (`deptID`) USING BTREE ) ENGINE = InnoDB CHARACTER SET = utf8mb4 COLLATE = utf8mb4_0900_ai_ci ROW_FORMAT = Dynamic; -- ---------------------------- -- Records of dept -- ---------------------------- INSERT INTO `dept` VALUES ('1', '研发部', '北京', '1'); INSERT INTO `dept` VALUES ('2', '财务部', '北京', '1'); -- ---------------------------- -- Table structure for employee -- ---------------------------- DROP TABLE IF EXISTS `employee`; CREATE TABLE `employee` ( `empID` char(6) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NOT NULL COMMENT '职工号', `name` varchar(8) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NOT NULL COMMENT '姓名', `birth` date NOT NULL COMMENT '出生日期', `sex` char(2) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NOT NULL COMMENT '性别', `phone` char(11) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL COMMENT '电话号码', `hireDate` date NULL DEFAULT NULL COMMENT '入职日期', `PID` char(10) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL COMMENT '岗位号', `deptID` char(3) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL COMMENT '部门号', PRIMARY KEY (`empID`) USING BTREE ) ENGINE = InnoDB CHARACTER SET = utf8mb4 COLLATE = utf8mb4_0900_ai_ci ROW_FORMAT = Dynamic; -- ---------------------------- -- Records of employee -- ---------------------------- INSERT INTO `employee` VALUES ('1', '刘芳', '1994-01-01', '男', '18695332473', '2022-05-24', '1', '1'); INSERT INTO `employee` VALUES ('2', '张三', '2022-05-23', '女', '15095332473', '2022-05-23', '2', '2'); INSERT INTO `employee` VALUES ('3', '李四', '1994-01-01', '男', '18695332473', '2022-05-24', '1', '1'); -- ---------------------------- -- Table structure for post -- ---------------------------- DROP TABLE IF EXISTS `post`; CREATE TABLE `post` ( `PID` char(3) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NOT NULL COMMENT '岗位号', `Pname` varchar(10) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NOT NULL COMMENT '岗位名', `Pdesc` text CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL COMMENT '岗位描述', `Pallowance` decimal(7, 2) NULL DEFAULT 2000.00 COMMENT '岗位津贴', PRIMARY KEY (`PID`) USING BTREE ) ENGINE = InnoDB CHARACTER SET = utf8mb4 COLLATE = utf8mb4_0900_ai_ci ROW_FORMAT = Dynamic; -- ---------------------------- -- Records of post -- ---------------------------- INSERT INTO `post` VALUES ('1', '后端技术', '掉头发', 2000.00); INSERT INTO `post` VALUES ('2', '前端技术', '妹子少', 2000.00); -- ---------------------------- -- Table structure for salary -- ---------------------------- DROP TABLE IF EXISTS `salary`; CREATE TABLE `salary` ( `SID` int NOT NULL AUTO_INCREMENT COMMENT '薪水号', `empID` char(6) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NOT NULL COMMENT '职工号', `Bsalary` decimal(7, 2) NOT NULL COMMENT '基本工资', `Psalary` decimal(7, 2) NULL DEFAULT NULL COMMENT '岗位津贴', `Sdate` date NULL DEFAULT NULL COMMENT '日期', PRIMARY KEY (`SID`) USING BTREE ) ENGINE = InnoDB CHARACTER SET = utf8mb4 COLLATE = utf8mb4_0900_ai_ci ROW_FORMAT = Dynamic; -- ---------------------------- -- Records of salary -- ---------------------------- INSERT INTO `salary` VALUES (1, '1', 5000.00, 2500.00, '2022-05-24'); INSERT INTO `salary` VALUES (2, '2', 6000.00, 2500.00, '2022-05-24'); SET FOREIGN_KEY_CHECKS = 1;
# (1) 答案 SELECT b.empID, b.`name`, TIMESTAMPDIFF(YEAR,b.birth,CURDATE()) AS age FROM post a LEFT JOIN employee b ON a.PID = b.PID where a.Pname LIKE '%技术%' AND b.phone LIKE '186%'; # (2) 答案 SELECT b.deptName, c.Pname, COUNT(a.empID) AS count FROM employee a LEFT JOIN dept b ON a.deptID=b.deptID LEFT JOIN post c ON c.PID=a.PID; # (3) 答案 SELECT * FROM employee where PID IN (SELECT PID FROM employee where name='刘芳') AND deptID IN (SELECT deptID FROM employee where name='刘芳'); #(4)答案 SELECT a.empID, a.`name`, b.Bsalary FROM employee a LEFT JOIN salary b ON b.empID=a.empID where b.Bsalary > ( SELECT Bsalary FROM salary where empID=(SELECT empID FROM employee where NAME='刘芳')); # (5) SELECT * FROM post WHERE PID NOT IN (SELECT GROUP_CONCAT(PID) FROM employee); # (6) SELECT AVG(a.Bsalary) FROM salary a where empID IN (SELECT empID FROM employee WHERE deptID = (SELECT deptID FROM dept WHERE deptName='研发部'))
第五个可能不合适,你再看看
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