當前位置：首頁 > 运维知识 > 数据库 >内容正文

数据库

mysql测试表格的年龄的语句是_MySQL查询语句练习题，测试基本够用了

發布時間：2023/12/19 数据库 22 豆豆

生活随笔收集整理的這篇文章主要介紹了 mysql测试表格的年龄的语句是_MySQL查询语句练习题，测试基本够用了小編覺得挺不錯的,現在分享給大家,幫大家做個參考.

Sutdent表的定義

字段名

字段描述

數據類型

主鍵

外鍵

非空

唯一

自增

學號

INT(10)

是

否

是

Name

姓名

VARCHAR(20)

否

是

否

Sex

性別

VARCHAR(4)

否

Birth

出生年份

YEAR

否

Department

院系

VARCHAR(20)

否

是

否

Address

家庭住址

VARCHAR(50)

否

Score表的定義

字段名

字段描述

數據類型

主鍵

外鍵

非空

唯一

自增

編號

INT(10)

是

否

是

Stu_id

學號

INT(10)

否

是

否

C_name

課程名

VARCHAR(20)

否

Grade

分數

INT(10)

否

1.創建student和score表

CREATE TABLEstudent (

idINT(10) NOT NULL UNIQUE PRIMARY KEY,

nameVARCHAR(20) NOT NULL,

sexVARCHAR(4) ,

birthYEAR,

departmentVARCHAR(20) ,

addressVARCHAR(50)

);

創建score表。SQL代碼如下：

CREATE TABLEscore (

idINT(10) NOT NULL UNIQUE PRIMARY KEYAUTO_INCREMENT ,

stu_idINT(10) NOT NULL,

c_nameVARCHAR(20) ,

gradeINT(10)

);

2.為student表和score表增加記錄

向student表插入記錄的INSERT語句如下：

INSERT INTO student VALUES( 901,'張老大', '男',1985,'計算機系', '北京市海淀區');INSERT INTO student VALUES( 902,'張老二', '男',1986,'中文系', '北京市昌平區');INSERT INTO student VALUES( 903,'張三', '女',1990,'中文系', '湖南省永州市');INSERT INTO student VALUES( 904,'李四', '男',1990,'英語系', '遼寧省阜新市');INSERT INTO student VALUES( 905,'王五', '女',1991,'英語系', '福建省廈門市');INSERT INTO student VALUES( 906,'王六', '男',1988,'計算機系', '湖南省衡陽市');

向score表插入記錄的INSERT語句如下：

INSERT INTO score VALUES(NULL,901, '計算機',98);INSERT INTO score VALUES(NULL,901, '英語', 80);INSERT INTO score VALUES(NULL,902, '計算機',65);INSERT INTO score VALUES(NULL,902, '中文',88);INSERT INTO score VALUES(NULL,903, '中文',95);INSERT INTO score VALUES(NULL,904, '計算機',70);INSERT INTO score VALUES(NULL,904, '英語',92);INSERT INTO score VALUES(NULL,905, '英語',94);INSERT INTO score VALUES(NULL,906, '計算機',90);INSERT INTO score VALUES(NULL,906, '英語',85);

3.查詢student表的所有記錄

mysql>?SELECT?*?FROM?student;

+-----+--------+------+-------+------------+--------------+

+-----+--------+------+-------+------------+--------------+

|?901?|?張老大?|?男???|??1985?|?計算機系???|?北京市海淀區?|

|?902?|?張老二?|?男???|??1986?|?中文系?????|?北京市昌平區?|

|?903?|?張三???|?女???|??1990?|?中文系?????|?湖南省永州市?|

|?904?|?李四???|?男???|??1990?|?英語系?????|?遼寧省阜新市?|

|?905?|?王五???|?女???|??1991?|?英語系?????|?福建省廈門市?|

|?906?|?王六???|?男???|??1988?|?計算機系???|?湖南省衡陽市?|

+-----+--------+------+-------+------------+--------------+

4.查詢student表的第2條到4條記錄

mysql>?SELECT?*?FROM?student?LIMIT?1,3;

+-----+--------+------+-------+------------+--------------+

+-----+--------+------+-------+------------+--------------+

|?902?|?張老二?|?男???|??1986?|?中文系?????|?北京市昌平區?|

|?903?|?張三???|?女???|??1990?|?中文系?????|?湖南省永州市?|

|?904?|?李四???|?男???|??1990?|?英語系?????|?遼寧省阜新市?|

+-----+--------+------+-------+------------+--------------+

5.從student表查詢所有學生的學號(id)、姓名(name)和院系(department)的信息

mysql>?SELECT?id,name,department?FROM?student;

+-----+--------+------------+

|?id??|?name???|?department?|

+-----+--------+------------+

|?901?|?張老大?|?計算機系???|

|?902?|?張老二?|?中文系?????|

|?903?|?張三???|?中文系?????|

|?904?|?李四???|?英語系?????|

|?905?|?王五???|?英語系?????|

|?906?|?王六???|?計算機系???|

+-----+--------+------------+

6.從student表中查詢計算機系和英語系的學生的信息

mysql>?SELECT?*?FROM?student?WHERE?department?IN?('計算機系','英語系');

+-----+--------+------+-------+------------+--------------+

+-----+--------+------+-------+------------+--------------+

|?901?|?張老大?|?男???|??1985?|?計算機系???|?北京市海淀區?|

|?904?|?李四???|?男???|??1990?|?英語系?????|?遼寧省阜新市?|

|?905?|?王五???|?女???|??1991?|?英語系?????|?福建省廈門市?|

|?906?|?王六???|?男???|??1988?|?計算機系???|?湖南省衡陽市?|

+-----+--------+------+-------+------------+--------------+

7.從student表中查詢年齡18~22歲的學生信息

mysql>?SELECT?id,name,sex,2013-birth?AS?age,department,address

->?FROM?student

->?WHERE?2013-birth?BETWEEN??18?AND?22;

+-----+------+------+------+------------+--------------+

|?id??|?name?|?sex??|?age??|?department?|?address??????|

+-----+------+------+------+------------+--------------+

|?905?|?王五?|?女???|???22?|?英語系?????|?福建省廈門市?|

+-----+------+------+------+------------+--------------+

mysql>?SELECT?id,name,sex,2013-birth?AS?age,department,address

->?FROM?student

->?WHERE?2013-birth>=18?AND?2013-birth<=22;

+-----+------+------+------+------------+--------------+

|?id??|?name?|?sex??|?age??|?department?|?address??????|

+-----+------+------+------+------------+--------------+

|?905?|?王五?|?女???|???22?|?英語系?????|?福建省廈門市?|

+-----+------+------+------+------------+--------------+

8.從student表中查詢每個院系有多少人

mysql>?SELECT?department,?COUNT(id)?FROM?student?GROUP?BY?department;

+------------+-----------+

|?department?|?COUNT(id)?|

+------------+-----------+

|?計算機系???|?????????2?|

|?英語系?????|?????????2?|

|?中文系?????|?????????2?|

+------------+-----------+

9.從score表中查詢每個科目的最高分

mysql>?SELECT?c_name,MAX(grade)?FROM?score?GROUP?BY?c_name;

+--------+------------+

|?c_name?|?MAX(grade)?|

+--------+------------+

|?計算機?|?????????98?|

|?英語???|?????????94?|

|?中文???|?????????95?|

+--------+------------+

10.查詢李四的考試科目(c_name)和考試成績(grade)

mysql>?SELECT?c_name,?grade

->??????FROM?score?WHERE?stu_id=

->??(SELECT?id?FROM?student

->????WHERE?name=?'李四'?);

+--------+-------+

|?c_name?|?grade?|

+--------+-------+

|?計算機?|????70?|

|?英語???|????92?|

+--------+-------+

11.用連接的方式查詢所有學生的信息和考試信息

mysql>?SELECT?student.id,name,sex,birth,department,address,c_name,grade

->?FROM?student,score

->??WHERE?student.id=score.stu_id;

+-----+--------+------+-------+------------+--------------+--------+-------+

+-----+--------+------+-------+------------+--------------+--------+-------+

|?901?|?張老大?|?男???|??1985?|?計算機系???|?北京市海淀區?|?計算機?|????98?|

|?901?|?張老大?|?男???|??1985?|?計算機系???|?北京市海淀區?|?英語???|????80?|

|?902?|?張老二?|?男???|??1986?|?中文系?????|?北京市昌平區?|?計算機?|????65?|

|?902?|?張老二?|?男???|??1986?|?中文系?????|?北京市昌平區?|?中文???|????88?|

|?903?|?張三???|?女???|??1990?|?中文系?????|?湖南省永州市?|?中文???|????95?|

|?904?|?李四???|?男???|??1990?|?英語系?????|?遼寧省阜新市?|?計算機?|????70?|

|?904?|?李四???|?男???|??1990?|?英語系?????|?遼寧省阜新市?|?英語???|????92?|

|?905?|?王五???|?女???|??1991?|?英語系?????|?福建省廈門市?|?英語???|????94?|

|?906?|?王六???|?男???|??1988?|?計算機系???|?湖南省衡陽市?|?計算機?|????90?|

|?906?|?王六???|?男???|??1988?|?計算機系???|?湖南省衡陽市?|?英語???|????85?|

+-----+--------+------+-------+------------+--------------+--------+-------+

12.計算每個學生的總成績

mysql>?SELECT?student.id,name,SUM(grade)?FROM?student,score

->?WHERE?student.id=score.stu_id

->?GROUP?BY?id;

+-----+--------+------------+

|?id??|?name???|?SUM(grade)?|

+-----+--------+------------+

|?901?|?張老大?|????????178?|

|?902?|?張老二?|????????153?|

|?903?|?張三???|?????????95?|

|?904?|?李四???|????????162?|

|?905?|?王五???|?????????94?|

|?906?|?王六???|????????175?|

+-----+--------+------------+

13.計算每個考試科目的平均成績

mysql>?SELECT?c_name,AVG(grade)?FROM?score?GROUP?BY?c_name;

+--------+------------+

|?c_name?|?AVG(grade)?|

+--------+------------+

|?計算機?|????80.7500?|

|?英語???|????87.7500?|

|?中文???|????91.5000?|

+--------+------------+

14.查詢計算機成績低于95的學生信息

mysql>?SELECT?*?FROM?student

->?WHERE?id?IN

->?(SELECT?stu_id?FROM?score

->?WHERE?c_name="計算機"?and?grade<95);

+-----+--------+------+-------+------------+--------------+

+-----+--------+------+-------+------------+--------------+

|?902?|?張老二?|?男???|??1986?|?中文系?????|?北京市昌平區?|

|?904?|?李四???|?男???|??1990?|?英語系?????|?遼寧省阜新市?|

|?906?|?王六???|?男???|??1988?|?計算機系???|?湖南省衡陽市?|

+-----+--------+------+-------+------------+--------------+

15.查詢同時參加計算機和英語考試的學生的信息

mysql>?SELECT?*??FROM?student

->??WHERE?id?=ANY

->??(?SELECT?stu_id?FROM?score

->??WHERE?stu_id?IN?(

->??????????SELECT?stu_id?FROM

->??????????score?WHERE?c_name=??'計算機')

->??AND?c_name=?'英語'?);

+-----+--------+------+-------+------------+--------------+

+-----+--------+------+-------+------------+--------------+

|?901?|?張老大?|?男???|??1985?|?計算機系???|?北京市海淀區?|

|?904?|?李四???|?男???|??1990?|?英語系?????|?遼寧省阜新市?|

|?906?|?王六???|?男???|??1988?|?計算機系???|?湖南省衡陽市?|

+-----+--------+------+-------+------------+--------------+

mysql>?SELECT?a.*?FROM?student?a?,score?b?,score?c

->?WHERE?a.id=b.stu_id

->?AND?b.c_name='計算機'

->?AND?a.id=c.stu_id

->?AND?c.c_name='英語';

+-----+--------+------+-------+------------+--------------+

+-----+--------+------+-------+------------+--------------+

|?901?|?張老大?|?男???|??1985?|?計算機系???|?北京市海淀區?|

|?904?|?李四???|?男???|??1990?|?英語系?????|?遼寧省阜新市?|

|?906?|?王六???|?男???|??1988?|?計算機系???|?湖南省衡陽市?|

+-----+--------+------+-------+------------+--------------+

16.將計算機考試成績按從高到低進行排序

mysql>?SELECT?stu_id,?grade

->??FROM?score?WHERE?c_name=?'計算機'

->??ORDER?BY?grade?DESC;

+--------+-------+

|?stu_id?|?grade?|

+--------+-------+

|????901?|????98?|

|????906?|????90?|

|????904?|????70?|

|????902?|????65?|

+--------+-------+

17.從student表和score表中查詢出學生的學號，然后合并查詢結果

mysql>?SELECT?id??FROM?student

->?UNION

->?SELECT?stu_id??FROM?score;

+-----+

|?id??|

+-----+

|?901?|

|?902?|

|?903?|

|?904?|

|?905?|

|?906?|

+-----+

18.查詢姓張或者姓王的同學的姓名、院系和考試科目及成績

mysql>?SELECT?student.id,?name,sex,birth,department,?address,?c_name,grade

->?FROM?student,?score

->?WHERE

->??(name?LIKE??'張%'??OR?name?LIKE??'王%')

->??AND

->??student.id=score.stu_id?;