SQL练习题共50道附答案（MySQL）

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最新推荐文章于 2025-04-08 14:50:36 发布

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分类专栏：数据库文章标签： mysql 数据库

本文链接：https://blog.csdn.net/Code__rookie/article/details/108327478

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本文提供50道SQL练习题，涉及MySQL数据库操作，包含查询特定条件成绩、平均分、学生选课情况、教师授课信息等多种场景，旨在提升SQL查询能力。

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SQL练习题共50道附答案（MySQL）

数据库表名称和字段

1.学生表 
student(s_id,s_name,s_birth,s_sex) 
-- 学生编号,学生姓名, 出生年月,学生性别 

2.课程表 
course(c_id,c_name,t_id) 
-- 课程编号, 课程名称, 教师编号 

3.教师表 
teacher(t_id,t_name) 
-– 教师编号,教师姓名 

4.成绩表 
score(s_id,c_id,s_score) 
--学生编号,课程编号,分数

建立一个数据库,导入数据到数据库:

 
 --  建立课程表
DROP TABLE IF EXISTS `course`;
CREATE TABLE `course`  (
   `c_id` varchar(20) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL DEFAULT '' COMMENT '课程编号',
   `c_name` varchar(20) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL DEFAULT '' COMMENT '课程名称',
   `t_id` varchar(20) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL COMMENT '教师编号',
   PRIMARY KEY (`c_id`) USING BTREE
 ) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Compact;
 
-- 课程表数据
INSERT INTO `course` VALUES ('01', '语文', '02');
INSERT INTO `course` VALUES ('02', '数学', '01');
INSERT INTO `course` VALUES ('03', '英语', '03');


-- 分数表
DROP TABLE IF EXISTS `score`;
CREATE TABLE `score`  (
  `s_id` varchar(20) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL DEFAULT '' COMMENT '学生编号',
  `c_id` varchar(20) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL DEFAULT '' COMMENT '课程编号',
  `s_score` int(3) NULL DEFAULT NULL COMMENT '分数',
  PRIMARY KEY (`s_id`, `c_id`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Compact;


-- 分数数据
INSERT INTO `score` VALUES ('01', '01', 80);
INSERT INTO `score` VALUES ('01', '02', 90);
INSERT INTO `score` VALUES ('01', '03', 99);
INSERT INTO `score` VALUES ('02', '01', 70);
INSERT INTO `score` VALUES ('02', '02', 60);
INSERT INTO `score` VALUES ('02', '03', 80);
INSERT INTO `score` VALUES ('03', '01', 80);
INSERT INTO `score` VALUES ('03', '02', 80);
INSERT INTO `score` VALUES ('03', '03', 80);
INSERT INTO `score` VALUES ('04', '01', 50);
INSERT INTO `score` VALUES ('04', '02', 30);
INSERT INTO `score` VALUES ('04', '03', 20);
INSERT INTO `score` VALUES ('05', '01', 76);
INSERT INTO `score` VALUES ('05', '02', 87);
INSERT INTO `score` VALUES ('05', '03', 95);
INSERT INTO `score` VALUES ('06', '01', 31);
INSERT INTO `score` VALUES ('06', '02', 88);
INSERT INTO `score` VALUES ('06', '03', 34);
INSERT INTO `score` VALUES ('07', '01', 66);
INSERT INTO `score` VALUES ('07', '02', 89);
INSERT INTO `score` VALUES ('07', '03', 98);
INSERT INTO `score` VALUES ('08', '01', 59);
INSERT INTO `score` VALUES ('08', '02', 88);
INSERT INTO `score` VALUES ('09', '02', 67);
INSERT INTO `score` VALUES ('09', '03', 88);
INSERT INTO `score` VALUES ('10', '01', 65);
INSERT INTO `score` VALUES ('10', '02', 78);


-- 建立学生表
DROP TABLE IF EXISTS `student`;
CREATE TABLE `student`  (
  `s_id` varchar(20) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL DEFAULT '' COMMENT '学生编号',
  `s_name` varchar(20) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL DEFAULT '' COMMENT '学生姓名',
  `s_birth` varchar(20) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL DEFAULT '' COMMENT '出生年月',
  `s_sex` varchar(10) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL DEFAULT '' COMMENT '学生性别',
  PRIMARY KEY (`s_id`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Compact;


-- 学生数据
INSERT INTO `student` VALUES ('01', '斯内克', '1990-01-01', '男');
INSERT INTO `student` VALUES ('02', '张益达', '1990-12-21', '男');
INSERT INTO `student` VALUES ('03', '张大炮', '1990-05-20', '男');
INSERT INTO `student`</