SQL - Date Functions
The following table lists the most important built-in date functions in MySQL:
| Function | Description |
|---|---|
| NOW() | Returns the current date and time |
| CURDATE() | Returns the current date |
| CURTIME() | Returns the current time |
| DATE() | Extracts the date part of a date or date/time expression |
| EXTRACT() | Returns a single part of a date/time |
| DATE_ADD() | Adds a specified time interval to a date |
| DATE_SUB() | Subtracts a specified time interval from a date |
| DATEDIFF() | Returns the number of days between two dates |
| DATE_FORMAT() | Displays date/time data in different formats |
SQL - Aggregate Functions
SQL aggregate functions return a single value, calculated from values in a column.
| Function | Description |
|---|---|
| AVG() | Returns the average value |
| COUNT() | Returns the number of rows |
| FIRST() | Returns the first value |
| LAST() | Returns the last value |
| MAX() | Returns the largest value |
| MIN() | Returns the smallest value |
| ROUND() | Rounds a numeric field to the number of decimals specified |
| SUM() | Returns the sum |
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