[MySQL光速入门]012 做业解答

时间 2019-11-17

标签 mysql 光速入门解答栏目 MySQL 繁體版

原文原文链接

实训内容二

使用算数运算符-, 查询最低借阅量与最高借阅量的差值mysql
```
select max(borrowsum)-min(borrowsum) as 差值 from book;
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```
使用比较运算符(>)查询book表中借阅量大于10的书籍信息sql
```
select * from book where borrowsum > 10;
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```
使用right()函数返回从字符串loveMySQL右边开始的5个字符函数
```
select right('ILoveMySQL',5);
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```

查询数据表bookborrow中2011年的借阅信息post

-- 第1种方法
 SELECT
 	* 
 FROM
 	bookborrow 
 WHERE
     ( DATEDIFF( borrowtime, '2011-01-01' ) > 0 AND DATEDIFF( borrowtime, '2011-01-01' ) < 365 ) 
 	OR 
     ( DATEDIFF( returntime, '2011-01-01' ) > 0 AND DATEDIFF( returntime, '2011-01-01' ) < 365 );
     
 -- 第2种方法    
 SELECT
 	* 
 FROM
 	bookborrow 
 WHERE
     ( borrowtime >= '2011-01-01' AND borrowtime <= '2011-12-31' ) 
 	OR 
     ( returntime >= '2011-01-01' AND returntime <= '2011-12-31' );
 
 -- 第3种方法    
 SELECT
 	* 
 FROM
 	bookborrow 
 WHERE
     ( borrowtime BETWEEN '2011-01-01' AND '2011-12-31' ) 
 	OR 
     ( returntime BETWEEN '2011-01-01' AND '2011-12-31' );
 
 -- 第4种方法    
 SELECT
 	* 
 FROM
 	bookborrow 
 WHERE
     borrowtime LIKE '2011%' 
 	OR 
     returntime LIKE '2011%';
 
 -- 第5种方法    
 SELECT
 	* 
 FROM
 	bookborrow 
 WHERE
     borrowtime REGEXP '^2011' 
 	OR 
     returntime REGEXP '^2011';
 
 -- 第6种方法    
 SELECT
 	* 
 FROM
 	bookborrow 
 WHERE
     YEAR ( borrowtime ) = '2011' 
 	OR 
     YEAR ( returntime ) = '2011';
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使用concat()函数链接两个字符串spa

select concat('ILove','MySQL');
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操做题三

查询选修了C1或C2且分数大于或等于85分的学生学号code

SELECT
	student.sid 
FROM
	student,
	scourse 
WHERE
	student.sid = scourse.sid 
	AND scourse.cid IN ( 'C1', 'C2' ) 
	AND score >= 85;
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查询工资不在1500~2000之间的教师号,姓名,职称ci

SELECT
	tname,
	tid,
	title 
FROM
	teacher 
WHERE
	salary NOT BETWEEN 1500 
	AND 2000;
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从bookinfo中查询书的名称和单价, 使书的单价精确到个位便可字符串
```
select bname,TRUNCATE(bprice,1) from bookinfo;
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```
从bookinfo表中查询全部的书名, 数量以及单价信息, 并要求全部书名用大写字母表示get
```
SELECT
	upper( bname ),
	quantity,
	bprice 
FROM
	bookinfo;
复制代码
```

从bookinfo表中查询全部以processing结尾的书名, 数量, 单价信息it

SELECT
	bname,
	quantity,
	bprice 
FROM
	bookinfo 
WHERE
	bname LIKE '%processing';
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SELECT
	bname,
	quantity,
	bprice 
FROM
	bookinfo 
WHERE
	RIGHT ( bname, 10 ) = 'processing';
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SELECT
	bname,
	quantity,
	bprice 
FROM
	bookinfo 
WHERE
	bname REGEXP 'processing$' = 1;
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从bookinfo表中查询全部的书名, 单价信息以及将书名中的字符串processing替换为pro.后的结果

SELECT
	bname,
	REPLACE ( lower( bname ), 'processing', 'pro.' ) AS 转换后,
	bprice 
FROM
	bookinfo;
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[MySQL光速入门]012 做业解答

实训内容二

操做题三

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