This function is used to return the positive and negative signs corresponding to a.
Syntax
sign(DOUBLE a)
Parameters
Parameter |
Mandatory |
Type |
Description |
|---|---|---|---|
a |
Yes |
DOUBLE, BIGINT, DECIMAL, or STRING |
The value can be a float, integer, or string. |
Return Values
The return value is of the DOUBLE type.
- If the value of a is a positive number, 1 is returned.
- If the value of a is a negative number, -1 is returned.
- If the value of a is 0, 0 is returned.
- If the value of a is NULL, NULL is returned.
Example Code
The value -1 is returned.
select sign(-3);
The value 1 is returned.
select sign(3);
The value 0 is returned.
select sign(0);
The value 1 is returned.
select sign(3.1415926);
The value NULL is returned.
select sign(null);