select date '1997-08-11' - interval '3' month as col_3 : Date Arithmetic « Date Timestamp Functions « Oracle PL/SQL Tutorial

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Oracle PL/SQL Tutorial » Date Timestamp Functions » Date Arithmetic 
13. 26. 5. select date '1997-08-11' - interval '3' month as col_3
SQL>
SQL>
SQL> select date '1997-08-11' - interval '3' month as col_3
  2  from   dual;

COL_3
---------
11-MAY-97

SQL>
13. 26. Date Arithmetic
13. 26. 1. Using Date Arithmetic
13. 26. 2. Subtracts two days from August 2, 2003
13. 26. 3. Subtract one date from another, yielding the number of days between the two dates.
13. 26. 4. select date '1996-01-29' + interval '1' month as col_1
13. 26. 5. select date '1997-08-11' - interval '3' month as col_3
13. 26. 6. Second Tuesday of the Month
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