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DateDiff is extremely fast... Your problem is you are running it on the database table column value, so the query processor must run the function on every row in the table, even if there was an index on this column. This means it has to load the entire table from disk.
Instead of adding or subtracting units of time from a specified date/time value, the DATEDIFF function retrieves the number of units of time between a start and end time. The DATEDIFF function can also be used in a WHERE clause as well as ORDER BY and HAVING clauses.
Use DATEDIFF in the SELECT <list>, WHERE, HAVING, GROUP BY, and ORDER BY clauses. DATEDIFF implicitly casts string literals as a datetime2 type. In other words, DATEDIFF doesn't support the format YDM when the date is passed as a string.
The DATEDIFF() function returns a value of integer indicating the difference between the start_date and end_date, with the unit specified by date_part. The DATEDIFF() function returns an error if the result is out of range for integer (-2,147,483,648 to +2,147,483,647). In this case, you should use the DATEDIFF_BIG() function instead.
To calculate the difference between two dates, you use the DATEDIFF() function. The following illustrates the syntax of the DATEDIFF() function in SQL Server: DATEDIFF ( datepart , startdate , enddate ) Code language: SQL (Structured Query Language) (sql) Arguments. datepart.
28 cze 2023 · To compare dates in SQL, the most common functions used are DATEDIFF, DATE_ADD, DATE_SUB, and NOW. These functions assist in comparing, adding, subtracting, and getting the current date and time, respectively.
25 sie 2011 · Definition and Usage. The DATEDIFF () function returns the difference between two dates, as an integer. Syntax. DATEDIFF (interval, date1, date2) Parameter Values. Technical Details. More Examples. Example. Return the difference between two date values, in months: SELECT DATEDIFF (month, '2017/08/25', '2011/08/25') AS DateDiff; Try it Yourself »
