![]() The "s" in TiDB corresponds to "n" in MySQL. Value options in TiDB are "c", "i", "m", and "s", and value options in MySQL are "c", "i", "m", "n", and "u". The value options of match_type between TiDB and MySQL are: To learn the syntax differences between the two libraries, you can refer to the ICU documentation and RE2 Syntax. MySQL implements regular expression using International Components for Unicode (ICU), and TiDB uses RE2. The following sections describe the regular expression compatibility with MySQL. Regular expression compatibility with MySQL Return the weight string for the input string Return a string containing hex representation of a number It does not treat empty strings as NULL as Oracle does. Replace all occurrences of characters by other characters in a string. Return the argument converted to a base-64 string Return a substring from a string before the specified number of occurrences of the delimiter Return a string of the specified number of spaces Return the specified rightmost number of charactersĪppend string the specified number of times Replace occurrences of a specified string Repeat a string the specified number of times For more details, see Regular expression compatibility with MySQL) Return the substring that matches the regular expression (Partly compatible with MySQL. Replace substrings that match the regular expression (Partly compatible with MySQL. Whether the string matches the regular expression (Partly compatible with MySQL. Return the starting index of the substring that matches the regular expression (Partly compatible with MySQL. Pattern matching using regular expressions Return character code for leftmost character of the argumentĮscape the argument for use in an SQL statement Return a string containing octal representation of a number Return a substring starting from the specified position ![]() Return a set of comma-separated strings that have the corresponding bit in bits set Return the string argument, left-padded with the specified string Return the position of the first occurrence of substring Return the leftmost number of characters as specified Return the index of the first occurrence of substring Insert a substring at the specified position up to the specified number of characters Return a hexadecimal representation of a decimal or string value Return a number formatted to specified number of decimal placesĭecode to a base-64 string and return result Return the index position of the first argument within the second argument Return the index (position) of the first argument in the subsequent arguments 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 Return the character for each integer passed Return a string containing binary representation of a number ![]() ![]() Return numeric value of left-most character TiDB supports most of the string functions available in MySQL 5.7, some of the string functions available in MySQL 8.0, and some of the functions available in Oracle 21.įor comparisons between functions and syntax of Oracle and TiDB, see Comparisons between Functions and Syntax of Oracle and TiDB. It is recommended that you use the latest LTS version of the TiDB database. ImportantYou are viewing the archived documentation of TiDB, which no longer receives updates. ![]()
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