sql - DATEDIFF function in Oracle

Question

I need to use Oracle but DATEDIFF function doesn't work in Oracle DB.

How to write the following code in Oracle? I saw some examples using INTERVAL or TRUNC.

SELECT DATEDIFF ('2000-01-01','2000-01-02') AS DateDiff;

Answer 1

In Oracle, you can simply subtract two dates and get the difference in days. Also note that unlike SQL Server or MySQL, in Oracle you cannot perform a select statement without a from clause. One way around this is to use the builtin dummy table, dual:

SELECT TO_DATE('2000-01-02', 'YYYY-MM-DD') -  
       TO_DATE('2000-01-01', 'YYYY-MM-DD') AS DateDiff
FROM   dual