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https://dev.mysql.com/doc/refman/8.0/en/counting-rows.html
The use of COUNT() in conjunction with GROUP BY is useful for characterizing your data under various groupings. Counting the total number of animals you have is the same question as “How many rows are in the pet table?” because there is one ...
https://dev.mysql.com/doc/refman/8.0/en/rename-table.html
Regardless of the statement used, if the rename operation would move the table to a database located on a different file system, the success of the outcome is platform specific and depends on the underlying operating system calls used to move table ...You must have ALTER and DROP privileges for the original table, and CREATE and INSERT privileges for the new ...As of MySQL 8.0.13, you can rename tables locked with a LOCK TABLES statement, provided that they are locked with a ...
https://dev.mysql.com/doc/refman/8.0/en/index-btree-hash.html
Understanding the B-tree and hash data structures can help predict how different queries perform on different storage engines that use these data structures in their indexes, particularly for the MEMORY storage engine that lets you choose B-tree or ...B-Tree Index Characteristics Hash Index Characteristics B-Tree Index Characteristics A B-tree index can be used for column comparisons in expressions that use the =, >, >=, <, <=, or BETWEEN ...
https://dev.mysql.com/doc/refman/8.0/en/partitioning-limitations-partitioning-keys-unique-keys.html
The rule governing this relationship can be expressed as follows: All columns used in the partitioning expression for a partitioned table must be part of every unique key that the table may have. In other words, every unique key on the table must ...
https://dev.mysql.com/doc/refman/8.0/en/validate-password.html
STRONG policy adds the condition that password substrings of length 4 or longer must not match words in the dictionary file, if one has been specified. The validate_password component implements these capabilities: For SQL statements that assign a ... The validate_password component serves to improve security by requiring account passwords and enabling strength testing of potential ...
https://dev.mysql.com/doc/refman/8.0/en/cannot-find-table.html
Even for file systems that are not case-sensitive, such as on Windows, all references to a given table within a query must use the same lettercase. You can check which tables are in the default database with SHOW TABLES.
https://dev.mysql.com/doc/refman/8.0/en/administrative-connection-interface.html
These lines in the server my.cnf file enable the administrative interface on the loopback interface and configure it to use port number 33064 (that is, a port different from the default): [mysqld] admin_address=127.0.0.1 admin_port=33064 MySQL ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-programs-ndb-size-pl.html
This is a Perl script that can be used to estimate the amount of space that would be required by a MySQL database if it were converted to use the NDBCLUSTER storage engine. However, it does need to access the MySQL server on which the database to ...Unlike the other utilities discussed in this section, it does not require access to an NDB Cluster (in fact, there is no reason for it to do ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-shell-tutorial-javascript-download.html
You can either: Start MySQL Shell in SQL mode and import the file by issuing: mysqlsh -u root --sql --file /tmp/world_x-db/world_x.sql Enter password: **** Set MySQL Shell to SQL mode while it is running and source the schema file by issuing: \sql ... As part of this quick-start guide, an example schema is provided which is referred to as the world_x ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-shell-tutorial-python-download.html
You can either: Start MySQL Shell in SQL mode and import the file by issuing: mysqlsh -u root --sql --file /tmp/world_x-db/world_x.sql Enter password: **** Set MySQL Shell to SQL mode while it is running and source the schema file by issuing: \sql ... As part of this quick-start guide, an example schema is provided which is referred to as the world_x ...