Rounding and Truncating numbers
Intermediate SQL Server
Ginger Grant
Instructor
Rounding numbers in T-SQL
ROUND(number, length [,function])
Rounding numbers in T-SQL
SELECT DurationSeconds,
ROUND(DurationSeconds, 0) AS RoundToZero,
ROUND(DurationSeconds, 1) AS RoundToOne
FROM Incidents
+--------------------+------------------+------------------+
|DurationSeconds |RoundToZero |RoundToOne |
+--------------------+------------------+------------------+
|121.6480 |122.0000 |121.6000 |
|170.3976 |170.0000 |170.4000 |
|336.0652 |336.0000 |336.1000 |
...
+--------------------+------------------+------------------+
Rounding on the left side of the decimal
SELECT DurationSeconds,
ROUND(DurationSeconds, -1) AS RoundToTen,
ROUND(DurationSeconds, -2) AS RoundToHundred
FROM Incidents
+--------------------+------------------+------------------+
|DurationSeconds |RoundToTen |RoundToHundred |
+--------------------+------------------+------------------+
|121.6480 |120.0000 |100.0000 |
|170.3976 |170.0000 |200.0000 |
|336.0652 |340.0000 |300.0000 |
...
+--------------------+------------------+------------------+
Truncating numbers
Truncate
17.85 $\rightarrow$ 17
Round
17.85 $\rightarrow$ 18
Truncating with ROUND()
The ROUND() function can be used to truncate values when you specify the third argument
ROUND(number, length [,function])
- Set the third value to a non-zero number
Truncating in T-SQL
SELECT Profit,
ROUND(DurationSeconds, 0) AS RoundingtoWhole,
ROUND(DurationSeconds, 0, 1) AS Truncating
FROM Incidents
+--------------------+------------------+------------------+
|Profit |RoundingtoWhole |Truncating |
+--------------------+------------------+------------------+
|15.6100 |16.0000 |15.0000 |
|13.2444 |13.0000 |13.0000 |
|17.9260 |18.0000 |17.0000 |
...
+--------------------+------------------+------------------+
Truncating just cuts all numbers off after the specified digit
Let's practice!
Intermediate SQL Server
