Range Functions and Operators
Range Operators
=
Description: Equals
Example:
openGauss=# SELECT int4range(1,5) = '[1,4]'::int4range AS RESULT; result -------- t (1 row)<>
Description: Does not equal to
Example:
openGauss=# SELECT numrange(1.1,2.2) <> numrange(1.1,2.3) AS RESULT; result -------- t (1 row)<
Description: Is less than
Example:
openGauss=# SELECT int4range(1,10) < int4range(2,3) AS RESULT; result -------- t (1 row)>
Description: Is greater than
Example:
openGauss=# SELECT int4range(1,10) > int4range(1,5) AS RESULT; result -------- t (1 row)<=
Description: Is less than or equals
Example:
openGauss=# SELECT numrange(1.1,2.2) <= numrange(1.1,2.2) AS RESULT; result -------- t (1 row)>=
Description: Is greater than or equals
Example:
openGauss=# SELECT numrange(1.1,2.2) >= numrange(1.1,2.0) AS RESULT; result -------- t (1 row)@>
Description: Contains ranges
Example:
openGauss=# SELECT int4range(2,4) @> int4range(2,3) AS RESULT; result -------- t (1 row)@>
Description: Contains elements
Example:
openGauss=# SELECT '[2011-01-01,2011-03-01)'::tsrange @> '2011-01-10'::timestamp AS RESULT; result -------- t (1 row)<@
Description: Range is contained by
Example:
openGauss=# SELECT int4range(2,4) <@ int4range(1,7) AS RESULT; result -------- t (1 row)<@
Description: Element is contained by
Example:
openGauss=# SELECT 42 <@ int4range(1,7) AS RESULT; result -------- f (1 row)&&
Description: Overlap (have points in common)
Example:
openGauss=# SELECT int8range(3,7) && int8range(4,12) AS RESULT; result -------- t (1 row)«
Description: Strictly left of
Example:
openGauss=# SELECT int8range(1,10) << int8range(100,110) AS RESULT; result -------- t (1 row)>>
Description: Strictly right of
Example:
openGauss=# SELECT int8range(50,60) >> int8range(20,30) AS RESULT; result -------- t (1 row)&<
Description: Does not extend to the right of
Example:
openGauss=# SELECT int8range(1,20) &< int8range(18,20) AS RESULT; result -------- t (1 row)&>
Description: Does not extend to the left of
Example:
openGauss=# SELECT int8range(7,20) &> int8range(5,10) AS RESULT; result -------- t (1 row)-|-
Description: Is adjacent to
Example:
openGauss=# SELECT numrange(1.1,2.2) -|- numrange(2.2,3.3) AS RESULT; result -------- t (1 row)
Description: Union
Example:
```
openGauss=# SELECT numrange(5,15) + numrange(10,20) AS RESULT;
result
--------
[5,20)
(1 row)
```
*
Description: Intersection
Example:
openGauss=# SELECT int8range(5,15) * int8range(10,20) AS RESULT; result --------- [10,15) (1 row)
Description: Difference
Example:
```
openGauss=# SELECT int8range(5,15) - int8range(10,20) AS RESULT;
result
--------
[5,10)
(1 row)
```
The simple comparison operators <, >, <=, and >= compare the lower bounds first, and only if those are equal, compare the upper bounds.
The «, >>, and -|- 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 sub-ranges.
Range Functions
numrange(numeric, numeric, [text])
Description: Specifies a range.
Return type: Range's element type
Example:
openGauss=# SELECT numrange(1.1,2.2) AS RESULT; result -------- [1.1,2.2) (1 row) openGauss=# SELECT numrange(1.1,2.2, '()') AS RESULT; result -------- (1.1,2.2) (1 row)lower(anyrange)
Description: Lower bound of a range
Return type: Range's element type
Example:
openGauss=# SELECT lower(numrange(1.1,2.2)) AS RESULT; result -------- 1.1 (1 row)upper(anyrange)
Description: Upper bound of a range
Return type: Range's element type
Example:
openGauss=# SELECT upper(numrange(1.1,2.2)) AS RESULT; result -------- 2.2 (1 row)isempty(anyrange)
Description: Is the range empty?
Return type: Boolean
Example:
openGauss=# SELECT isempty(numrange(1.1,2.2)) AS RESULT; result -------- f (1 row)lower_inc(anyrange)
Description: Is the lower bound inclusive?
Return type: Boolean
Example:
openGauss=# SELECT lower_inc(numrange(1.1,2.2)) AS RESULT; result -------- t (1 row)upper_inc(anyrange)
Description: Is the upper bound inclusive?
Return type: Boolean
Example:
openGauss=# SELECT upper_inc(numrange(1.1,2.2)) AS RESULT; result -------- f (1 row)lower_inf(anyrange)
Description: Is the lower bound infinite?
Return type: Boolean
Example:
openGauss=# SELECT lower_inf('(,)'::daterange) AS RESULT; result -------- t (1 row)upper_inf(anyrange)
Description: Is the upper bound infinite?
Return type: Boolean
Example:
openGauss=# SELECT upper_inf('(,)'::daterange) AS RESULT; result -------- t (1 row)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.
elem_contained_by_range(anyelement, anyrange)
Description: Determines whether an element is within the range.
Return type: Boolean
Example:
openGauss=# SELECT elem_contained_by_range('2', numrange(1.1,2.2)); elem_contained_by_range ------------------------- t (1 row)