Range Functions and Operators
Range Operators
- =
Example:
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gaussdb=# SELECT int4range(1,5) = '[1,4]'::int4range AS RESULT; result -------- t (1 row)
- <>
Example:
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gaussdb=# SELECT numrange(1.1,2.2) <> numrange(1.1,2.3) AS RESULT; result -------- t (1 row)
- <
Example:
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gaussdb=# SELECT int4range(1,10) < int4range(2,3) AS RESULT; result -------- t (1 row)
- >
Example:
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gaussdb=# SELECT int4range(1,10) > int4range(1,5) AS RESULT; result -------- t (1 row)
- <=
Description: Is less than or equals
Example:
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gaussdb=# SELECT numrange(1.1,2.2) <= numrange(1.1,2.2) AS RESULT; result -------- t (1 row)
- >=
Description: Is greater than or equals
Example:
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gaussdb=# SELECT numrange(1.1,2.2) >= numrange(1.1,2.0) AS RESULT; result -------- t (1 row)
- @>
Example:
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gaussdb=# SELECT int4range(2,4) @> int4range(2,3) AS RESULT; result -------- t (1 row)
- @>
Example:
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gaussdb=# SELECT '[2011-01-01,2011-03-01)'::tsrange @> '2011-01-10'::timestamp AS RESULT; result -------- t (1 row)
- <@
Description: Range is contained by
Example:
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gaussdb=# SELECT int4range(2,4) <@ int4range(1,7) AS RESULT; result -------- t (1 row)
- <@
Description: Element is contained by
Example:
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gaussdb=# SELECT 42 <@ int4range(1,7) AS RESULT; result -------- f (1 row)
- &&
Description: Overlaps (has points in common)
Example:
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gaussdb=# SELECT int8range(3,7) && int8range(4,12) AS RESULT; result -------- t (1 row)
- <<
Example:
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gaussdb=# SELECT int8range(1,10) << int8range(100,110) AS RESULT; result -------- t (1 row)
- >>
Description: Strictly right of
Example:
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gaussdb=# SELECT int8range(50,60) >> int8range(20,30) AS RESULT; result -------- t (1 row)
- &<
Description: Does not extend to the right of
Example:
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gaussdb=# SELECT int8range(1,20) &< int8range(18,20) AS RESULT; result -------- t (1 row)
- &>
Description: Does not extend to the left of
Example:
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gaussdb=# SELECT int8range(7,20) &> int8range(5,10) AS RESULT; result -------- t (1 row)
- -|-
Example:
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gaussdb=# SELECT numrange(1.1,2.2) -|- numrange(2.2,3.3) AS RESULT; result -------- t (1 row)
- +
Example:
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gaussdb=# SELECT numrange(5,15) + numrange(10,20) AS RESULT; result -------- [5,20) (1 row)
- *
Example:
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gaussdb=# SELECT int8range(5,15) * int8range(10,20) AS RESULT; result --------- [10,15) (1 row)
- -
Example:
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gaussdb=# 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
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.
- numrange(numeric, numeric, [text])
Description: Specifies a range.
Return type: Range's element type
Example:
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gaussdb=# SELECT numrange(1.1,2.2) AS RESULT; result -------- [1.1,2.2) (1 row) gaussdb=# SELECT numrange(1.1,2.2, '()') AS RESULT; result -------- (1.1,2.2) (1 row)
- lower(anyrange)
Description: Lower bound of range
Return type: Range's element type
Example:
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gaussdb=# SELECT lower(numrange(1.1,2.2)) AS RESULT; result -------- 1.1 (1 row)
- upper(anyrange)
Description: Upper bound of range
Return type: range's element type
Example:
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gaussdb=# 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:
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gaussdb=# 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:
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gaussdb=# 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:
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gaussdb=# 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:
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gaussdb=# SELECT lower_inf('(,)'::daterange) AS RESULT; result -------- t (1 row)
- upper_inf(anyrange)
Description: Is the upper bound infinite?
Return type: Boolean
Example:
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gaussdb=# SELECT upper_inf('(,)'::daterange) AS RESULT; result -------- t (1 row)
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