Chapter 03-Using Single-Row Functions to Customize Output(02)

Number Functions

ROUND:Rounds value to a specified deciaml
TRUNC:Truncates value to a specified decimal
MOD:Returns remainder fo division

Function	Result
ROUND(45.926,2)	45.93
TRUNC(45.926,2)	45.92
MOD(1600,300)	100

Demo-01:Using the ROUND Function

SQL> SELECT ROUND(45.923,2),ROUND(45.923,0),ROUND(45.923,-1) FROM dual;

ROUND(45.923,2) ROUND(45.923,0) ROUND(45.923,-1)
--------------- --------------- ----------------
45.92              46               50

SQL> SELECT ROUND(45.923,2),ROUND(45.923,0),ROUND(45.923,-2) FROM dual;

ROUND(45.923,2) ROUND(45.923,0) ROUND(45.923,-2)
--------------- --------------- ----------------
45.92              46                0

SQL> SELECT ROUND(45.923,2),ROUND(45.923,0),ROUND(75.923,-2) FROM dual;

ROUND(45.923,2) ROUND(45.923,0) ROUND(75.923,-2)
--------------- --------------- ----------------
45.92              46              100

DUAL is a dummy table that you can use to view results from functions and calculations.

Demo-02:Using the TRUNC Functioin

SQL> SELECT TRUNC(45.923,2),TRUNC(45.923),TRUNC(45.923,-1) FROM DUAL;

TRUNC(45.923,2) TRUNC(45.923) TRUNC(45.923,-1)
--------------- ------------- ----------------
45.92            45               40

Demo-03:Using the MOD Function

For all employees with the job title of Sales Representative,calulate the remainder of the salary after it is divided by 5000.

View Code

SQL> select employee_id,job_id ,MOD(salary,5000) from employees where job_id = 'SA_REP';

EMPLOYEE_ID JOB_ID     MOD(SALARY,5000)
----------- ---------- ----------------
150 SA_REP                    0
151 SA_REP                 4500
152 SA_REP                 4000
153 SA_REP                 3000
154 SA_REP                 2500
155 SA_REP                 2000
156 SA_REP                    0
157 SA_REP                 4500
158 SA_REP                 4000
159 SA_REP                 3000
160 SA_REP                 2500

EMPLOYEE_ID JOB_ID     MOD(SALARY,5000)
----------- ---------- ----------------
161 SA_REP                 2000
162 SA_REP                  500
163 SA_REP                 4500
164 SA_REP                 2200
165 SA_REP                 1800
166 SA_REP                 1400
167 SA_REP                 1200
168 SA_REP                 1500
169 SA_REP                    0
170 SA_REP                 4600
171 SA_REP                 2400

EMPLOYEE_ID JOB_ID     MOD(SALARY,5000)
----------- ---------- ----------------
172 SA_REP                 2300
173 SA_REP                 1100
174 SA_REP                 1000
175 SA_REP                 3800
176 SA_REP                 3600
177 SA_REP                 3400
178 SA_REP                 2000
179 SA_REP                 1200

30 rows selected.