2017-10-27周測試題

2017-10-27周測試題

系統初始以下腳本數據

• 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);

試題
1、創建student和score表語句

CREATE TABLE student(
    id              INT(10) PRIMARY KEY AUTO_INCREMENT,
    name            VARCHAR(20) NOT NULL,
    sex             VARCHAR(4),
    birth           YEAR,
    department      VARCHAR(20) NOT NULL,
    address         VARCHAR(50)
);
CREATE TABLE score(
    id        INT(10) PRIMARY KEY AUTO_INCREMENT,
    stu_id    INT(10) NOT NULL,
    c_name    VARCHAR(20),
    grade     INT(10)
);

2、查詢student表的所有記錄

SELECT * FROM student;

3、查詢student表的第2條到4條記錄

SELECT * FROM student LIMIT 1,3;

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

SELECT id AS '學號',name AS '姓名',department AS '院系' FROM student;

5、從student表中查詢計算機系和英語系的學生的信息（用 IN 關鍵字）

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

6、從student表中查詢年齡28~32歲的學生信息（用 BETWEEN AND）

SELECT * FROM student WHERE YEAR(NOW())-birth BETWEEN 28 AND 32;

7、從student表中查詢每個院系有多少人

SELECT department AS '院系',COUNT(*) AS '該院人數' FROM student GROUP BY department;

8、從score表中查詢每個科目的最高分

SELECT c_name AS '科目名稱',MAX(grade) AS '最高分' FROM score GROUP BY c_name;

9、查詢李四的考試科目（c_name）和考試成績（grade）

SELECT s.name AS '姓名',c.c_name AS '課程名稱',c.grade AS '課程分數' 
FROM score AS c LEFT JOIN student AS s ON c.stu_id = s.id
WHERE s.name = '李四';

10、用連接的方式查詢所有學生的信息和考試信息

SELECT * FROM score AS c LEFT JOIN student AS s ON c.stu_id = s.id;

11、計算每個學生的總成績

SELECT s.name AS '姓名',SUM(c.grade) AS '總成績' FROM score AS c
LEFT JOIN student AS s ON c.stu_id = s.id GROUP BY s.name;

12、計算每個考試科目的平均成績

SELECT c_name AS '課程名稱',AVG(grade) AS '平均成績' FROM score GROUP BY c_name;

13、查詢計算機成績低於95的學生信息

-- 第一種
SELECT s.* FROM score AS c LEFT JOIN student AS s ON c.stu_id = s.id
WHERE c.c_name = '計算機' AND c.grade < 95;

-- 第二種
SELECT * FROM student WHERE id IN (SELECT stu_id FROM score WHERE c_name = '計算機' AND grade < 95);

14、查詢同時參加計算機和英語考試的學生的信息

-- 第一種
SELECT * FROM student WHERE id IN 
(SELECT stu_id FROM score WHERE c_name = '計算機' OR c_name = '英語' GROUP BY stu_id HAVING COUNT(*) = 2);

-- 第二種
SELECT * FROM student WHERE id IN
(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');

-- 第三種
SELECT s.* FROM student AS s, score AS b ,score AS c WHERE s.id = b.stu_id AND b.c_name = '計算機' AND s.id = c.stu_id AND c.c_name = '英語';

15、將計算機考試成績按從高到低進行排序

SELECT grade AS '計算機考試成績' FROM score WHERE c_name = '計算機' ORDER BY grade DESC;

16、從student表和score表中查詢出學生的學號，然後合併查詢結果

SELECT id AS '學號' FROM student
UNION
SELECT DISTINCT stu_id AS '學號' FROM score;

17、查詢姓張或者姓王的同學的姓名、院系和考試科目及成績

SELECT s.name AS '姓名',s.department AS '院系',c.c_name AS '考試科目',c.grade AS '成績'
FROM score AS c LEFT JOIN student AS s ON c.stu_id = s.id
WHERE s.name LIKE '張%' OR s.name LIKE '王%';

18、查詢都是湖南的學生的姓名、年齡、院系和考試科目及成績

SELECT s.name AS '姓名',YEAR(NOW())-s.birth AS '年齡',s.department AS '院系',c.c_name AS '考試科目',c.grade AS '成績'
FROM score AS c LEFT JOIN student AS s ON c.stu_id = s.id
WHERE s.address LIKE '湖南%';