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https://dev.mysql.com/doc/refman/5.7/en/spatial-operator-functions.html
ST_Buffer(g, d [, strategy1 [, strategy2 [, strategy3]]]) Returns a geometry that represents all points whose distance from the geometry value g is less than or equal to a distance of d, or NULL if any argument is NULL. If the argument is an empty ... OpenGIS proposes a number of functions that can produce ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-information-schema-fulltext_index-tables.html
When OPTIMIZE TABLE is run, the INNODB_FT_BEING_DELETED table is emptied, and DOC_ID values are removed from the INNODB_FT_DELETED table. INNODB_FT_BEING_DELETED: Provides a snapshot of the INNODB_FT_DELETED table; it is used only during an OPTIMIZE ...
https://dev.mysql.com/doc/refman/5.7/en/spatial-convenience-functions.html
ST_Distance_Sphere(g1, g2 [, radius]) Returns the mimimum spherical distance between two points and/or multipoints on a sphere, in meters, or NULL if any geometry argument is NULL or empty. For example, this polygon is geometrically invalid: ... The ...
https://dev.mysql.com/doc/refman/5.7/en/logical-operators.html
Table 12.5 Logical Operators Name Description AND, && Logical AND NOT, ! Negates value OR, || Logical OR XOR Logical XOR In SQL, all logical operators evaluate to TRUE, FALSE, or NULL (UNKNOWN). In MySQL, these are implemented as 1 (TRUE), 0 ...
https://dev.mysql.com/doc/refman/5.7/en/ansi-diff-foreign-keys.html
If ON UPDATE CASCADE or ON UPDATE SET NULL recurses to update the same table it has previously updated during the same cascade, it acts like RESTRICT. This means that you cannot use self-referential ON UPDATE CASCADE or ON UPDATE SET NULL operations. A self-referential ON DELETE SET NULL, on the other hand, is possible, as is a self-referential ON DELETE ...For example, if you define a RESTRICT type constraint, ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-optimization.html
row *************************** id: 1 select_type: SIMPLE table: VIEWS type: ALL possible_keys: NULL key: TABLE_SCHEMA,TABLE_NAME key_len: NULL ref: NULL rows: NULL Extra: Using where; Open_frm_only; Scanned 0 databases Use of constant database and ... Applications that monitor databases may make frequent use of INFORMATION_SCHEMA ...
https://dev.mysql.com/doc/refman/5.7/en/load-xml.html
Suppose that we have a table named person, created as shown here: USE test; CREATE TABLE person ( person_id INT NOT NULL PRIMARY KEY, fname VARCHAR(40) NULL, lname VARCHAR(40) NULL, created TIMESTAMP ); Suppose further that this table is initially ...The tagname in the optional ROWS IDENTIFIED BY clause must also be given as a literal string, and must be surrounded by angle brackets (< and ...
https://dev.mysql.com/doc/refman/5.7/en/myisamchk-table-info.html
Nullpos, Nullbit For columns that can be NULL, MyISAM stores NULL values as a flag in a byte. Depending on how many nullable columns there are, there can be one or more bytes used for this purpose. The Nullpos and Nullbit values, if nonempty, ... To ...
https://dev.mysql.com/doc/refman/5.7/en/outer-join-simplification.html
Instead, MySQL converts the query to a query with no outer join operation if the WHERE condition is null-rejected. (That is, it converts the outer join to an inner join.) A condition is said to be null-rejected for an outer join operation if it ...
https://dev.mysql.com/doc/refman/5.7/en/show-slave-status.html
In MySQL 5.7, this field is NULL (undefined or unknown) if the replica SQL thread is not running, or if the SQL thread has consumed all of the relay log and the replica I/O thread is not running. (In older versions of MySQL, this field was NULL if ... SHOW SLAVE STATUS [FOR CHANNEL channel] This statement provides status information on essential parameters of the replica ...