The role of round in sql
ROUND function is used to round a number to a specified number of decimal places. The syntax is ROUND(number, decimals). Its functions include formatting numbers, calculating based on precision, and creating derived columns with a specified number of decimal places.
The role of ROUND function in SQL
#ROUND function is used to round the specified number to the specified number of decimal places . It accepts two parameters: the number to round and the target number of decimal places.
Syntax
ROUND(number, decimals)
Parameters
- number: The number or expression to be rounded Mode.
- decimals: The target number of decimal places to round to. Can be a positive or negative integer.
Rounding Rules
- If the decimal part is 0.5 or greater, the number will be rounded up.
- If the decimal part is less than 0.5, the number will be rounded down.
- If the target number of decimal places is negative, the function will remove numbers with more than the specified number of decimal places.
Examples
Here are some examples of rounding:
| Enter | decimals | Output |
|---|---|---|
| 0 | 12 | |
| 1 | 12.3 | |
| 2 | 12.35 | |
| -1 | 10 |
ROUND function is widely used in the following scenarios:
Format numbers for display.- Calculate according to the specified precision.
- Create a derived column with a specific number of decimal places.
The decimals argument can contain decimals, allowing for more precise rounding.
- ROUND function does not change the actual value of the input number, it only returns the rounded value.
- For cases where more complex rounding rules are required, consider using other functions such as CEILING or FLOOR.
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