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https://dev.mysql.com/doc/refman/5.7/en/group-by-functional-dependence.html
The following discussion provides several examples of the ways in which MySQL detects functional dependencies. The examples use this notation: {X} -> {Y} Understand this as “X uniquely determines Y,” which also means that Y is functionally ...
https://dev.mysql.com/doc/refman/5.7/en/aggregate-functions.html
For information about a change in MySQL 8.0 that permits bit operations to take binary string type arguments (BINARY, VARBINARY, and the BLOB types), see Section 12.12, “Bit Functions and Operators”. GROUP_CONCAT(expr) This function returns a ...
https://dev.mysql.com/doc/refman/5.7/en/json.html
(For strings in the ascii or utf8 character sets, no conversion is needed because ascii and utf8 are subsets of utf8mb4.) As an alternative to writing JSON values using literal strings, functions exist for composing JSON values from component ...The ...JSON documents stored in JSON columns are converted to an internal format that permits quick read access to document ...
https://dev.mysql.com/doc/refman/5.7/en/charset-literal.html
The examples use SET NAMES (which changes character_set_connection, as discussed in Section 10.4, “Connection Character Sets and Collations”), and display the resulting strings using the HEX() function so that the exact string contents can be ...
https://dev.mysql.com/doc/refman/5.7/en/xml-functions.html
Table 12.16 XML Functions Name Description ExtractValue() Extract a value from an XML string using XPath notation UpdateXML() Return replaced XML fragment This section discusses XML and related functionality in MySQL. Two functions providing basic ...Note It is possible to obtain XML-formatted output from MySQL in the mysql and mysqldump clients by invoking them with the --xml ...
https://dev.mysql.com/doc/refman/5.7/en/cast-functions.html
Table 12.15 Cast Functions and Operators Name Description BINARY Cast a string to a binary string CAST() Cast a value as a certain type CONVERT() Cast a value as a certain type Cast functions and operators enable conversion of values from one data ...A common use for BINARY is to force a character string comparison to be done byte by byte using numeric byte values rather than character by ...
https://dev.mysql.com/doc/refman/5.7/en/server-loadable-functions.html
MySQL supports loadable functions, that is, functions that are not built in but can be loaded at runtime (either during startup or later) to extend server capabilities, or unloaded to remove capabilities. For a table describing the available ...
https://dev.mysql.com/doc/refman/5.7/en/enterprise-encryption-installation.html
MySQL Enterprise Encryption functions are located in a loadable function library file installed in the plugin directory (the directory named by the plugin_dir system variable). The function library base name is openssl_udf and the suffix is ...For ...
https://dev.mysql.com/doc/refman/5.7/en/replace-utility.html
The replace utility program changes strings in place in files or on the standard input. < file_name from represents a string to look for and to represents its replacement. Use the -- option to indicate where the string-replacement list ends and the ...Note The replace utility is deprecated as of MySQL 5.7.18 and is removed in MySQL ...
https://dev.mysql.com/doc/refman/5.7/en/optimize-character.html
For character and string columns, follow these guidelines: Use binary collation order for fast comparison and sort operations, when you do not need language-specific collation features. When comparing values from different columns, declare those ...