MySQL字符串函數
MySQL字符串函數用法實例代碼教學
| Name | Description |
|---|---|
| ASCII() | Return numeric value of left-most character |
| BIN() | Return a string representation of the argument |
| BIT_LENGTH() | Return length of argument in bits |
| CHAR_LENGTH() | Return number of characters in argument |
| CHAR() | Return the character for each integer passed |
| CHARACTER_LENGTH() | A synonym for CHAR_LENGTH() |
| CONCAT_WS() | Return concatenate with separator |
| CONCAT() | Return concatenated string |
| CONV() | Convert numbers between different number bases |
| ELT() | Return string at index number |
| EXPORT_SET() | Return a string such that for every bit set in the value bits, you get an on string and for every unset bit, you get an off string |
| FIELD() | Return the index (position) of the first argument in the subsequent arguments |
| FIND_IN_SET() | Return the index position of the first argument within the second argument |
| FORMAT() | Return a number formatted to specified number of decimal places |
| HEX() | Return a string representation of a hex value |
| INSERT() | Insert a substring at the specified position up to the specified number of characters |
| INSTR() | Return the index of the first occurrence of substring |
| LCASE() | Synonym for LOWER() |
| LEFT() | Return the leftmost number of characters as specified |
| LENGTH() | Return the length of a string in bytes |
| LOAD_FILE() | Load the named file |
| LOCATE() | Return the position of the first occurrence of substring |
| LOWER() | Return the argument in lowercase |
| LPAD() | Return the string argument, left-padded with the specified string |
| LTRIM() | Remove leading spaces |
| MAKE_SET() | Return a set of comma-separated strings that have the corresponding bit in bits set |
| MID() | Return a substring starting from the specified position |
| OCT() | Return a string representation of the octal argument |
| OCTET_LENGTH() | A synonym for LENGTH() |
| ORD() | If the leftmost character of the argument is a multi-byte character, returns the code for that character |
| POSITION() | A synonym for LOCATE() |
| QUOTE() | Escape the argument for use in an SQL statement |
| REGEXP | Pattern matching using regular expressions |
| 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 |
| RTRIM() | Remove trailing spaces |
| SOUNDEX() | Return a soundex string |
| SOUNDS LIKE | Compare sounds |
| SPACE() | Return a string of the specified number of spaces |
| STRCMP() | Compare two strings |
| SUBSTRING_INDEX() | Return a substring from a string before the specified number of occurrences of the delimiter |
| SUBSTRING(), SUBSTR() | Return the substring as specified |
| TRIM() | Remove leading and trailing spaces |
| UCASE() | Synonym for UPPER() |
| UNHEX() | Convert each pair of hexadecimal digits to a character |
| UPPER() | Convert to uppercase |
