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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 ...
https://dev.mysql.com/doc/refman/5.7/en/sys-metrics.html
This view summarizes MySQL server metrics to show variable names, values, types, and whether they are enabled. The metric type determines the source from which the name is taken: For global status variables: The VARIABLE_NAME column of the ...
https://dev.mysql.com/doc/refman/5.7/en/sys-ps-setup-save.html
This enables you to alter the configuration temporarily for debugging or other purposes, then restore it to the previous state by invoking the ps_setup_reload_saved() procedure. To prevent other simultaneous calls to save the configuration, ...
https://dev.mysql.com/doc/refman/5.7/en/sys-schema-tables-with-full-table-scans.html
These views display which tables are being accessed with full table scans. The schema_tables_with_full_table_scans and x$schema_tables_with_full_table_scans views have these columns: object_schema The schema name. rows_full_scanned The total number ...
https://dev.mysql.com/doc/refman/5.7/en/timestamp-initialization.html
TIMESTAMP and DATETIME columns can be automatically initializated and updated to the current date and time (that is, the current timestamp). For any TIMESTAMP or DATETIME column in a table, you can assign the current timestamp as the default value, ...
https://dev.mysql.com/doc/refman/5.7/en/version-tokens-installation.html
To avoid this overhead, do not install it unless you plan to use it. This section describes how to install or uninstall Version Tokens, which is implemented in a plugin library file containing a plugin and loadable functions. For general information ...
https://dev.mysql.com/doc/refman/5.7/en/windows-testing.html
In this case, start mysqld with the skip_name_resolve system variable enabled and use only localhost and IP addresses in the Host column of the MySQL grant tables. (Be sure that an account exists that specifies an IP address or you may not be able ...
https://dev.mysql.com/doc/refman/5.7/en/x-plugin-encrypted-connections.html
This section explains how to configure X Plugin to use encrypted connections. To enable configuring support for encrypted connections, X Plugin has mysqlx_ssl_xxx system variables, which can have different values from the ssl_xxx system variables ...
https://dev.mysql.com/doc/refman/5.7/en/my-print-defaults.html
my_print_defaults displays the options that are present in option groups of option files. The output indicates what options are used by programs that read the specified option groups. For example, the mysqlcheck program reads the [mysqlcheck] and ...--defaults-extra-file=file_name, --extra-file=file_name, -e file_name Read this option file after the global option file but (on Unix) before the user option ...
https://dev.mysql.com/doc/refman/5.7/en/derived-tables.html
This does not work: SELECT AVG(SUM(column1)) FROM t1 GROUP BY column1; However, this query provides the desired information: SELECT AVG(sum_column1) FROM (SELECT SUM(column1) AS sum_column1 FROM t1 GROUP BY column1) AS t1; Notice that the column ...