MySQL Functions :
MySQL has many built-in functions.
This reference contains the string, numeric, date, and advanced functions in MySQL.
MySQL String Functions
| Function | Description |
| ASCII | Returns the number code that represents the specific character |
| CHAR_LENGTH | Returns the length of the specified string (in characters) |
| CHARACTER_LENGTH | Returns the length of the specified string (in characters) |
| CONCAT | Concatenates two or more expressions together |
| CONCAT_WS | Concatenates two or more expressions together and adds a separator between them |
| FIELD | Returns the position of a value in a list of values |
| FIND_IN_SET | Returns the position of a string in a string list |
| FORMAT | Formats a number as a format of “#,###.##”, rounding it to a certain number of decimal places |
| INSERT | Inserts a substring into a string at a specified position for a certain number of characters |
| INSTR | Returns the position of the first occurrence of a string in another string |
| LCASE | Converts a string to lower-case |
| LEFT | Extracts a substring from a string (starting from left) |
| LENGTH | Returns the length of the specified string (in bytes) |
| LOCATE | Returns the position of the first occurrence of a substring in a string |
| LOWER | Converts a string to lower-case |
| LPAD | Returns a string that is left-padded with a specified string to a certain length |
| LTRIM | Removes leading spaces from a string |
| MID | Extracts a substring from a string (starting at any position) |
| POSITION | Returns the position of the first occurrence of a substring in a string |
| REPEAT | Repeats a string a specified number of times |
| REPLACE | Replaces all occurrences of a specified string |
| REVERSE | Reverses a string and returns the result |
| RIGHT | Extracts a substring from a string (starting from right) |
| RPAD | Returns a string that is right-padded with a specified string to a certain length |
| RTRIM | Removes trailing spaces from a string |
| SPACE | Returns a string with a specified number of spaces |
| STRCMP | Tests whether two strings are the same |
| SUBSTR | Extracts a substring from a string (starting at any position) |
| SUBSTRING | Extracts a substring from a string (starting at any position) |
| SUBSTRING_INDEX | Returns the substring of string before number of occurrences of delimiter |
| TRIM | Removes leading and trailing spaces from a string |
| UCASE | Converts a string to upper-case |
| UPPER | Converts a string to upper-case |
MySQL Numeric Functions
| Function | Description |
| ABS | Returns the absolute value of a number |
| ACOS | Returns the arc cosine of a number |
| ASIN | Returns the arc sine of a number |
| ATAN | Returns the arc tangent of a number or the arc tangent of n and m |
| ATAN2 | Returns the arc tangent of n and m |
| AVG | Returns the average value of an expression |
| CEIL | Returns the smallest integer value that is greater than or equal to a number |
| CEILING | Returns the smallest integer value that is greater than or equal to a number |
| COS | Returns the cosine of a number |
| COT | Returns the cotangent of a number |
| COUNT | Returns the number of records in a select query |
| DEGREES | Converts a radian value into degrees |
| DIV | Used for integer division |
| EXP | Returns e raised to the power of number |
| FLOOR | Returns the largest integer value that is less than or equal to a number |
| GREATEST | Returns the greatest value in a list of expressions |
| LEAST | Returns the smallest value in a list of expressions |
| LN | Returns the natural logarithm of a number |
| LOG | Returns the natural logarithm of a number or the logarithm of a number to a specified base |
| LOG10 | Returns the base-10 logarithm of a number |
| LOG2 | Returns the base-2 logarithm of a number |
| MAX | Returns the maximum value of an expression |
| MIN | Returns the minimum value of an expression |
| MOD | Returns the remainder of n divided by m |
| PI | Returns the value of PI displayed with 6 decimal places |
| POW | Returns m raised to the nth power |
| POWER | Returns m raised to the nth power |
| RADIANS | Converts a value in degrees to radians |
| RAND | Returns a random number or a random number within a range |
| ROUND | Returns a number rounded to a certain number of decimal places |
| SIGN | Returns a value indicating the sign of a number |
| SIN | Returns the sine of a number |
| SQRT | Returns the square root of a number |
| SUM | Returns the summed value of an expression |
| TAN | Returns the tangent of a number |
| TRUNCATE | Returns a number truncated to a certain number of decimal places |
MySQL Date Functions
| Function | Description |
| ADDDATE | Returns a date after a certain time/date interval has been added |
| ADDTIME | Returns a time/datetime after a certain time interval has been added |
| CURDATE | Returns the current date |
| CURRENT_DATE | Returns the current date |
| CURRENT_TIME | Returns the current time |
| CURRENT_TIMESTAMP | Returns the current date and time |
| CURTIME | Returns the current time |
| DATE | Extracts the date value from a date or datetime expression |
| DATEDIFF | Returns the difference in days between two date values |
| DATE_ADD | Returns a date after a certain time/date interval has been added |
| DATE_FORMAT | Formats a date as specified by a format mask |
| DATE_SUB | Returns a date after a certain time/date interval has been subtracted |
| DAY | Returns the day portion of a date value |
| DAYNAME | Returns the weekday name for a date |
| DAYOFMONTH | Returns the day portion of a date value |
| DAYOFWEEK | Returns the weekday index for a date value |
| DAYOFYEAR | Returns the day of the year for a date value |
| EXTRACT | Extracts parts from a date |
| FROM_DAYS | Returns a date value from a numeric representation of the day |
| HOUR | Returns the hour portion of a date value |
| LAST_DAY | Returns the last day of the month for a given date |
| LOCALTIME | Returns the current date and time |
| LOCALTIMESTAMP | Returns the current date and time |
| MAKEDATE | Returns the date for a certain year and day-of-year value |
| MAKETIME | Returns the time for a certain hour, minute, second combination |
| MICROSECOND | Returns the microsecond portion of a date value |
| MINUTE | Returns the minute portion of a date value |
| MONTH | Returns the month portion of a date value |
| MONTHNAME | Returns the full month name for a date |
| NOW | Returns the current date and time |
| PERIOD_ADD | Takes a period and adds a specified number of months to it |
| PERIOD_DIFF | Returns the difference in months between two periods |
| QUARTER | Returns the quarter portion of a date value |
| SECOND | Returns the second portion of a date value |
| SEC_TO_TIME | Converts numeric seconds into a time value |
| STR_TO_DATE | Takes a string and returns a date specified by a format mask |
| SUBDATE | Returns a date after which a certain time/date interval has been subtracted |
| SUBTIME | Returns a time/datetime value after a certain time interval has been subtracted |
| SYSDATE | Returns the current date and time |
| TIME | Extracts the time value from a time/datetime expression |
| TIME_FORMAT | Formats a time as specified by a format mask |
| TIME_TO_SEC | Converts a time value into numeric seconds |
| TIMEDIFF | Returns the difference between two time/datetime values |
| TIMESTAMP | Converts an expression to a datetime value and if specified adds an optional time interval to the value |
| TO_DAYS | Converts a date into numeric days |
| WEEK | Returns the week portion of a date value |
| WEEKDAY | Returns the weekday index for a date value |
| WEEKOFYEAR | Returns the week of the year for a date value |
| YEAR | Returns the year portion of a date value |
| YEARWEEK | Returns the year and week for a date value |
MySQL Advanced Functions
| Function | Description |
| BIN | Converts a decimal number to a binary number |
| BINARY | Converts a value to a binary string |
| CASE | Lets you evaluate conditions and return a value when the first condition is met |
| CAST | Converts a value from one datatype to another datatype |
| COALESCE | Returns the first non-null expression in a list |
| CONNECTION_ID | Returns the unique connection ID for the current connection |
| CONV | Converts a number from one number base to another |
| CONVERT | Converts a value from one datatype to another, or one character set to another |
| CURRENT_USER | Returns the user name and host name for the MySQL account used by the server to authenticate the current client |
| DATABASE | Returns the name of the default database |
| IF | Returns one value if a condition is TRUE, or another value if a condition is FALSE |
| IFNULL | Lets you to return an alternate value if an expression is NULL |
| ISNULL | Tests whether an expression is NULL |
| LAST_INSERT_ID | Returns the first AUTO_INCREMENT value that was set by the most recent INSERT or UPDATE statement |
| NULLIF | Compares two expressions |
| SESSION_USER | Returns the user name and host name for the current MySQL user |
| SYSTEM_USER | Returns the user name and host name for the current MySQL user |
| USER | Returns the user name and host name for the current MySQL user |
| VERSION | Returns the version of the MySQL databases |