118 lines
3.8 KiB
SQL
118 lines
3.8 KiB
SQL
/*
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Navicat Premium Data Transfer
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Source Server : lyx
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Source Server Type : MySQL
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Source Server Version : 50736
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Source Host : 111.229.181.183:3306
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Source Schema : test002
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Target Server Type : MySQL
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Target Server Version : 50736
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File Encoding : 65001
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Date: 19/07/2024 09:07:53
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*/
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SET NAMES utf8mb4;
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SET FOREIGN_KEY_CHECKS = 0;
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-- ----------------------------
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-- Table structure for stu_cou
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-- ----------------------------
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DROP TABLE IF EXISTS `stu_cou`;
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CREATE TABLE `stu_cou` (
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`sc_id` int(11) NOT NULL AUTO_INCREMENT,
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`c_id` int(11) NULL DEFAULT NULL,
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`s_id` int(11) NULL DEFAULT NULL,
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PRIMARY KEY (`sc_id`) USING BTREE
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) ENGINE = InnoDB AUTO_INCREMENT = 14 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci ROW_FORMAT = Dynamic;
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-- ----------------------------
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-- Records of stu_cou
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-- ----------------------------
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INSERT INTO `stu_cou` VALUES (1, 1, 1);
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INSERT INTO `stu_cou` VALUES (2, 1, 2);
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INSERT INTO `stu_cou` VALUES (3, 1, 5);
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INSERT INTO `stu_cou` VALUES (4, 2, 3);
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INSERT INTO `stu_cou` VALUES (5, 2, 4);
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INSERT INTO `stu_cou` VALUES (6, 2, 7);
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INSERT INTO `stu_cou` VALUES (7, 2, 9);
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INSERT INTO `stu_cou` VALUES (8, 3, 10);
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INSERT INTO `stu_cou` VALUES (9, 3, 6);
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INSERT INTO `stu_cou` VALUES (10, 3, 8);
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INSERT INTO `stu_cou` VALUES (11, 2, 8);
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INSERT INTO `stu_cou` VALUES (12, 1, 10);
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INSERT INTO `stu_cou` VALUES (13, 3, 2);
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-- ----------------------------
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-- Table structure for t_course
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-- ----------------------------
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DROP TABLE IF EXISTS `t_course`;
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CREATE TABLE `t_course` (
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`c_id` int(11) NOT NULL AUTO_INCREMENT,
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`c_name` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL,
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PRIMARY KEY (`c_id`) USING BTREE
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) ENGINE = InnoDB AUTO_INCREMENT = 7 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci ROW_FORMAT = Dynamic;
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-- ----------------------------
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-- Records of t_course
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-- ----------------------------
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INSERT INTO `t_course` VALUES (1, '英语');
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INSERT INTO `t_course` VALUES (2, '语文');
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INSERT INTO `t_course` VALUES (3, '数学');
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-- ----------------------------
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-- Table structure for t_student
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-- ----------------------------
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DROP TABLE IF EXISTS `t_student`;
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CREATE TABLE `t_student` (
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`s_id` int(11) NOT NULL AUTO_INCREMENT,
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`s_name` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL,
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`sex` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL,
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PRIMARY KEY (`s_id`) USING BTREE
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) ENGINE = InnoDB AUTO_INCREMENT = 21 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci ROW_FORMAT = Dynamic;
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-- ----------------------------
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-- Records of t_student
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-- ----------------------------
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INSERT INTO `t_student` VALUES (1, '张三', '男');
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INSERT INTO `t_student` VALUES (2, '李四', '女');
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INSERT INTO `t_student` VALUES (3, '王五', '男');
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INSERT INTO `t_student` VALUES (4, '赵六', '女');
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INSERT INTO `t_student` VALUES (5, '田七', '男');
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INSERT INTO `t_student` VALUES (6, '晓丽', '女');
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INSERT INTO `t_student` VALUES (7, '关谷', '男');
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INSERT INTO `t_student` VALUES (8, '架子', '男');
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INSERT INTO `t_student` VALUES (9, '淞沪', '女');
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INSERT INTO `t_student` VALUES (10, '威威', '女');
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SET FOREIGN_KEY_CHECKS = 1;
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-- 查询男生人数
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SELECT COUNT(*) AS count
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FROM t_student
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WHERE sex = '男';
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-- 查询女生人数
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SELECT COUNT(*) AS n_count
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FROM t_student
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WHERE sex = '女';
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-- 查询男生占比
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SELECT COUNT(*) * 100.0 / (SELECT COUNT(*) FROM t_student) AS people_nan
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FROM t_student
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WHERE sex = '男';
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-- 查询女生占比
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SELECT COUNT(*) * 100.0 / (SELECT COUNT(*) FROM t_student) AS people_nv
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FROM t_student
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WHERE sex = '女';
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-- 查询每门课程下的学生总人数
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SELECT c.c_name AS course_name, COUNT(sc.s_id) AS student_count
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FROM t_course c
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LEFT JOIN stu_cou sc ON c.c_id = sc.c_id
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GROUP BY c.c_name
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