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https://dev.mysql.com/doc/refman/5.7/en/string-functions-charset.html
MySQL has many operators and functions that return a string. This section answers the question: What is the character set and collation of such a string? For simple functions that take string input and return a string result as output, the output's ...If explicit COLLATE Y and COLLATE Z occur, raise an ...
https://dev.mysql.com/doc/refman/5.7/en/encryption-functions.html
Note If you are using a KDF, you must specify an initialization vector or a null string for this argument, in order to access the later arguments to define the KDF. When you specify kdf_name, you must specify init_vector, using either a valid ...If ...N is 16 for an MD5() value and 20 for a SHA1() ...
https://dev.mysql.com/doc/refman/5.7/en/gis-polygon-property-functions.html
If the argument is NULL or an empty geometry, the return value is NULL. Such components are extracted and made into a single MultiPolygon, MultiLineString, or MultiPoint for centroid computation. If the argument is an empty geometry collection, the ... Functions in this section return properties of Polygon or MultiPolygon ...
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 ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-information-schema-metrics-table.html
Because no DML operations have been performed, the counter values are zero or NULL. row *************************** NAME: dml_inserts SUBSYSTEM: dml COUNT: 0 MAX_COUNT: 0 MIN_COUNT: NULL AVG_COUNT: 0 COUNT_RESET: 0 MAX_COUNT_RESET: 0 ... The ...
https://dev.mysql.com/doc/refman/5.7/en/sql-mode.html
To clear the SQL mode explicitly, set it to an empty string using --sql-mode="" on the command line, or sql-mode="" in an option file. ANSI_QUOTES Treat " as an identifier quote character (like the ` quote character) and not as a string quote ...
https://dev.mysql.com/doc/refman/5.7/en/replication-gtids-failover.html
There are a number of techniques when using MySQL Replication with Global Transaction Identifiers (GTIDs) for provisioning a new replica which can then be used for scaleout, being promoted to source as necessary for failover. Each identifier ...
https://dev.mysql.com/doc/refman/5.7/en/gis-linestring-property-functions.html
You can extract particular points of a LineString, count the number of points that it contains, or obtain its length. (There is an existing SQL function Length() that calculates the length of string values.) GLength() is deprecated; expect it to be ...EndPoint() is deprecated; expect it to be removed in a future MySQL ...
https://dev.mysql.com/doc/refman/5.7/en/group-by-modifiers.html
These rows have the country and products columns set to NULL. This row has the year, country, and products columns set to NULL. The NULL indicators in each super-aggregate row are produced when the row is sent to the client. For any column in the ...