SQL Server/T-SQL/Math Functions/ROUND

ROUND(100.345678,5,1)

2> SELECT ROUND(100.345678,5,1)
3> GO
-----------
 100.345670
(1 rows affected)

ROUND(107.345678,-1,0)

2> SELECT ROUND(107.345678,-1,0)
3> GO
-----------
 110.000000
(1 rows affected)

ROUND: Rounds a value to the number of decimal places specified in the second parameter

2> -- ROUND: Rounds a value to the number of decimal places specified in the second parameter.
3>
4> -- ROUND(number_to_round, number_ of_places,[0|1])
5>
6> SELECT ROUND(100.345678,5,0)
7> GO
-----------
 100.345680
(1 rows affected)

Round the updated data

1> create table employee(
2>     ID          int,
3>     name        nvarchar (10),
4>     salary      int,
5>     start_date  datetime,
6>     city        nvarchar (10),
7>     region      char (1))
8> GO
1>
2> insert into employee (ID, name,    salary, start_date, city,       region)
3>               values (1,  "Jason", 40420,  "02/01/94", "New York", "W")
4> GO
(1 rows affected)
1> insert into employee (ID, name,    salary, start_date, city,       region)
2>               values (2,  "Robert",14420,  "01/02/95", "Vancouver","N")
3> GO
(1 rows affected)
1> insert into employee (ID, name,    salary, start_date, city,       region)
2>               values (3,  "Celia", 24020,  "12/03/96", "Toronto",  "W")
3> GO
(1 rows affected)
1> insert into employee (ID, name,    salary, start_date, city,       region)
2>               values (4,  "Linda", 40620,  "11/04/97", "New York", "N")
3> GO
(1 rows affected)
1> insert into employee (ID, name,    salary, start_date, city,       region)
2>               values (5,  "David", 80026,  "10/05/98", "Vancouver","W")
3> GO
(1 rows affected)
1> insert into employee (ID, name,    salary, start_date, city,       region)
2>               values (6,  "James", 70060,  "09/06/99", "Toronto",  "N")
3> GO
(1 rows affected)
1> insert into employee (ID, name,    salary, start_date, city,       region)
2>               values (7,  "Alison",90620,  "08/07/00", "New York", "W")
3> GO
(1 rows affected)
1> insert into employee (ID, name,    salary, start_date, city,       region)
2>               values (8,  "Chris", 26020,  "07/08/01", "Vancouver","N")
3> GO
(1 rows affected)
1> insert into employee (ID, name,    salary, start_date, city,       region)
2>               values (9,  "Mary",  60020,  "06/09/02", "Toronto",  "W")
3> GO
(1 rows affected)
1>
2> select * from employee
3> GO
ID          name       salary      start_date              city       region
----------- ---------- ----------- ----------------------- ---------- ------
          1 Jason            40420 1994-02-01 00:00:00.000 New York   W
          2 Robert           14420 1995-01-02 00:00:00.000 Vancouver  N
          3 Celia            24020 1996-12-03 00:00:00.000 Toronto    W
          4 Linda            40620 1997-11-04 00:00:00.000 New York   N
          5 David            80026 1998-10-05 00:00:00.000 Vancouver  W
          6 James            70060 1999-09-06 00:00:00.000 Toronto    N
          7 Alison           90620 2000-08-07 00:00:00.000 New York   W
          8 Chris            26020 2001-07-08 00:00:00.000 Vancouver  N
          9 Mary             60020 2002-06-09 00:00:00.000 Toronto    W
(9 rows affected)
1>
2> --Round the updated data:
3>
4> UPDATE Employee
5> SET salary = ROUND(salary * 1.1, 2)
6> WHERE city LIKE "N%"
7> GO
(3 rows affected)
1>
2> select * from employee
3> GO
ID          name       salary      start_date              city       region
----------- ---------- ----------- ----------------------- ---------- ------
          1 Jason            44462 1994-02-01 00:00:00.000 New York   W
          2 Robert           14420 1995-01-02 00:00:00.000 Vancouver  N
          3 Celia            24020 1996-12-03 00:00:00.000 Toronto    W
          4 Linda            44682 1997-11-04 00:00:00.000 New York   N
          5 David            80026 1998-10-05 00:00:00.000 Vancouver  W
          6 James            70060 1999-09-06 00:00:00.000 Toronto    N
          7 Alison           99682 2000-08-07 00:00:00.000 New York   W
          8 Chris            26020 2001-07-08 00:00:00.000 Vancouver  N
          9 Mary             60020 2002-06-09 00:00:00.000 Toronto    W
(9 rows affected)
1>
2>
3> drop table employee
4> GO
1>

select ROUND(12.4999,0)

 
3> select ROUND(12.4999,0)
4> GO
--------
 12.0000
(1 rows affected)
1>
2>

select ROUND(12.4999,1)

 
4> select ROUND(12.4999,1)
5> GO
--------
 12.5000
(1 rows affected)
1>
2>

select ROUND(12.4999,-1) (minus)

 
4> select ROUND(12.4999,-1)
5> GO
--------
 10.0000
(1 rows affected)
1>

select ROUND(12.5,0)

 

4>
5> select ROUND(12.5,0)
6> GO
-----
 13.0
(1 rows affected)
1>

select ROUND(12.5,0,1)

 
3> select ROUND(12.5,0,1)
4> GO
-----
 12.0
(1 rows affected)
1>