Postgresql - Functions and Operators 函数和运算 - Range

区间范围的函数和运算。

Operator	Description	Example	Result
=	equal 等于	int4range(1,5) = '[1,4]'::int4range	t
<>	not equal 不等于	numrange(1.1,2.2) <> numrange(1.1,2.3)	t
<	less than 小于	int4range(1,10) < int4range(2,3)	t
>	greater than 大于	int4range(1,10) > int4range(1,5)	t
<=	less than or equal 小于等于	numrange(1.1,2.2) <= numrange(1.1,2.2)	t
>=	greater than or equal 大于等于	numrange(1.1,2.2) >= numrange(1.1,2.0)	t
@>	contains range 包含	int4range(2,4) @> int4range(2,3)	t
@>	contains element 包含	'[2011-01-01,2011-03-01)'::tsrange @> '2011-01-10'::timestamp	t
<@	range is contained by 被包含	int4range(2,4) <@ int4range(1,7)	t
<@	element is contained by 被包含	42 <@ int4range(1,7)	f
&&	overlap (have points in common)交集	int8range(3,7) && int8range(4,12)	t
<<	strictly left of 完全小于	int8range(1,10) << int8range(100,110)	t
>>	strictly right of 完全大于	int8range(50,60) >> int8range(20,30)	t
&<	没有延伸到	int8range(1,20) &< int8range(18,20)	t
&>	没有延伸到	int8range(7,20) &> int8range(5,10)	t
-|-	毗邻	numrange(1.1,2.2) -|- numrange(2.2,3.3)	t
+	并集	numrange(5,15) + numrange(10,20)	[5,20)
*	交集	int8range(5,15) * int8range(10,20)	[10,15)
-	差异	int8range(5,15) - int8range(10,20)	[5,10)

Function	Return Type	Description	Example	Result
lower(anyrange)	range's element type	范围下界	lower(numrange(1.1,2.2))	1.1
upper(anyrange)	range's element type	范围上限	upper(numrange(1.1,2.2))	2.2
isempty(anyrange)	boolean	range是否为空	isempty(numrange(1.1,2.2))	false
lower_inc(anyrange)	boolean	下限是否包含在内	lower_inc(numrange(1.1,2.2))	true
upper_inc(anyrange)	boolean	上限是否包含在内	upper_inc(numrange(1.1,2.2))	false
lower_inf(anyrange)	boolean	下界是否是无限的	lower_inf('(,)'::daterange)	true
upper_inf(anyrange)	boolean	上界是否是无限的	upper_inf('(,)'::daterange)	true
range_merge(anyrange,anyrange)	anyrange	包含给定范围的最小范围	range_merge('[1,2)'::int4range, '[3,4)'::int4range)	[1,4)