What does the vertical pipe slash operator do?
-
20-01-2021 - |
Question
I'm wondering what pipe slash |/
does in,
SET equal_area_radius = |/area/pi();
The statement works and it definitely changes the value:
SELECT |/125.555/pi(); -- returns: 6.32181918120139
SELECT 125.555/pi(); -- returns: 39.9653977598058
What does the pipe-slash operator |/
do?
Solution
The |/
operator calculates the square root
postgres> select |/16, sqrt(16);
?column? | sqrt
----------+------
4 | 4
(1 row)
So |/125.555/pi()
is equivalent to sqrt(125.555/pi())
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