Oracle PL/SQL Tutorial/Introduction/Arithmetic operator
The normal rules of arithmetic operator precedence apply in SQL
The normal rules of arithmetic operator precedence apply in SQL:
multiplication and division are performed first.
followed by addition and subtraction.
If operators of the same precedence are used, they are performed from left to right.
<source lang="sql">
SQL> SELECT 10 * 12 / 3 - 1 FROM dual;
10*12/3-1
39
SQL></source>
Use parentheses () to specify the order of execution for the operators
<source lang="sql">
SQL> SQL> SELECT 10 * (12 / 3 - 1) FROM dual; 10*(12/3-1)
30
SQL></source>