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https://dev.mysql.com/doc/refman/5.7/en/charset-metadata.html
This is also true of the contents of tables in INFORMATION_SCHEMA because those tables by definition contain information about database objects. Otherwise, neither the SHOW statements nor SELECT statements for tables in INFORMATION_SCHEMA would work ... Metadata is “the data about the data.” Anything that describes the database—as opposed to being the contents of the database—is ...
https://dev.mysql.com/doc/refman/5.7/en/charset-mysql.html
To display the available character sets, use the INFORMATION_SCHEMA CHARACTER_SETS table or the SHOW CHARACTER SET statement. To list the display collations for a character set, use the INFORMATION_SCHEMA COLLATIONS table or the SHOW COLLATION ...
https://dev.mysql.com/doc/refman/5.7/en/charset-repertoire.html
The repertoire of a character set is the collection of characters in the set. String expressions have a repertoire attribute, which can have two values: ASCII: The expression can contain only ASCII characters; that is, characters in the Unicode ...
https://dev.mysql.com/doc/refman/5.7/en/charset-unicode-utf16.html
The utf16 character set is the ucs2 character set with an extension that enables encoding of supplementary characters: For a BMP character, utf16 and ucs2 have identical storage characteristics: same code values, same encoding, same length. For a ...
https://dev.mysql.com/doc/refman/5.7/en/comparisons-using-subqueries.html
It finds all rows in table t1 containing a value that occurs twice in a given column: SELECT * FROM t1 AS t WHERE 2 = (SELECT COUNT(*) FROM t1 WHERE t1.id = t.id); For a comparison of the subquery to a scalar, the subquery must return a scalar. The ...
https://dev.mysql.com/doc/refman/5.7/en/create-function-loadable.html
CREATE FUNCTION requires the INSERT privilege for the mysql system database because it adds a row to the mysql.func system table to register the function. During the normal startup sequence, the server loads functions registered in the mysql.func ...
https://dev.mysql.com/doc/refman/5.7/en/diagnostics-area.html
CATALOG_NAME, SCHEMA_NAME, TABLE_NAME, COLUMN_NAME: Strings that indicate the catalog, schema, table, and column related to the condition. SQL statements produce diagnostic information that populates the diagnostics area. Standard SQL has a ...
https://dev.mysql.com/doc/refman/5.7/en/dynamic-system-variables.html
For a description of the privilege requirements for setting system variables, see Section 5.1.8.1, “System Variable Privileges” The following table lists all dynamic system variables applicable within mysqld. This differs from the ENUM data type ... Many server system variables are dynamic and can be set at ...
https://dev.mysql.com/doc/refman/5.7/en/entering-queries.html
At this point, it is more important to find out a little about how to issue queries than to jump right in creating tables, loading data into them, and retrieving data from them. Normally, column labels are the names of the columns you fetch from ...
https://dev.mysql.com/doc/refman/5.7/en/examples.html
Some of the examples use the table shop to hold the price of each article (item number) for certain traders (dealers). Here are examples of how to solve some common problems with MySQL. Supposing that each trader has a single fixed price per ...