# SIGN() Function in MySQL

• Last Updated : 28 Sep, 2020

SIGN() function in MySQL is used to return the sign of the given number. It returns 1 if the number is positive, -1 if the number is negative and 0 for zero.

Syntax :

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```
SIGN(X)
```

Parameter :
SIGN() function accepts one parameter as input and will give you the results in values like Positive(+1),Negative(-1) and Zero(0).

• X –A number whose sign we want to check.

Returns –
It returns the value of sign of the given number i.e. Positive(+1), Negative(-1) and Zero(0).

Example-1 :
Applying SIGN() function to Zero.

```SELECT SIGN(0) AS Sign_Val;
```

Output :

Sign_Val
0

Example-2 :
Applying SIGN() function to a positive number.

```SELECT SIGN(12) AS Sign_Val;
```

Output :

Sign_Val
1

Example-3 :
Applying SIGN() function to a negative number.

```SELECT SIGN(-2) AS Sign_Val;
```
Sign_Val
-1

Example-4 :
Applying SIGN() function to a numeric column in a table.

Table -Number

X
+12
1.8
0
-1.8
-14
```SELECT X, SIGN(X) AS X_Sign  FROM Number;
```

Output :

XX_Sign
121
1.81
00
-1.8-1
-14-1
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