How to Select Records with Datetime Greater Than or Equal to Today in MySQL?

How to efficiently query date and time data greater than or equal to today in MySQL?

In database systems, datetime fields are widely used to track timestamps and other time data. When working with datetime data, you often need to compare datetime values ​​with other datetime values ​​or dates. A common task is to select all records whose creation date time column is greater than or equal to the current date.

Question:

How to efficiently retrieve all records from the 'users' table for which the 'created' datetime field is greater than or equal to today's date?

Answer:

In order to compare a datetime field with a date in MySQL, we can use the CURDATE() function. This function returns the current date as a date value. By comparing the 'created' datetime field with CURDATE() we can determine if its date part is greater than or equal to today's date.

The following query demonstrates usage:

<code class="language-sql">SELECT * FROM users WHERE created >= CURDATE();</code>

This query will retrieve all records where the date part of the 'created' datetime field is greater than or equal to today's date.

Additional notes:

It is important to note that the above query will correctly compare the 'created' datetime and the date part of CURDATE(). If a 'created' datetime field contains a time part, that time part will be ignored in the comparison.

If you plan to compare date and time parts, you may want to use other comparison methods, such as the TIMESTAMPDIFF() function, or use DAY(), MONTH(), YEAR(), HOUR (), MINUTE() and other functions extract individual date and time parts for specific date and time comparisons.

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