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  • SQL测试题

    一.网上收集了一些测试题,对于掌握SQL查询语句。

      1 /*
      2  Navicat MySQL Data Transfer
      3 
      4  Source Server         : lizebo's MYSQL
      5  Source Server Type    : MySQL
      6  Source Server Version : 50720
      7  Source Host           : localhost:3306
      8  Source Schema         : sql练习
      9 
     10  Target Server Type    : MySQL
     11  Target Server Version : 50720
     12  File Encoding         : 65001
     13 
     14  Date: 07/11/2017 20:09:05
     15 */
     16 
     17 SET NAMES utf8mb4;
     18 SET FOREIGN_KEY_CHECKS = 0;
     19 
     20 -- ----------------------------
     21 -- Table structure for class
     22 -- ----------------------------
     23 DROP TABLE IF EXISTS `class`;
     24 CREATE TABLE `class`  (
     25   `cid` int(11) NOT NULL AUTO_INCREMENT,
     26   `caption` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
     27   PRIMARY KEY (`cid`) USING BTREE
     28 ) ENGINE = InnoDB AUTO_INCREMENT = 5 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;
     29 
     30 -- ----------------------------
     31 -- Records of class
     32 -- ----------------------------
     33 INSERT INTO `class` VALUES (1, '三年二班');
     34 INSERT INTO `class` VALUES (2, '三年三班');
     35 INSERT INTO `class` VALUES (3, '一年二班');
     36 INSERT INTO `class` VALUES (4, '二年九班');
     37 
     38 -- ----------------------------
     39 -- Table structure for course
     40 -- ----------------------------
     41 DROP TABLE IF EXISTS `course`;
     42 CREATE TABLE `course`  (
     43   `cid` int(11) NOT NULL AUTO_INCREMENT,
     44   `cname` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
     45   `teacher_id` int(11) NOT NULL,
     46   PRIMARY KEY (`cid`) USING BTREE,
     47   INDEX `fk_course_teacher`(`teacher_id`) USING BTREE,
     48   CONSTRAINT `fk_course_teacher` FOREIGN KEY (`teacher_id`) REFERENCES `teacher` (`tid`) ON DELETE RESTRICT ON UPDATE RESTRICT
     49 ) ENGINE = InnoDB AUTO_INCREMENT = 5 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;
     50 
     51 -- ----------------------------
     52 -- Records of course
     53 -- ----------------------------
     54 INSERT INTO `course` VALUES (1, '生物', 1);
     55 INSERT INTO `course` VALUES (2, '物理', 2);
     56 INSERT INTO `course` VALUES (3, '体育', 3);
     57 INSERT INTO `course` VALUES (4, '美术', 2);
     58 
     59 -- ----------------------------
     60 -- Table structure for score
     61 -- ----------------------------
     62 DROP TABLE IF EXISTS `score`;
     63 CREATE TABLE `score`  (
     64   `sid` int(11) NOT NULL AUTO_INCREMENT,
     65   `student_id` int(11) NOT NULL,
     66   `course_id` int(11) NOT NULL,
     67   `num` int(11) NOT NULL,
     68   PRIMARY KEY (`sid`) USING BTREE,
     69   INDEX `fk_score_student`(`student_id`) USING BTREE,
     70   INDEX `fk_score_course`(`course_id`) USING BTREE,
     71   CONSTRAINT `fk_score_course` FOREIGN KEY (`course_id`) REFERENCES `course` (`cid`) ON DELETE RESTRICT ON UPDATE RESTRICT,
     72   CONSTRAINT `fk_score_student` FOREIGN KEY (`student_id`) REFERENCES `student` (`sid`) ON DELETE RESTRICT ON UPDATE RESTRICT
     73 ) ENGINE = InnoDB AUTO_INCREMENT = 53 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;
     74 
     75 -- ----------------------------
     76 -- Records of score
     77 -- ----------------------------
     78 INSERT INTO `score` VALUES (1, 1, 1, 10);
     79 INSERT INTO `score` VALUES (2, 1, 2, 9);
     80 INSERT INTO `score` VALUES (5, 1, 4, 66);
     81 INSERT INTO `score` VALUES (6, 2, 1, 8);
     82 INSERT INTO `score` VALUES (8, 2, 3, 68);
     83 INSERT INTO `score` VALUES (9, 2, 4, 99);
     84 INSERT INTO `score` VALUES (10, 3, 1, 77);
     85 INSERT INTO `score` VALUES (11, 3, 2, 66);
     86 INSERT INTO `score` VALUES (12, 3, 3, 87);
     87 INSERT INTO `score` VALUES (13, 3, 4, 99);
     88 INSERT INTO `score` VALUES (14, 4, 1, 79);
     89 INSERT INTO `score` VALUES (15, 4, 2, 11);
     90 INSERT INTO `score` VALUES (16, 4, 3, 67);
     91 INSERT INTO `score` VALUES (17, 4, 4, 100);
     92 INSERT INTO `score` VALUES (18, 5, 1, 79);
     93 INSERT INTO `score` VALUES (19, 5, 2, 11);
     94 INSERT INTO `score` VALUES (20, 5, 3, 67);
     95 INSERT INTO `score` VALUES (21, 5, 4, 100);
     96 INSERT INTO `score` VALUES (22, 6, 1, 9);
     97 INSERT INTO `score` VALUES (23, 6, 2, 100);
     98 INSERT INTO `score` VALUES (24, 6, 3, 67);
     99 INSERT INTO `score` VALUES (25, 6, 4, 100);
    100 INSERT INTO `score` VALUES (26, 7, 1, 9);
    101 INSERT INTO `score` VALUES (27, 7, 2, 100);
    102 INSERT INTO `score` VALUES (28, 7, 3, 67);
    103 INSERT INTO `score` VALUES (29, 7, 4, 88);
    104 INSERT INTO `score` VALUES (30, 8, 1, 9);
    105 INSERT INTO `score` VALUES (31, 8, 2, 100);
    106 INSERT INTO `score` VALUES (32, 8, 3, 67);
    107 INSERT INTO `score` VALUES (33, 8, 4, 88);
    108 INSERT INTO `score` VALUES (34, 9, 1, 91);
    109 INSERT INTO `score` VALUES (35, 9, 2, 88);
    110 INSERT INTO `score` VALUES (36, 9, 3, 67);
    111 INSERT INTO `score` VALUES (37, 9, 4, 22);
    112 INSERT INTO `score` VALUES (38, 10, 1, 90);
    113 INSERT INTO `score` VALUES (39, 10, 2, 77);
    114 INSERT INTO `score` VALUES (40, 10, 3, 43);
    115 INSERT INTO `score` VALUES (41, 10, 4, 87);
    116 INSERT INTO `score` VALUES (42, 11, 1, 90);
    117 INSERT INTO `score` VALUES (43, 11, 2, 77);
    118 INSERT INTO `score` VALUES (44, 11, 3, 43);
    119 INSERT INTO `score` VALUES (45, 11, 4, 87);
    120 INSERT INTO `score` VALUES (46, 12, 1, 90);
    121 INSERT INTO `score` VALUES (47, 12, 2, 77);
    122 INSERT INTO `score` VALUES (48, 12, 3, 43);
    123 INSERT INTO `score` VALUES (49, 12, 4, 87);
    124 INSERT INTO `score` VALUES (52, 13, 3, 87);
    125 
    126 -- ----------------------------
    127 -- Table structure for student
    128 -- ----------------------------
    129 DROP TABLE IF EXISTS `student`;
    130 CREATE TABLE `student`  (
    131   `sid` int(11) NOT NULL AUTO_INCREMENT,
    132   `gender` char(1) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
    133   `class_id` int(11) NOT NULL,
    134   `sname` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
    135   PRIMARY KEY (`sid`) USING BTREE,
    136   INDEX `fk_class`(`class_id`) USING BTREE,
    137   CONSTRAINT `fk_class` FOREIGN KEY (`class_id`) REFERENCES `class` (`cid`) ON DELETE RESTRICT ON UPDATE RESTRICT
    138 ) ENGINE = InnoDB AUTO_INCREMENT = 17 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;
    139 
    140 -- ----------------------------
    141 -- Records of student
    142 -- ----------------------------
    143 INSERT INTO `student` VALUES (1, '', 1, '理解');
    144 INSERT INTO `student` VALUES (2, '', 1, '钢蛋');
    145 INSERT INTO `student` VALUES (3, '', 1, '张三');
    146 INSERT INTO `student` VALUES (4, '', 1, '张一');
    147 INSERT INTO `student` VALUES (5, '', 1, '张二');
    148 INSERT INTO `student` VALUES (6, '', 1, '张四');
    149 INSERT INTO `student` VALUES (7, '', 2, '铁锤');
    150 INSERT INTO `student` VALUES (8, '', 2, '李三');
    151 INSERT INTO `student` VALUES (9, '', 2, '李一');
    152 INSERT INTO `student` VALUES (10, '', 2, '李二');
    153 INSERT INTO `student` VALUES (11, '', 2, '李四');
    154 INSERT INTO `student` VALUES (12, '', 3, '如花');
    155 INSERT INTO `student` VALUES (13, '', 3, '刘三');
    156 INSERT INTO `student` VALUES (14, '', 3, '刘一');
    157 INSERT INTO `student` VALUES (15, '', 3, '刘二');
    158 INSERT INTO `student` VALUES (16, '', 3, '刘四');
    159 
    160 -- ----------------------------
    161 -- Table structure for teacher
    162 -- ----------------------------
    163 DROP TABLE IF EXISTS `teacher`;
    164 CREATE TABLE `teacher`  (
    165   `tid` int(11) NOT NULL AUTO_INCREMENT,
    166   `tname` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
    167   PRIMARY KEY (`tid`) USING BTREE
    168 ) ENGINE = InnoDB AUTO_INCREMENT = 6 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;
    169 
    170 -- ----------------------------
    171 -- Records of teacher
    172 -- ----------------------------
    173 INSERT INTO `teacher` VALUES (1, '张磊老师');
    174 INSERT INTO `teacher` VALUES (2, '李平老师');
    175 INSERT INTO `teacher` VALUES (3, '刘海燕老师');
    176 INSERT INTO `teacher` VALUES (4, '朱云海老师');
    177 INSERT INTO `teacher` VALUES (5, '李杰老师');
    178 
    179 SET FOREIGN_KEY_CHECKS = 1;
    View Code

     二.查询题

    1.查询平均成绩大于60分的同学的学号和平均成绩。(由于一个同学可能选择了多个课程,我们要先查询大于60分的同学就必须分组;得到大于60分的同学;最后查询他们的学号和平均成绩)

    2.查询学生的平均分,姓名,student_id;

    3.根据上面的查询结果我们可以进行子查询出student_id和avg(num)

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  • 原文地址:https://www.cnblogs.com/lizeboLB/p/7801175.html
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