String Functions and Operators¶
See also
Summary of Functions¶
Comparative and regular functions¶
| Operator | Description |
|---|---|
| LIKE | Matches a simple pattern |
| NOT LIKE | Negation of simple pattern matching |
| STRCMP() | Compare two strings |
| NOT REGEXP | Negation of REGEXP |
| REGEXP | Returns values that match a regular expression pattern |
| RLIKE | Synonym for REGEXP |
Conversion and translation functions¶
| Operator | Description |
|---|---|
| ASCII() | Return numeric value of left-most character |
| BIN() | Return a string representation of the argument |
| CHAR() | Return the character for each integer passed |
| HEX() | Return a hexadecimal representation of a decimal or string value |
| LOWER() | Return the argument in lowercase |
| LCASE() | Synonym for LOWER() |
| UCASE() | Synonym for UPPER() |
| UNHEX() | Convert each pair of hexadecimal digits to a character |
| UPPER() | Convert to uppercase |
Length and size functions¶
| Operator | Description |
|---|---|
| BIT_LENGTH() | Return length of argument in bits |
| CHAR_LENGTH() | Return number of characters in argument |
| LENGTH() | Return the length of a string in bytes |
| OCTET_LENGTH() | A synonym for LENGTH() |
Formatting and modification functions¶
| Operator | Description |
|---|---|
| CONCAT() | Returns a concatenated string |
| TRIM() | Remove leading and trailing spaces |
| LTRIM() | Remove leading spaces |
| RTRIM() | Remove trailing spaces |
Position functions¶
| Operator | Description |
|---|---|
| FIELD() | Return the index (position) of the first argument in the sequent arguments |
| FIND_IN_SET() | Return the index position of the first argument within the second argument |
| INSTR() | Return the index of the first occurrence of substring |
| LEFT() | Return the leftmost number of characters as specified |
| INSERT() | Insert a substring at the specified position up to the specified number of characters |
| LOCATE() | Return the position of the first occurrence of substring |
| POSITION() | A synonym for LOCATE() |
Other string functions¶
| Operator | Description |
|---|---|
| ELT() | Return string at index number |
| EXPORT_SET() | Return a string |
| FORMAT() | Return a number formatted to specified number of decimal places |
| LOAD_FILE() | Load the named file |
| LPAD() | Return the string argument, left-padded with the specified string |
| MAKE_SET() | Return a set of comma-separated strings that have the corresponding bit in bits set |
| MATCH | Perform full-text search |
| MID() | Return a substring starting from the specified position |
| ORD() | Return character code for leftmost character of the argument |
| QUOTE() | Escape the argument for use in an SQL statement |
| REPEAT() | Repeat a string the specified number of times |
| REPLACE() | Replace occurrences of a specified string |
| REVERSE() | Reverse the characters in a string |
| RIGHT() | Return the specified rightmost number of characters |
| RPAD() | Append string the specified number of times |
| SOUNDEX() | Return a soundex string |
| SUBSTR() | Return the substring as specified |
| SUBSTRING_INDEX() | Return a substring from a string before the specified number of occurrences of the delimiter |
| SUBSTRING() | Return the substring as specified |
