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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. If the argument is an empty geometry collection, the return value is NULL. If the argument is NULL or an empty geometry, the return value is NULL. If the argument is NULL or an ... Functions in this section return properties of Polygon or MultiPolygon ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-programs-ndb-desc.html
ndb_desc provides a detailed description of one or more NDB tables. Usage ndb_desc -c connection_string tbl_name -d db_name [options] ndb_desc -c connection_string index_name -d db_name -t tbl_name Additional options that can be used with ndb_desc ...
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/json-modification-functions.html
All members of the second object which do not have a corresponding key in the first object, and whose value is not the JSON null literal. All members with a key that exists in both the first and the second object, and whose value in the second ...
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
If this mode is not enabled, division by zero inserts NULL and produces no warning. If this mode is enabled, division by zero inserts NULL and produces a warning. For INSERT IGNORE and UPDATE IGNORE, division by zero inserts NULL and produces a ...
https://dev.mysql.com/doc/refman/5.7/en/gis-linestring-property-functions.html
If the argument is NULL or an empty geometry, the return value is NULL. If the argument is NULL or an empty geometry, the return value is NULL. If the argument is NULL or an empty geometry, the return value is NULL. If the argument is NULL or an ...
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 ...
https://dev.mysql.com/doc/refman/5.7/en/mysqldump.html
It is always enabled and attempting to disable it (--skip-secure-auth, --secure-auth=0) produces an error. NULL, 'NULL', and Empty Values: For a column named column_name, the NULL value, an empty string, and the string value 'NULL' are distinguished ... The mysqldump client utility performs logical backups, producing a set of SQL statements that can be executed to reproduce the original database object definitions and table ...
https://dev.mysql.com/doc/refman/5.7/en/create-table-foreign-keys.html
SET NULL: Delete or update the row from the parent table and set the foreign key column or columns in the child table to NULL. Both ON DELETE SET NULL and ON UPDATE SET NULL clauses are supported. If you specify a SET NULL action, make sure that you ... MySQL supports foreign keys, which permit cross-referencing related data across tables, and foreign key constraints, which help keep the related data ...