round function

The round function rounds the value of an input expression to the specified decimal places to the right of the decimal point.

Syntax:

double round(n [, d ])

Semantics:

n, d: The arguments n and d are expressions that resolve to numbers. The value of d must be in the range of -30 <=d<=30. Any value of d exceeding the maximum absolute value of 30 is truncated to 30 or -30 respectively. If d is not an integer, it is cast to an integer value.
For example, round(123.456,1.5) is considered round(123.456,1), and round(123.456,50) is treated as round(123.456,30).
return type: double.
Depending on the values of n and d, the round function behaves as follows:
- If d is a positive value, the function rounds n to d places on the right of the decimal point. If the fractional part of n is 0.5 or greater, the value is rounded away from 0.
  For example, round(0.5) returns 1.0 and round(-0.5) returns -1.0.
- If d is greater than or equal the number of digits to the right of the decimal point in n, the value of n is returned.
- If d is not specified or zero, the function rounds n to zero decimal places.
- If d is a negative value, the function rounds n to the left of the decimal point. If the number of digits in n to the left of the decimal point is less than or equal to the absolute value of d, then the function returns 0.0.
- Returns zero if n is zero, regardless of the value of d (except when d is NULL).
- Returns a NULL value in the following cases:
  - If either of the arguments is a NULL value
  - If either of the arguments does not resolve to a number
- Returns n if either of the arguments resolves to a NaN or infinity.

Example 12-89 round function

SELECT round(n,d) FROM Userstocks