Afronden en afkappen van getallen
SQL Server voor gevorderden
Ginger Grant
Instructor
Getallen afronden in T-SQL
ROUND(number, length [,function])
Getallen afronden 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 |
...
+--------------------+------------------+------------------+
Afronden links van de komma
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 |
...
+--------------------+------------------+------------------+
Getallen afkappen
Afkappen
17.85 $\rightarrow$ 17
Afronden
17.85 $\rightarrow$ 18
Afkappen met ROUND()
De functie ROUND() kan waarden afkappen als je het derde argument opgeeft
ROUND(number, length [,function])
- Zet de derde waarde op een niet-nul getal
Afkappen 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 |
...
+--------------------+------------------+------------------+
Afkappen verwijdert simpelweg alle cijfers na de opgegeven positie
Laten we oefenen!
SQL Server voor gevorderden
