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https://dev.mysql.com/doc/refman/9.7/en/problems-with-null.html
The concept of the NULL value is a common source of confusion for newcomers to SQL, who often think that NULL is the same thing as an empty string ''. For example, the following statements are completely different: mysql> INSERT INTO my_table ...
https://dev.mysql.com/doc/refman/9.7/en/spatial-geohash-functions.html
Geohash is a system for encoding latitude and longitude coordinates of arbitrary precision into a text string. Geohash values are strings that contain only characters chosen from "0123456789bcdefghjkmnpqrstuvwxyz". The functions in this section ...
https://dev.mysql.com/doc/refman/9.7/en/spatial-geojson-functions.html
This section describes functions for converting between GeoJSON documents and spatial values. Feature and FeatureCollection objects are not supported, except that geometry objects are extracted from them. MySQL also supports a native JSON data type ...
https://dev.mysql.com/doc/refman/9.7/en/spatial-operator-functions.html
OpenGIS proposes a number of functions that can produce geometries. These functions support all argument type combinations except those that are inapplicable according to the Open Geospatial Consortium specification. MySQL also implements certain ...
https://dev.mysql.com/doc/refman/9.7/en/spatial-relation-functions-mbr.html
MySQL provides several MySQL-specific functions that test the relationship between minimum bounding rectangles (MBRs) of two geometries g1 and g2. The return values 1 and 0 indicate true and false, respectively. The MBR (also known as the bounding ...
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/sql-mode.html
The MySQL server can operate in different SQL modes, and can apply these modes differently for different clients, depending on the value of the sql_mode system variable. DBAs can set the global SQL mode to match site server operating requirements, ...
https://dev.mysql.com/doc/refman/9.7/en/srjsapi-mysql.html
The following SQL built-in functions can be called directly from the mysql namespace. These are described in the following list, along with their analogous SQL functions: rand() (MySQL RAND()): Returns a random floating-point value v in the range 0 ...
https://dev.mysql.com/doc/refman/9.7/en/srjsapi-routines.html
Two functions, listed here, provide JavaScript Function objects reflecting MySQL stored routines: getFunction(): Get a Function instance given the name of a stored function. getProcedure(): Get a Function instance given the name of a stored ...
https://dev.mysql.com/doc/refman/9.7/en/user-variables.html
You can store a value in a user-defined variable in one statement and refer to it later in another statement. This enables you to pass values from one statement to another. User variables are written as @var_name, where the variable name var_name ...