操作符<<、<<=、>>、>>=对子网进行测试。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:
gbase=# 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:
gbase=# SELECT inet '192.168.1.5' <= inet '192.168.1.5' AS RESULT;
result
--------
t
(1 row)
描述:等于
示例:
gbase=# 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:
gbase=# SELECT inet '192.168.1.5' >= inet '192.168.1.5' AS RESULT;
result
--------
t
(1 row)
描述:大于
示例:
gbase=# SELECT inet '192.168.1.5' > inet '192.168.1.4' AS RESULT;
result
--------
t
(1 row)
描述:不等于
示例:
gbase=# SELECT inet '192.168.1.5' <> inet '192.168.1.4' AS RESULT;
result
--------
t
(1 row)
描述:包含于
示例:
gbase=# 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:
gbase=# SELECT inet '192.168.1/24' <<= inet '192.168.1/24' AS RESULT;
result
--------
t
(1 row)
描述:包含
示例:
gbase=# 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:
gbase=# SELECT inet '192.168.1/24' >>= inet '192.168.1/24' AS RESULT;
result
--------
t
(1 row)
描述:位非
示例:
gbase=# 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:
gbase=# 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:
gbase=# 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:
gbase=# SELECT inet '192.168.1.6' + 25 AS RESULT;
result
--------------
192.168.1.31
(1 row)
描述:减
示例:
gbase=# SELECT inet '192.168.1.43' - 36 AS RESULT;
result
-------------
192.168.1.7
(1 row)
描述:减
示例:
gbase=# SELECT inet '192.168.1.43' - inet '192.168.1.19' AS RESULT;
result
--------
24
(1 row)