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https://dev.mysql.com/doc/refman/9.7/en/functions.html
Expressions can be used at several points in SQL statements, such as in the ORDER BY or HAVING clauses of SELECT statements, in the WHERE clause of a SELECT, DELETE, or UPDATE statement, or in SET statements. Expressions can be written using values ...
https://dev.mysql.com/doc/refman/9.7/en/gis-class-geometrycollection.html
A GeomCollection is a geometry that is a collection of zero or more geometries of any class. GeomCollection and GeometryCollection are synonymous, with GeomCollection the preferred type name. All the elements in a geometry collection must be in the ...
https://dev.mysql.com/doc/refman/9.7/en/gis-class-multisurface.html
A MultiSurface is a geometry collection composed of surface elements. MultiSurface Assertions Surfaces within a MultiSurface have no interiors that intersect. Surfaces within a MultiSurface have boundaries that intersect at most at a finite number ...
https://dev.mysql.com/doc/refman/9.7/en/gis-format-conversion-functions.html
MySQL supports the functions listed in this section for converting geometry values from internal geometry format to WKT or WKB format, or for swapping the order of X and Y coordinates. There are also functions to convert a string from WKT or WKB ...
https://dev.mysql.com/doc/refman/9.7/en/gone-away.html
This section also covers the related Lost connection to server during query error. The most common reason for the MySQL server has gone away error is that the server timed out and closed the connection. In this case, you normally get one of the ...
https://dev.mysql.com/doc/refman/9.7/en/group-by-modifiers.html
The GROUP BY clause permits a WITH ROLLUP modifier that causes summary output to include extra rows that represent higher-level (that is, super-aggregate) summary operations. ROLLUP thus enables you to answer questions at multiple levels of ...
https://dev.mysql.com/doc/refman/9.7/en/group-replication-background.html
The most common way to create a fault-tolerant system is to resort to making components redundant, in other words the component can be removed and the system should continue to operate as expected. This creates a set of challenges that raise ...
https://dev.mysql.com/doc/refman/9.7/en/group-replication-change-primary.html
This section explains how to change which member of a single-primary group is the primary, using the group_replication_set_as_primary() function, which can be can be run on any member of the group. When this is done, the current primary becomes a ...
https://dev.mysql.com/doc/refman/9.7/en/group-replication-cloning.html
If you want to use remote cloning operations for distributed recovery in a group, you must set up existing members and joining members beforehand to support this function. If you do not want to use this function in a group, do not set it up, in ...
https://dev.mysql.com/doc/refman/9.7/en/group-replication-distributed-recovery.html
Whenever a member joins or rejoins a replication group, it must catch up with the transactions that were applied by the group members before it joined, or while it was away. The joining member begins by checking the relay log for its ...