TRUNC and ROUND function looks similar but not exactly.

ROUND function used to round the number to the nearest while TRUNC used to truncate/delete the number from some position. Some cases both returns same result.

SQL> select trunc(25.67),round(25.67) from dual;

TRUNC(25.67)    ROUND(25.67)
————                      ————
25                                    26

Below chart clearly explains the difference

TRUNC ROUND
25.67,0 25 26
25.67,1 25.6 25.7
25.34,1 25.3 25.3
25.34,2 25.34 25.34
25.67,-1 20 30

So next time when you are using TRUNC and ROUND remember that both might give different results !

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