![]() | DATEDIFF | Days | Month | Quarter | Year |īoth functions return null if they are passed the wrong argument type.īoth functions allow you to provide a date as one argument and a datetime as another argument. Here’s another example, this time seeing how it looks when we return months, quarters, and years when the difference is one month (or 31 days): The MYSQL DATEDIFF () function accepts two date or, date-time values as parameters, calculates the difference between them (argument1-argument2) and returns the result. | 0 | 0 | 23 | 1439 | 86399 | 86399000000 |Īnd here’s the result if we increment the 2nd date by one second (which brings it to the next day): As documentation states: Only the date parts of the values are used in the calculation. | DATEDIFF | Days | Hours | Minutes | Seconds | Microseconds | Note if you want to count FULL 24h days between 2 dates, datediff can return wrong values for you. TIMESTAMPDIFF(microsecond, AS 'Microseconds' However the precision of TIMESTAMPDIFF() (and the unit that it compares) still depends on the specified unit. The precision of DATEDIFF() is one day, and TIMESTAMPDIFF() can go down to the microsecond. TIMESTAMPDIFF(microsecond, AS 'TIMESTAMPDIFF' So we could modify the previous example so that TIMESTAMPDIFF() returns the number of hours instead of days: On the other hand, DATEDIFF() doesn’t allow you to specify a unit. Example 2 – Changing the UnitĪs the previous example demonstrates, the TIMESTAMPDIFF() allows you to specify a unit for the results to be returned as (in fact, it requires you to specify the unit). This is because DATEDIFF() subtracts the second date from the first, whereas TIMESTAMPDIFF() subtracts the first date from the second. So both functions return the difference in days, however one result is positive and the other negative. Here’s an example that demonstrates how these functions work, and how the results are different, even when using the same unit. ![]() Result is expressed as the unit provided by the first argument.Ĭan compare only the date value of its arguments.Ĭan compare the date and time value of its arguments. Subtracts the 2nd argument from the 3rd (expr2 − expr1). Subtracts the 2nd argument from the 1st (expr1 − expr2). The following table summarizes the difference between these two functions: DATEDIFF() ![]() ![]() MySQL DATEDIFF() computes and returns the value of date1– date2.This article looks at the difference between two MySQL functions DATEDIFF() and TIMESTAMPDIFF().īoth functions return the difference between two dates and/or times, but the result is different between the two functions. Note that DATEDIFF() calculates the differences by subtracting date2 from date1, i.e. Where, ‘date1’ and ‘date2’ are two date or datetime expressions. Syntax of MySQL DATEDIFF() DATEDIFF(date1, date2) Code language: SQL (Structured Query Language) ( sql ) Let us dive deep and take a look at the syntax before we move on to the examples. In other words, it returns the number of days between two dates. ![]() The MySQL DATEDIFF() function is used to find the difference between two dates or datetime values. Syntax To calculate the difference between two dates, you use the DATEDIFF () function. Let us see how we can use the MySQL DATEDIFF() function to solve this problem. SQL DATEDIFF Summary: in this tutorial, you will learn how to use the SQL DATEDIFF () function to calculate the difference between two dates. But we have a computer and we know MySQL, so let us make things easy for ourselves. Some employees may have joined more than 5 years ago or so and besides, your CEO wants the exact number of days each employee has been in the company. Now doing this manually would be a mammoth task. The CEO of the company has tasked you with finding out how many days have elapsed since each employee joined the company. Suppose you are an HR executive at a company and you have data on the check-in date and time for each employee for today as well as the date they first joined the company in a table. In this tutorial, we will study the MySQL DATEDIFF() function. ![]()
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