See Section 8.17 for an overview of range types.
Table 9.50 shows the operators available for range types.
Table 9.50. Range Operators
Operator  Description  Example  Result 

= 
equal  int4range(1,5) =
'[1,4]'::int4range 
t 
<> 
not equal  numrange(1.1,2.2) <>
numrange(1.1,2.3) 
t 
< 
less than  int4range(1,10) <
int4range(2,3) 
t 
> 
greater than  int4range(1,10) >
int4range(1,5) 
t 
<= 
less than or equal  numrange(1.1,2.2) <=
numrange(1.1,2.2) 
t 
>= 
greater than or equal  numrange(1.1,2.2) >=
numrange(1.1,2.0) 
t 
@> 
contains range  int4range(2,4) @>
int4range(2,3) 
t 
@> 
contains element  '[20110101,20110301)'::tsrange @>
'20110110'::timestamp 
t 
<@ 
range is contained by  int4range(2,4) <@
int4range(1,7) 
t 
<@ 
element is contained by  42 <@
int4range(1,7) 
f 
&& 
overlap (have points in common)  int8range(3,7) &&
int8range(4,12) 
t 
<< 
strictly left of  int8range(1,10) <<
int8range(100,110) 
t 
>> 
strictly right of  int8range(50,60) >>
int8range(20,30) 
t 
&< 
does not extend to the right of  int8range(1,20) &<
int8range(18,20) 
t 
&> 
does not extend to the left of  int8range(7,20) &>
int8range(5,10) 
t 
 
is adjacent to  numrange(1.1,2.2) 
numrange(2.2,3.3) 
t 
+ 
union  numrange(5,15) +
numrange(10,20) 
[5,20) 
* 
intersection  int8range(5,15) *
int8range(10,20) 
[10,15) 
 
difference  int8range(5,15) 
int8range(10,20) 
[5,10) 
The simple comparison operators <
, >
,
<=
, and >=
compare the lower bounds first, and only
if those are equal, compare the upper bounds. These comparisons
are not usually very useful for ranges, but are provided to allow
Btree indexes to be constructed on ranges.
The leftof/rightof/adjacent operators always return false when an empty range is involved; that is, an empty range is not considered to be either before or after any other range.
The union and difference operators will fail if the resulting range would need to contain two disjoint subranges, as such a range cannot be represented.
Table 9.51 shows the functions available for use with range types.
Table 9.51. Range Functions
Function  Return Type  Description  Example  Result 


range's element type  lower bound of range  lower(numrange(1.1,2.2)) 
1.1 

range's element type  upper bound of range  upper(numrange(1.1,2.2)) 
2.2 

boolean 
is the range empty?  isempty(numrange(1.1,2.2)) 
false 

boolean 
is the lower bound inclusive?  lower_inc(numrange(1.1,2.2)) 
true 

boolean 
is the upper bound inclusive?  upper_inc(numrange(1.1,2.2)) 
false 

boolean 
is the lower bound infinite?  lower_inf('(,)'::daterange) 
true 

boolean 
is the upper bound infinite?  upper_inf('(,)'::daterange) 
true 

anyrange 
the smallest range which includes both of the given ranges  range_merge('[1,2)'::int4range,
'[3,4)'::int4range) 
[1,4) 
The lower
and upper
functions return null if the range is
empty or the requested bound is infinite. The lower_inc
, upper_inc
, lower_inf
, and upper_inf
functions all return false for an
empty range.
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