mysql string function 字串函數
| 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 |
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 hexadecimal representation of a decimal or string 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 |
LIKE | Simple pattern matching |
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 |
MATCH | Perform full-text search |
MID() | Return a substring starting from the specified position |
NOT LIKE | Negation of simple pattern matching |
NOT REGEXP | Negation of REGEXP |
OCTET_LENGTH() | A synonym for LENGTH() |
ORD() | Return character code for leftmost character of the argument |
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 |
RLIKE | Synonym for REGEXP |
RPAD() | Append string the specified number of times |
RTRIM() | Remove trailing spaces |
SOUNDEX() | Return a soundex string |
SOUNDS LIKE(v4.1.0) | Compare sounds |
SPACE() | Return a string of the specified number of spaces |
STRCMP() | Compare two strings |
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 |
TRIM() | Remove leading and trailing spaces |
UCASE() | Synonym for UPPER() |
UNHEX()(v4.1.2) | Convert each pair of hexadecimal digits to a character |
UPPER() | Convert to uppercase |
常用指令:
- 檢查及修復資料庫
myisamchk /path/*/*.MYI
myisamchk --extend-check /path/*/*.MYI
本文為原創文章, 為尊重著作權, 未經作者同意請勿任意轉載- 關鍵字 : Return(28), string(18), specified(14), number(11), argument(10), substring(7), position(5), characters(5), character(5), spaces(4), index(4), first(4), REGEXP(4), value(3), synonym(3), matching(3), Synonym(3), Remove(3), trailing(2), times(2)
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2012-06-01T12:51:00+0000
