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https://dev.mysql.com/doc/refman/5.7/en/column-indexes.html
The maximum number of indexes per table and the maximum index length is defined per storage engine. If a search term exceeds the index prefix length, the index is used to exclude non-matching rows, and the remaining rows are examined for possible ...
https://dev.mysql.com/doc/refman/5.7/en/sorting-rows.html
You may have noticed in the preceding examples that the result rows are displayed in no particular order. It is often easier to examine query output when the rows are sorted in some meaningful way. This means that the order is undefined for columns ...
https://dev.mysql.com/doc/refman/5.7/en/version-tokens.html
An SQL statement sent by the application to a server not in the required state produces an error. MySQL includes Version Tokens, a feature that enables creation of and synchronization around server tokens that applications can use to prevent ...
https://dev.mysql.com/doc/refman/5.7/en/rewriting-subqueries.html
Sometimes there are other ways to test membership in a set of values than by using a subquery. MySQL Server supports multiple-table DELETE statements that can be used to efficiently delete rows based on information from one table or even from many ...Also, on some occasions, it is not only possible to rewrite a query without a subquery, but it can be more efficient to make use of some of these techniques rather than to use ...
https://dev.mysql.com/doc/refman/5.7/en/tutorial.html
mysql (sometimes referred to as the “terminal monitor” or just “monitor”) is an interactive program that enables you to connect to a MySQL server, run queries, and view the results. mysql may also be used in batch mode: you place your ...
https://dev.mysql.com/doc/refman/5.7/en/my-print-defaults.html
my_print_defaults displays the options that are present in option groups of option files. The output indicates what options are used by programs that read the specified option groups. For example, the mysqlcheck program reads the [mysqlcheck] and ...
https://dev.mysql.com/doc/refman/5.7/en/mysql.html
This forces mysql to retrieve results from the server a row at a time rather than retrieving the entire result set and buffering it in memory before displaying it. You can execute SQL statements in a script file (batch file) like this: mysql db_name ... mysql is a simple SQL shell with input line editing ...
https://dev.mysql.com/doc/refman/5.7/en/sys-schema-usage.html
Most of these views come in pairs, such that one member of the pair has the same name as the other member, plus a x$ prefix. The view with the x$ prefix that displays the same values in raw form is intended more for use with other tools that perform ...
https://dev.mysql.com/doc/refman/5.7/en/sys-table-exists.html
Tests whether a given table exists as a regular table, a TEMPORARY table, or a view. If both a temporary and a permanent table exist with the given name, TEMPORARY is returned. Parameters in_db VARCHAR(64): The name of the database in which to ...
https://dev.mysql.com/doc/refman/5.7/en/transport-protocols.html
For programs that use the MySQL client library (for example, mysql and mysqldump), MySQL supports connections to the server based on several transport protocols: TCP/IP, Unix socket file, named pipe, and shared memory. This section describes how to ...