更新时间:2024-06-29 GMT+08:00

cidr和inet操作符

操作符<<,<<=,>>,>>=对子网包含进行测试。它们只考虑两个地址的网络部分(忽略任何主机部分),然后判断其中一个网络是等于另外一个网络,还是另外一个网络的子网。

<

描述:小于

示例:

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SELECT inet '192.168.1.5' < inet '192.168.1.6' AS RESULT;
 result 
--------
 t
(1 row)

<=

描述:小于或等于

示例:

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SELECT inet '192.168.1.5' <= inet '192.168.1.5' AS RESULT;
 result 
--------
 t
(1 row)

=

描述:等于

示例:

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SELECT inet '192.168.1.5' = inet '192.168.1.5' AS RESULT;
 result 
--------
 t
(1 row)

>=

描述:大于或等于

示例:

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SELECT inet '192.168.1.5' >= inet '192.168.1.5' AS RESULT;
 result 
--------
 t
(1 row)

>

描述:大于

示例:

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SELECT inet '192.168.1.5' > inet '192.168.1.4' AS RESULT;
 result 
--------
 t
(1 row)

<>

描述:不等于

示例:

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SELECT inet '192.168.1.5' <> inet '192.168.1.4' AS RESULT;
 result 
--------
 t
(1 row)

<<

描述:包含于

示例:

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SELECT inet '192.168.1.5' << inet '192.168.1/24' AS RESULT;
 result 
--------
 t
(1 row)

<<=

描述:包含于或等于

示例:

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SELECT inet '192.168.1/24' <<= inet '192.168.1/24' AS RESULT;
 result 
--------
 t
(1 row)

>>

描述:包含

示例:

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SELECT inet '192.168.1/24' >> inet '192.168.1.5' AS RESULT;
 result 
--------
 t
(1 row)

>>=

描述:包含或等于

示例:

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SELECT inet '192.168.1/24' >>= inet '192.168.1/24' AS RESULT;
 result 
--------
 t
(1 row)

~

描述:位非

示例:

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SELECT ~ inet '192.168.1.6' AS RESULT; 
    result     
---------------
 63.87.254.249
(1 row)

&

描述:两个网络地址的每一位都进行“与”操作。

示例:

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SELECT inet '192.168.1.6' & inet '10.0.0.0' AS RESULT;
 result  
---------
 0.0.0.0
(1 row)

|

描述:两个网络地址的每一位都进行“或”操作。

示例:

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SELECT inet '192.168.1.6' | inet '10.0.0.0' AS RESULT;
   result    
-------------
 202.168.1.6
(1 row)

+

描述:加

示例:

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SELECT inet '192.168.1.6' + 25 AS RESULT;
    result    
--------------
 192.168.1.31
(1 row)

-

描述:减

示例:

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SELECT inet '192.168.1.43' - 36 AS RESULT;
   result    
-------------
 192.168.1.7
(1 row)
SELECT inet '192.168.1.43' - inet '192.168.1.19' AS RESULT;
 result 
--------
     24
(1 row)