SQL学习之使用常用函数处理数据

时间:2022-10-15 21:18:14

一、在介绍使用函数处理数据前,先说下使用DBMS(数据库管理系统)处理数据所带来的问题!

1、与几乎所有的DBMS都同等的支持SQL语句(如SELECT)不同,每一个DBMS都有特定的函数,事实上,只有少数几个函数被所有主要的DBMS等同的支持。

比如,像提取字符串的组成部分,ACESS使用MID();DB2、Oracle、Postgre和SQLite使用SUBSTR(),而MySQL和SQL SERVER使用SUBSTRING();

比如,数据类型的转换,Access和Oracle使用多个函数,每种类型的转换有一个函数;DB2和PostgreSQL使用Cast();MariaDB、MySQL和SQL Server使用CONVERT();

比如,获取当前日期,Access使用Now();DB2和PostgreSQL使用CURRENT_DATE;MariaDB和MySQL使用CURDATE();Oracle使用SYSDATE,SQL Server使用GETDATE(),SQLite使用DATE();

通过上面的例子我们可以看出,与SQL语句不一样,SQL函数是不可以移植的。这意味这特定SQL实现编写的代码在其他实现中可能不正常。

所以如果你在编写SQL程序的时候,需要考虑程序的可移植性,那么你在使用函数的时候一定要慎重,因为这些函数,在某些环境中可能没被实现,所以你在编写SQL代码的时候一定要写好注释,来说名这段代码是干嘛用的!以便于后续的开发或者库之间的移植!

2、下面是大多数SQL实现并支持一下的函数

(1)用于处理文本字符串(如删除或者填充,转换值为大写或者小写)的文本函数。

(2)用于在数值数据上进行算术操作(如返回绝对值,进行代数运算)的数值函数。

(3)用于处理日期和时间值并从这些值中提取特定成分(如返回两个日期之差,检查日期的有效性)的日期和时间函数。

(4)返回DBMS正使用的特殊信息(如返回用户登录信息)的系统函数

下面是常用的文本处理函数

1、LEFT()      ---返回字符串左边的字符

用法LEFT(计算字段,index),index表示向左查找开始的索引  如下代码:

select  cname,cno,tno from dbo.course where cno='c001'

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现在我需要cname列值中'S'左边的字符串,下面是解决代码:

select LEFT(cname,2),cno,tno from dbo.course where cno='c001'

aaarticlea/png;base64,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" alt="" />

ok,完成需求!

2、RIGHT()   ---返回字符串右边的字符

用法和LEFT()方法相反

3、LENGTH() (也可以使用DATALENGTH()或LEN())      ---返回字符串的长度    SQL Server中可以使用DATALENGTH和LEN()

用法:如下代码:

select DATALENGTH(cname),cno,tno from dbo.course where cno='c001'

4、 文本处理函数之UPPER()函数      ---将字符串转为大写

用法:UPPER(计算字段),将计算字段所在的列值全部转换成大写字母,看如下代码:

select top 5 cname,cno,tno from dbo.course

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现在有一个需求,需要将cname列值全部转换成大写,下面是解决代码:

select top 5 UPPER(cname),cno,tno from dbo.course

aaarticlea/png;base64,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" alt="" />

ok,需求完成!

6、文本处理函数之LOWER()函数      ---将字符串转换成小写

用法和UPPER()函数相反!

7、SOUNDEX()      ---返回字符串的SOUNDEX值

SOUNDEX是一个将任何文本字符串转换描述其语音表示的字母数字模式的算法。SOUNDEX考虑了类似的发音字符和音节,使得能对字符串进行发音比较而不是字母比较!虽然SOUNDEX不是SQL概念,但多数DBMS都提供对SOUNDEX的支持!代码如下:

select * from student where sname='Michael Green'

aaarticlea/png;base64,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" alt="" />

这个时候我们忘记sname的列值怎么拼了,只记得他的读音,这个时候使用SOUNDEX()函数就同样能检索出这条记录,代码如下:

select * from dbo.student where SOUNDEX(sname)=SOUNDEX('Michelle Green')

aaarticlea/png;base64,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" alt="" />

ok,完成检索!

8、日期和时间处理函数DATEPART()函数

在使用日期和时间处理函数编写程序前,需要注意一点,不同的DBMS都有自己特有的时间和日期格式,所以他们很不一致,可移植也非常差!

有如下代码:

select * from tb_order

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" alt="" />

现在有一个需求,需要检索2016年的所有订单数,下面是解决代码:

select * from tb_order where DATEPART(YY,orderdate)=2016

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" alt="" />

ok,需求完成!

9、下面是常用的数值处理函数

ABS()      ---返回一个数的绝对值

COS()      ---返回一个角度的余弦

EXP()      ---返回一个数的指数值

PI()      ---返回圆周率

SIN()      ---返回一个角度的正弦

SQRT()      ---返回一个数的平方根

TAN()      ---返回一个角度的正切