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https://dev.mysql.com/doc/refman/8.0/en/timestamp-lookups.html
Temporal values are stored in TIMESTAMP columns as UTC values, and values inserted into and retrieved from TIMESTAMP columns are converted between the session time zone and UTC. (This is the same type of conversion performed by the CONVERT_TZ() ...
https://dev.mysql.com/doc/refman/8.0/en/truncate-table.html
Logically, TRUNCATE TABLE is similar to a DELETE statement that deletes all rows, or a sequence of DROP TABLE and CREATE TABLE statements. To achieve high performance, TRUNCATE TABLE bypasses the DML method of deleting data. Thus, it does not cause ...
https://dev.mysql.com/doc/refman/8.0/en/tuning-trace-purging.html
Thus, if a statement contains substatements (such as invoking stored procedures, stored functions, or triggers), the topmost statement and substatements each generate one trace, but at the end of execution, the trace for only the last substatement ...
https://dev.mysql.com/doc/refman/8.0/en/tutorial.html
This chapter provides a tutorial introduction to MySQL by showing how to use the mysql client program to create and use a simple database. mysql (sometimes referred to as the “terminal monitor” or just “monitor”) is an interactive program ...
https://dev.mysql.com/doc/refman/8.0/en/update.html
UPDATE is a DML statement that modifies rows in a table. An UPDATE statement can start with a WITH clause to define common table expressions accessible within the UPDATE. Single-table syntax: UPDATE [LOW_PRIORITY] [IGNORE] table_reference SET ...
https://dev.mysql.com/doc/refman/8.0/en/upgrade-troubleshooting.html
A schema mismatch in a MySQL 5.7 instance between the .frm file of a table and the InnoDB data dictionary can cause an upgrade to MySQL 8.0 to fail. To address this issue, dump and restore affected tables before attempting the upgrade again. If ...
https://dev.mysql.com/doc/refman/8.0/en/upgrading-what-is-upgraded.html
Installing a new version of MySQL may require upgrading these parts of the existing installation: The mysql system schema, which contains tables that store information required by the MySQL server as it runs (see Section 7.3, “The mysql System ...
https://dev.mysql.com/doc/refman/8.0/en/user-variables.html
You can store a value in a user-defined variable in one statement and refer to it later in another statement. This enables you to pass values from one statement to another. User variables are written as @var_name, where the variable name var_name ...
https://dev.mysql.com/doc/refman/8.0/en/using-encrypted-connections.html
Several configuration parameters are available to indicate whether to use encrypted connections, and to specify the appropriate certificate and key files. See Section 20.6.2, “Securing Group Communication Connections with Secure Socket Layer ...
https://dev.mysql.com/doc/refman/8.0/en/using-system-variables.html
The MySQL server maintains many system variables that configure its operation. Section 7.1.8, “Server System Variables”, describes the meaning of these variables. System variables can be set at server startup using options on the command line ...