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https://dev.mysql.com/doc/refman/5.7/en/spatial-type-overview.html
MySQL has spatial data types that correspond to OpenGIS classes. The basis for these types is described in Section 11.4.2, “The OpenGIS Geometry Model”. Some spatial data types hold single geometry values: GEOMETRY POINT LINESTRING POLYGON ...
https://dev.mysql.com/doc/refman/5.7/en/stored-routines-syntax.html
Stored routines are created with the CREATE PROCEDURE and CREATE FUNCTION statements (see Section 13.1.16, “CREATE PROCEDURE and CREATE FUNCTION Statements”). A stored routine is either a procedure or a function. A procedure is invoked using a ...
https://dev.mysql.com/doc/refman/5.7/en/sys-table-exists.html
Tests whether a given table exists as a regular table, a TEMPORARY table, or a view. If both a temporary and a permanent table exist with the given name, TEMPORARY is returned. Parameters in_db VARCHAR(64): The name of the database in which to ...
https://dev.mysql.com/doc/refman/5.7/en/view-algorithms.html
The optional ALGORITHM clause for CREATE VIEW or ALTER VIEW is a MySQL extension to standard SQL. A reason to specify TEMPTABLE explicitly is that locks can be released on underlying tables after the temporary table has been created and before it ...For MERGE, the text of a statement that refers to the view and the view definition are merged such that parts of the view definition replace corresponding parts of the ...
https://dev.mysql.com/doc/refman/5.7/en/ansi-diff-comments.html
In this case, the generated statement looks like this: UPDATE account SET balance=balance--1 WHERE account_id=5752; balance--1 is valid standard SQL, but -- is interpreted as the start of a comment, and part of the expression is discarded. The ...
https://dev.mysql.com/doc/refman/5.7/en/condition-filtering.html
Condition filtering enables the optimizer to use other relevant conditions in the WHERE clause not taken into account by the access method, and thus improve its prefix row count estimates. It was not already taken into account by the access method.
https://dev.mysql.com/doc/refman/5.7/en/unix-signal-response.html
On Unix and Unix-like systems, a process can be the recipient of signals sent to it by the root system account or the system account that owns the process. This is like executing a SHUTDOWN statement without having to connect to the server (which ...Some command interpreters associate certain key sequences with signals, such as Control+C to send a SIGINT ...
https://dev.mysql.com/doc/refman/5.7/en/index-extensions.html
Consider this table definition: CREATE TABLE t1 ( i1 INT NOT NULL DEFAULT 0, i2 INT NOT NULL DEFAULT 0, d DATE DEFAULT NULL, PRIMARY KEY (i1, i2), INDEX k_d (d) ) ENGINE = InnoDB; This table defines the primary key on columns (i1, i2). The optimizer ... InnoDB automatically extends each secondary index by appending the primary key columns to ...
https://dev.mysql.com/doc/refman/5.7/en/starting-server-troubleshooting.html
You can create a my.cnf file and specify startup options for the engines that you plan to use. For example, if the data directory is /usr/local/mysql/var, use this command: $> ls -la /usr/local/mysql/var If the data directory or its files or ...
https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html
mysql> SELECT TO_DAYS(950501); -> 728779 mysql> SELECT TO_DAYS('2007-10-07'); -> 733321 TO_DAYS() is not intended for use with values that precede the advent of the Gregorian calendar (1582), because it does not take into account the days that were ... This section describes the functions that can be used to manipulate temporal ...