Range Functions
lower(anyrange)
Description: Lower bound of range
Return type: Range's element type
Example:
1 2 3 4 5 |
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:
1 2 3 4 5 |
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:
1 2 3 4 5 |
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:
1 2 3 4 5 |
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:
1 2 3 4 5 |
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:
1 2 3 4 5 |
SELECT lower_inf('(,)'::daterange) AS RESULT; result -------- t (1 row) |
upper_inf(anyrange)
Description: Is the upper bound infinite?
Return type: boolean.
Example:
1 2 3 4 5 |
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.
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