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https://dev.mysql.com/doc/refman/8.0/en/precision-math-examples.html
Consider these statements: mysql> CREATE TABLE t (i INT, d DECIMAL, f FLOAT); mysql> INSERT INTO t VALUES(1,1,1); mysql> CREATE TABLE y SELECT AVG(i), AVG(d), AVG(f) FROM t; The result is a double only for the floating-point argument. This section ...
https://dev.mysql.com/doc/refman/8.0/en/replication-solutions-partitioning.html
Figure 19.2 Replicating Databases to Separate Replicas You can achieve this separation by configuring the source and replicas as normal, and then limiting the binary log statements that each replica processes by using the --replicate-wild-do-table ... There may be situations where you have a single source server and want to replicate different databases to different ...
https://dev.mysql.com/doc/refman/8.0/en/replication-solutions-unexpected-replica-halt.html
From MySQL 8.0, this repository is created by default as an InnoDB table named mysql.slave_relay_log_info. DML transactions and also atomic DDL update the replication positions in the replica's applier metadata repository in the ... In order for ...
https://dev.mysql.com/doc/refman/8.0/en/secure-client-programming.html
If an application generates a query such as SELECT * FROM table WHERE ID=234 when a user enters the value 234, the user can enter the value 234 OR 1=1 to cause the application to generate the query SELECT * FROM table WHERE ID=234 OR 1=1. As a ...
https://dev.mysql.com/doc/refman/8.0/en/show.html
SHOW has many forms that provide information about databases, tables, columns, or status information about the server. In addition, you can work in SQL with results from queries on tables in the INFORMATION_SCHEMA database, which you cannot easily ...The pattern is useful for restricting statement output to matching ...
https://dev.mysql.com/doc/refman/8.0/en/subquery-errors.html
In MySQL 8.0.19 and later, all of the errors described in this section also apply when using TABLE in subqueries. Incorrect number of rows from subquery: ERROR 1242 (ER_SUBSELECT_NO_1_ROW) SQLSTATE = 21000 Message = "Subquery returns more than 1 ...
https://dev.mysql.com/doc/refman/8.0/en/create-procedure.html
By default, MySQL automatically grants the ALTER ROUTINE and EXECUTE privileges to the routine creator. The following example shows a simple stored procedure that, given a country code, counts the number of cities for that country that appear in the ...By default, a stored routine is associated with the default ...
https://dev.mysql.com/doc/refman/8.0/en/socket-pluggable-authentication.html
Alternatively, to load the plugin at runtime, use this statement: INSTALL PLUGIN auth_socket SONAME 'auth_socket.so'; INSTALL PLUGIN loads the plugin immediately, and also registers it in the mysql.plugins system table to cause the server to load it ...To verify plugin installation, examine the Information Schema PLUGINS table or use the SHOW PLUGINS statement (see Section 7.6.2, “Obtaining Server Plugin ...
https://dev.mysql.com/doc/refman/8.0/en/linux-installation-rpm.html
A standard installation of MySQL using the RPM packages result in files and resources created under the system directories, shown in the following table. The recommended way to install MySQL on RPM-based Linux distributions is by using the RPM ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-limitations-unsupported.html
If a prefix is used as part of an index specification in a statement such as CREATE TABLE, ALTER TABLE, or CREATE INDEX, the prefix is not created by NDB. A number of features supported by other storage engines are not supported for NDB tables. A ...Trying to use any of these features in NDB Cluster does not cause errors in or of itself; however, errors may occur in applications that expects the features to be supported or ...