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https://dev.mysql.com/doc/refman/8.4/en/data-type-defaults.html
Data type specifications can have explicit or implicit default values. A DEFAULT value clause in a data type specification explicitly indicates a default value for a column. Examples: CREATE TABLE t1 ( i INT DEFAULT -1, c VARCHAR(10) DEFAULT '', ...
https://dev.mysql.com/doc/refman/8.4/en/encryption-functions.html
If you want to store these results, use a column with a VARBINARY or BLOB binary string data type. This avoids potential problems with trailing space removal or character set conversion that would change data values, such as may occur if you use a ...
https://dev.mysql.com/doc/refman/8.4/en/entering-queries.html
Make sure that you are connected to the server, as discussed in the previous section. Doing so does not in itself select any database to work with, but that is okay. At this point, it is more important to find out a little about how to issue ...
https://dev.mysql.com/doc/refman/8.4/en/exists-and-not-exists-subqueries.html
If a subquery returns any rows at all, EXISTS subquery is TRUE, and NOT EXISTS subquery is FALSE. For example: SELECT column1 FROM t1 WHERE EXISTS (SELECT * FROM t2); Traditionally, an EXISTS subquery starts with SELECT *, but it could begin with ...
https://dev.mysql.com/doc/refman/8.4/en/fulltext-natural-language.html
By default or with the IN NATURAL LANGUAGE MODE modifier, the MATCH() function performs a natural language search for a string against a text collection. A collection is a set of one or more columns included in a FULLTEXT index. For each row in the ...
https://dev.mysql.com/doc/refman/8.4/en/fulltext-search.html
MATCH (col1,col2,...) AGAINST (expr [search_modifier]) search_modifier: { IN NATURAL LANGUAGE MODE | IN NATURAL LANGUAGE MODE WITH QUERY EXPANSION | IN BOOLEAN MODE | WITH QUERY EXPANSION } MySQL has support for full-text indexing and searching: A ...
https://dev.mysql.com/doc/refman/8.4/en/gis-class-geometry.html
It is a noninstantiable class but has a number of properties, described in the following list, that are common to all geometry values created from any of the Geometry subclasses. Geometry Properties A geometry value has the following properties: Its ...
https://dev.mysql.com/doc/refman/8.4/en/gis-linestring-property-functions.html
You can extract particular points of a LineString, count the number of points that it contains, or obtain its length. Unless otherwise specified, functions in this section handle their geometry arguments as follows: If any argument is NULL or any ...
https://dev.mysql.com/doc/refman/8.4/en/gis-polygon-property-functions.html
Functions in this section return properties of Polygon or MultiPolygon values. Unless otherwise specified, functions in this section handle their geometry arguments as follows: If any argument is NULL or any geometry argument is an empty geometry, ...
https://dev.mysql.com/doc/refman/8.4/en/identifier-mapping.html
There is a correspondence between database and table identifiers and names in the file system. For the basic structure, MySQL represents each database as a directory in the data directory, and depending upon the storage engine, each table may be ...