SELECT TRUNC(15.79,1) "Truncate" FROM DUAL;
Truncate
----------
15.7
SELECT TRUNC(15.79,-1) "Truncate" FROM DUAL;
Truncate
----------
10
The following example rounds a number to one decimal point:
SELECT ROUND(15.193,1) "Round" FROM DUAL;
Round
----------
15.2
SELECT ROUND(15.193,-1) "Round" FROM DUAL;
Round
----------
20
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