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https://dev.mysql.com/doc/refman/9.7/en/information-schema-introduction.html
INFORMATION_SCHEMA provides access to database metadata, information about the MySQL server such as the name of a database or table, the data type of a column, or access privileges. Other terms that are sometimes used for this information are data ...
https://dev.mysql.com/doc/refman/9.7/en/numeric-type-attributes.html
MySQL supports an extension for optionally specifying the display width of integer data types in parentheses following the base keyword for the type. For example, INT(4) specifies an INT with a display width of four digits. This optional display ...
https://dev.mysql.com/doc/refman/9.7/en/performance-schema-error-summary-tables.html
The Performance Schema maintains summary tables for aggregating statistical information about server errors (and warnings). For a list of server errors, see Server Error Message Reference. Collection of error information is controlled by the error ...
https://dev.mysql.com/doc/refman/9.7/en/spatial-relation-functions-object-shapes.html
The OpenGIS specification defines the following functions to test the relationship between two geometry values g1 and g2, using precise object shapes. The return values 1 and 0 indicate true and false, respectively, except that distance functions ...
https://dev.mysql.com/doc/refman/9.7/en/x-plugin-options-system-variables.html
To control activation of X Plugin, use this option: --mysqlx[=value] Command-Line Format --mysqlx[=value] Type Enumeration Default Value ON Valid Values ONOFFFORCEFORCE_PLUS_PERMANENT This option controls how the server loads X Plugin at startup.
https://dev.mysql.com/doc/refman/9.7/en/all-subqueries.html
The expression is TRUE if table t2 contains (-5,0,+5) because 10 is greater than all three values in t2. The expression is FALSE if table t2 contains (12,6,NULL,-100) because there is a single value 12 in table t2 that is greater than 10. The ...
https://dev.mysql.com/doc/refman/9.7/en/creating-spatial-indexes.html
For InnoDB and MyISAM tables, MySQL can create spatial indexes using syntax similar to that for creating regular indexes, but using the SPATIAL keyword. For storage engines that support nonspatial indexing of spatial columns, the engine creates a ...
https://dev.mysql.com/doc/refman/9.7/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. Unless otherwise specified, functions in this section handle their geometry arguments as follows: If any argument is NULL or any ...
https://dev.mysql.com/doc/refman/9.7/en/information-schema-innodb-columns-table.html
For related usage information and examples, see Section 17.15.3, “InnoDB INFORMATION_SCHEMA Schema Object Tables”. The INNODB_COLUMNS table has these columns: TABLE_ID An identifier representing the table associated with the column; the same ...
https://dev.mysql.com/doc/refman/9.7/en/information-schema-statistics-table.html
The information_schema_stats_expiry system variable defines the period of time before cached table statistics expire. If there are no cached statistics or statistics have expired, statistics are retrieved from storage engines when querying table ...