How to use the datediff function in sql

The DATEDIFF function calculates the difference in the number of days between two dates. Syntax: DATEDIFF(interval, start_date, end_date). interval Indicates interval units (year, month, day, etc.). start_date and end_date are the start and end dates.

How to use DATEDIFF function in SQL

The DATEDIFF function is used to calculate the difference in the number of days between two dates. The syntax is as follows:

 <code class="sql">DATEDIFF(interval, start_date, end_date)</code>

in:

• interval : interval unit, which can be YEAR , MONTH , DAY , HOUR , MINUTE , or SECOND .
• start_date : start date.
• end_date : End date.

Here are some examples of the usage of the DATEDIFF function:

Calculate the difference in the number of days between two dates

 <code class="sql">SELECT DATEDIFF(DAY, '2023-03-01', '2023-04-01');</code>

Return: 28

Calculate the difference in the number of months between two dates

 <code class="sql">SELECT DATEDIFF(MONTH, '2023-01-01', '2023-03-01');</code>

Return: 2

Calculate the year difference between two dates

 <code class="sql">SELECT DATEDIFF(YEAR, '2020-01-01', '2023-03-01');</code>

Return: 3

Notice:

• The DATEDIFF function returns an integer representing the interval between two dates.
• If start_date is greater than end_date , the function returns a negative value.
• The DATEDIFF function does not support TIME or DATETIME data types.

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