SQL Server/T-SQL Tutorial/Math Functions/ROUND

Rounding present value to two decimal places.

4>
5>
6> SELECT ROUND(1464*(1/POWER((1+.10),4)),2)
7> GO
----------------------------------------
     1002.740000000000000000000000000000
(1 rows affected)
1>

ROUND(salary *

3> CREATE TABLE employee(
4>    id          INTEGER NOT NULL PRIMARY KEY,
5>    first_name  VARCHAR(10),
6>    last_name   VARCHAR(10),
7>    salary      DECIMAL(10,2),
8>    start_Date  DATETIME,
9>    region      VARCHAR(10),
10>    city        VARCHAR(20),
11>    managerid   INTEGER
12> );
13> GO
1> INSERT INTO employee VALUES (1, "Jason" ,  "Martin", 5890,"2005-03-22","North","Vancouver",3);
2> GO
(1 rows affected)
1> INSERT INTO employee VALUES (2, "Alison",  "Mathews",4789,"2003-07-21","South","Utown",4);
2> GO
(1 rows affected)
1> INSERT INTO employee VALUES (3, "James" ,  "Smith",  6678,"2001-12-01","North","Paris",5);
2> GO
(1 rows affected)
1> INSERT INTO employee VALUES (4, "Celia" ,  "Rice",   5567,"2006-03-03","South","London",6);
2> GO
(1 rows affected)
1> INSERT INTO employee VALUES (5, "Robert",  "Black",  4467,"2004-07-02","East","Newton",7);
2> GO
(1 rows affected)
1> INSERT INTO employee VALUES (6, "Linda" ,  "Green" , 6456,"2002-05-19","East","Calgary",8);
2> GO
(1 rows affected)
1> INSERT INTO employee VALUES (7, "David" ,  "Larry",  5345,"2008-03-18","West","New York",9);
2> GO
(1 rows affected)
1> INSERT INTO employee VALUES (8, "James" ,  "Cat",    4234,"2007-07-17","West","Regina",9);
2> GO
(1 rows affected)
1> INSERT INTO employee VALUES (9, "Joan"  ,  "Act",    6123,"2001-04-16","North","Toronto",10);
2> GO
(1 rows affected)
1>
2> select * from employee;
3> GO
id          first_name last_name  salary       start_Date              region     city                 managerid
----------- ---------- ---------- ------------ ----------------------- ---------- -------------------- -----------
          1 Jason      Martin          5890.00 2005-03-22 00:00:00.000 North      Vancouver                      3
          2 Alison     Mathews         4789.00 2003-07-21 00:00:00.000 South      Utown                          4
          3 James      Smith           6678.00 2001-12-01 00:00:00.000 North      Paris                          5
          4 Celia      Rice            5567.00 2006-03-03 00:00:00.000 South      London                         6
          5 Robert     Black           4467.00 2004-07-02 00:00:00.000 East       Newton                         7
          6 Linda      Green           6456.00 2002-05-19 00:00:00.000 East       Calgary                        8
          7 David      Larry           5345.00 2008-03-18 00:00:00.000 West       New York                       9
          8 James      Cat             4234.00 2007-07-17 00:00:00.000 West       Regina                         9
          9 Joan       Act             6123.00 2001-04-16 00:00:00.000 North      Toronto                       10
(9 rows affected)
1>
2>
3> UPDATE Employee
4> SET salary = ROUND(salary * 1.1, 2)
5> GO
(9 rows affected)
1>
2> select * from employee;
3> GO
id          first_name last_name  salary       start_Date              region     city                 managerid
----------- ---------- ---------- ------------ ----------------------- ---------- -------------------- -----------
          1 Jason      Martin          6479.00 2005-03-22 00:00:00.000 North      Vancouver                      3
          2 Alison     Mathews         5267.90 2003-07-21 00:00:00.000 South      Utown                          4
          3 James      Smith           7345.80 2001-12-01 00:00:00.000 North      Paris                          5
          4 Celia      Rice            6123.70 2006-03-03 00:00:00.000 South      London                         6
          5 Robert     Black           4913.70 2004-07-02 00:00:00.000 East       Newton                         7
          6 Linda      Green           7101.60 2002-05-19 00:00:00.000 East       Calgary                        8
          7 David      Larry           5879.50 2008-03-18 00:00:00.000 West       New York                       9
          8 James      Cat             4657.40 2007-07-17 00:00:00.000 West       Regina                         9
          9 Joan       Act             6735.30 2001-04-16 00:00:00.000 North      Toronto                       10
(9 rows affected)
1>
2>
3> drop table employee;
4> GO
1>

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

ROUND(number_to_round, number_ of_places,[0|1])
A numeric of anything but 0 will mean the number is truncated.
9>
10> SELECT ROUND(100.345678,5,0)
11> GO
-----------
 100.345680
(1 rows affected)
1> SELECT ROUND(100.345678,5,1)
2> GO
-----------
 100.345670
(1 rows affected)
1> SELECT ROUND(107.345678,-1,0)
2> GO
-----------
 110.000000
(1 rows affected)

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)

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>

SELECT ROUND(3. RoundedNumber

3>
4> SELECT ROUND(3.22245, 3) RoundedNumber
5> GO
RoundedNumber
-------------
      3.22200
(1 rows affected)