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https://dev.mysql.com/doc/refman/8.0/en/counting-rows.html
See Section 14.19.1, “Aggregate Function Descriptions” for information about COUNT(expr) behavior and related optimizations. Counting the total number of animals you have is the same question as “How many rows are in the pet table?” because ...
https://dev.mysql.com/doc/refman/8.0/en/create-table-files.html
For an InnoDB table created in a file-per-table tablespace or general tablespace, table data and associated indexes are stored in a .ibd file in the database directory. When an InnoDB table is created in the system tablespace, table data and ...The ...
https://dev.mysql.com/doc/refman/8.0/en/csv-storage-engine.html
When you create a CSV table, the server creates a plain text data file having a name that begins with the table name and has a .CSV extension. If you examine the test.CSV file in the database directory created by executing the preceding statements, ... The CSV storage engine stores data in text files using comma-separated values ...
https://dev.mysql.com/doc/refman/8.0/en/cursor-restrictions.html
UPDATE WHERE CURRENT OF and DELETE WHERE CURRENT OF are not implemented, because updatable cursors are not supported. Initially, this is a MEMORY table, but is converted to a MyISAM table when its size exceeds the minimum value of the ...
https://dev.mysql.com/doc/refman/8.0/en/cursors.html
Cursors have these properties: Asensitive: The server may or may not make a copy of its result table Read only: Not updatable Nonscrollable: Can be traversed only in one direction and cannot skip rows Cursor declarations must appear before handler ...
https://dev.mysql.com/doc/refman/8.0/en/daemon-keyring-proxy-plugin.html
This is facilitated using the plugin named daemon_keyring_proxy_plugin that acts as a bridge between the plugin and component service APIs, and enables keyring plugins to continue to be used with no change to user-visible characteristics. MySQL ...
https://dev.mysql.com/doc/refman/8.0/en/declare-cursor.html
DECLARE cursor_name CURSOR FOR select_statement This statement declares a cursor and associates it with a SELECT statement that retrieves the rows to be traversed by the cursor. Cursor declarations must appear before handler declarations and after ...The number of columns retrieved by the SELECT statement must match the number of output variables specified in the FETCH ...
https://dev.mysql.com/doc/refman/8.0/en/declare.html
END compound statement and must be at its start, before any other statements. Variable and condition declarations must appear before cursor or handler declarations. The DECLARE statement is used to define various items local to a program: Local ...
https://dev.mysql.com/doc/refman/8.0/en/differences-from-ansi.html
We try to make MySQL Server follow the ANSI SQL standard and the ODBC SQL standard, but MySQL Server performs operations differently in some cases: There are several differences between the MySQL and standard SQL privilege systems. For example, in ...
https://dev.mysql.com/doc/refman/8.0/en/drop-function-loadable.html
(DROP FUNCTION is also used to drop stored functions; see Section 15.1.29, “DROP PROCEDURE and DROP FUNCTION Statements”.) DROP FUNCTION is the complement of CREATE FUNCTION. DROP FUNCTION also removes the function from the Performance Schema ...