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https://dev.mysql.com/doc/refman/5.7/en/using-innodb-tables.html
row *************************** Name: t1 Engine: InnoDB Version: 10 Row_format: Dynamic Rows: 0 Avg_row_length: 0 Data_length: 16384 Max_data_length: 0 Index_length: 0 Data_free: 0 Auto_increment: NULL Create_time: 2021-02-18 12:18:28 Update_time: ... InnoDB tables are created using the CREATE TABLE statement; for example: CREATE TABLE t1 (a INT, b CHAR (20), PRIMARY KEY (a)) ENGINE=InnoDB; The ENGINE=InnoDB clause is not required when InnoDB is defined as the default storage engine, which it is by ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-programs-ndb-blob-tool.html
--connect-string Command-Line Format --connect-string=connection_string Type String Default Value [none] Same as --ndb-connectstring. --database=db_name, -d Command-Line Format --database=name Type String Default Value [none] Specify the database to ... This tool can be used to check for and remove orphaned BLOB column parts from NDB tables, as well as to generate a file listing any orphaned ...
https://dev.mysql.com/doc/refman/5.7/en/federated-create-server.html
If you are creating a number of FEDERATED tables on the same server, or if you want to simplify the process of creating FEDERATED tables, you can use the CREATE SERVER statement to define the server connection parameters, just as you would with the ...If you specify only the connection name without a table name, the table name of the local table is used ...
https://dev.mysql.com/doc/refman/5.7/en/using-date.html
MySQL also permits a “relaxed” string format when updating and in a WHERE clause that compares a date to a DATE, DATETIME, or TIMESTAMP column. MySQL can also convert a string containing no separators (such as '20040815'), provided it makes ...
https://dev.mysql.com/doc/refman/5.7/en/pam-pluggable-authentication.html
Proxy user support: PAM authentication can return to MySQL a user name different from the external user name passed by the client program, based on the PAM groups the external user is a member of and the authentication string provided. The PAM ...
https://dev.mysql.com/doc/refman/5.7/en/federated-create-connection.html
To use the first method, you must specify the CONNECTION string after the engine type in a CREATE TABLE statement. For example: CREATE TABLE federated_table ( id INT(20) NOT NULL AUTO_INCREMENT, name VARCHAR(32) NOT NULL DEFAULT '', other INT(20) ...In the example, the remote table is on the server remote_host, using port ...
https://dev.mysql.com/doc/refman/5.7/en/set.html
A SET is a string object that can have zero or more values, each of which must be chosen from a list of permitted values specified when the table is created. For example, a column specified as SET('one', 'two') NOT NULL can have any of these ...SET ...
https://dev.mysql.com/doc/refman/5.7/en/user-variables.html
User variables can be assigned a value from a limited set of data types: integer, decimal, floating-point, binary or nonbinary string, or NULL value. If you refer to a variable that has not been initialized, it has a value of NULL and a type of ...A ... You can store a value in a user-defined variable in one statement and refer to it later in another ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-parameters-table.html
The PARAMETER_NAME and PARAMETER_MODE values are NULL because the return value has no name and the mode does not apply. The PARAMETERS table provides information about parameters for stored routines (stored procedures and stored functions), and ...
https://dev.mysql.com/doc/refman/5.7/en/order-by-optimization.html
If a query includes GROUP BY but you want to avoid the overhead of sorting the result, you can suppress sorting by specifying ORDER BY NULL. For example: INSERT INTO foo SELECT a, COUNT(*) FROM bar GROUP BY a ORDER BY NULL; The optimizer may still ... This section describes when MySQL can use an index to satisfy an ORDER BY clause, the filesort operation used when an index cannot be used, and execution plan information available from the optimizer about ORDER ...