134 lines
3.8 KiB
SQL
134 lines
3.8 KiB
SQL
/*
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Navicat Premium Data Transfer
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Source Server : 106.54.193.225
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Source Server Type : MySQL
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Source Server Version : 50736
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Source Host : 106.54.193.225:3306
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Source Schema : day02rk
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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 09:07:19
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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 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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`course_id` int(11) NOT NULL AUTO_INCREMENT,
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`course_name` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL,
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PRIMARY KEY (`course_id`) USING BTREE
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) ENGINE = InnoDB AUTO_INCREMENT = 4 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, '语文');
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INSERT INTO `t_course` VALUES (2, '数学');
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INSERT INTO `t_course` VALUES (3, '英语');
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-- ----------------------------
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-- Table structure for t_scope
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-- ----------------------------
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DROP TABLE IF EXISTS `t_scope`;
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CREATE TABLE `t_scope` (
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`scope_id` int(11) NOT NULL AUTO_INCREMENT,
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`course_id` int(11) NULL DEFAULT NULL,
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`student_id` int(11) NULL DEFAULT NULL,
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PRIMARY KEY (`scope_id`) USING BTREE
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) ENGINE = InnoDB AUTO_INCREMENT = 11 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci ROW_FORMAT = Dynamic;
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-- ----------------------------
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-- Records of t_scope
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-- ----------------------------
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INSERT INTO `t_scope` VALUES (1, 1, 1);
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INSERT INTO `t_scope` VALUES (2, 1, 2);
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INSERT INTO `t_scope` VALUES (3, 1, 3);
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INSERT INTO `t_scope` VALUES (4, 2, 3);
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INSERT INTO `t_scope` VALUES (5, 2, 4);
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INSERT INTO `t_scope` VALUES (6, 2, 5);
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INSERT INTO `t_scope` VALUES (7, 3, 6);
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INSERT INTO `t_scope` VALUES (8, 3, 7);
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INSERT INTO `t_scope` VALUES (9, 3, 8);
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INSERT INTO `t_scope` VALUES (10, 3, 9);
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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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`student_id` int(11) NOT NULL AUTO_INCREMENT,
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`student_name` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL,
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`student_sex` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL,
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PRIMARY KEY (`student_id`) USING BTREE
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) ENGINE = InnoDB AUTO_INCREMENT = 99 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, 'CVBS', '女');
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INSERT INTO `t_student` VALUES (3, '理论', '女');
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INSERT INTO `t_student` VALUES (4, '解决', '男');
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INSERT INTO `t_student` VALUES (5, '慢慢', '男');
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INSERT INTO `t_student` VALUES (6, '利旧', '女');
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INSERT INTO `t_student` VALUES (7, '赵六', '男');
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INSERT INTO `t_student` VALUES (8, '田七', '男');
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INSERT INTO `t_student` VALUES (9, '李四', '女');
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INSERT INTO `t_student` VALUES (10, '王五', '男');
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SET FOREIGN_KEY_CHECKS = 1;
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SELECT count(student_sex),student_sex count FROM t_student GROUP BY student_sex
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-- 3.查询男生和女生各多少人。（15分）
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SELECT count(student_sex) count,student_sex FROM t_student GROUP BY student_sex
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-- 4. 查询男生和女生分别占总人数的比例。（20分）
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SELECT count(student_id) count FROM t_student WHERE COUNT(student_sex) GROUP BY student_sex
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-- 5.查询每门课程下的学生总人数。（15分）
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SELECT
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count(*),c.course_name
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FROM
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t_scope s
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LEFT JOIN t_course c ON s.course_id = c.course_id
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LEFT JOIN t_student t ON t.student_id = s.student_id
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GROUP BY c.course_id
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