How Can I Calculate Date Differences in Oracle Without DATEDIFF?

Alternative Date Calculation Methods in Oracle

Although the DATEDIFF function is not natively supported in Oracle, there are several alternative approaches to calculate the difference between two dates:

1. Direct Subtraction: Instead of using a DATEDIFF function, you can directly subtract one date from another using the subtraction (-) operator.

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

2. INTERVAL Operator: The INTERVAL operator allows you to specify a time interval between two dates. For example, to find the difference in days, you would use:

SELECT INTERVAL '2000-01-02' - '2000-01-01' DAY TO DAY AS DateDiff
FROM dual

3. TRUNC Function: The TRUNC function can be used to truncate a date to a specific unit. For example, to find the difference between two dates in whole days, you would use:

SELECT TRUNC('2000-01-02', 'DD') -
       TRUNC('2000-01-01', 'DD') AS DateDiff
FROM dual

By utilizing these alternative methods, you can effectively calculate the date difference between two dates in Oracle without relying on a dedicated DATEDIFF function.

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