T-SQL-LIKE子句 


T-SQL-像条款


MS SQL Server LIKE子句用于使用通配符运算符将值与相似值进行比较。有两个通配符与LIKE运算符一起使用-

  • 百分号(%)
  • 下划线(_)

百分号代表零个,一个或多个字符。下划线表示单个数字或字符。这些符号可以组合使用。

句法

以下是%和_的基本语法。

SELECT *\column-list FROM table_name 
WHERE column LIKE 'XXXX%' 
 
or   

SELECT *\column-list FROM table_name 
WHERE column LIKE '%XXXX%'  

or  

SELECT *\column-list FROM table_name 
WHERE column LIKE 'XXXX_'  

or  

SELECT *\column-list FROM table_name 
WHERE column LIKE '_XXXX'  

or  

SELECT  *\column-list FROM table_name 
WHERE column LIKE '_XXXX_' 

您可以使用AND或OR运算符组合N个条件。 XXXX可以是任何数字或字符串值。

以下是一些示例,这些示例显示WHERE部分具有不同的LIKE子句,并且带有’%’和’_’运算符。

Sr.No Statement & Description
1

WHERE SALARY LIKE ‘200%’

Finds any values that start with 200

2

WHERE SALARY LIKE ‘%200%’

Finds any values that have 200 in any position

3

WHERE SALARY LIKE ‘_00%’

Finds any values that have 00 in the second and third positions

4

WHERE SALARY LIKE ‘2_%_%’

Finds any values that start with 2 and are at least 3 characters in length

5

WHERE SALARY LIKE ‘%2’

Finds any values that end with 2

6

WHERE SALARY LIKE ‘_2%3’

Finds any values that have a 2 in the second position and end with a 3

7

WHERE SALARY LIKE ‘2___3’

Finds any values in a five-digit number that start with 2 and end with 3

考虑具有以下记录的CUSTOMERS表。

ID  NAME       AGE       ADDRESS            SALARY 
1   Ramesh     32        Ahmedabad          2000.00 
2   Khilan     25        Delhi              1500.00 
3   kaushik    23        Kota               2000.00 
4   Chaitali   25        Mumbai             6500.00 
5   Hardik     27        Bhopal             8500.00 
6   Komal      22        MP                 4500.00 
7   Muffy      24        Indore             10000.00 

以下命令是一个示例,它将显示来自CUSTOMERS表的所有记录,其中SALARY以200开头。

SELECT * FROM CUSTOMERS 
WHERE SALARY LIKE '200%'; 

上面的命令将产生以下输出。

ID   NAME     AGE     ADDRESS       SALARY 
1    Ramesh   32      Ahmedabad     2000.00 
3    kaushik  23      Kota          2000.00
0



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