sign¶
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.
Note
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);