![]() ![]() When you query column C after the RENAME operation, no errors are reported. In this case, no errors are reported, and the system maps column C to the third column of the base table. (usernamebob) IntegrityError: duplicate key value violates unique constraint authuserpkey DETAIL: Key (id)(1) already exists. In AnalyticDB for MySQL of versions earlier than 3.1.9.0, the system only checks whether the number of columns in a view is the same as the number of columns that are referenced by the asterisk ( *). er > backupServer.sql - Dump all the tables of a. The system reports an error in the parsing stage regardless of whether column C is used for query. You can issue a SHOW CREATE DATABASE databaseName to display the full. ![]() ![]() Stage 2: Assuming that you can connect, the server checks each statement you issue to. If an account only needs access to portions of a table, consider creating a view that limits access to that portion of the data and assigning the account access. This is an expected result because the parsing stage that contains SQL syntax check and authentication is earlier than the optimization stage in which columns are removed. MySQL access control involves two stages when you run a client program that connects to the server: Stage 1: The server accepts or rejects the connection based on your identity and whether you can verify your identity by supplying the correct password. For example, when you rename column C as column D, the system fails to find column C when it references column A, column B, and column C, and then reports an error. The view query itself is saved in the database, but it is not actually run until it is. The compatibility of AnalyticDB for MySQL clusters of V3.1.9.0 or later with MySQL behavior may cause special impacts. CREATE OR REPLACE VIEW AS SELECT .But, unlike tables, views do not actually contain any data. Creating Views to Simplify Table Access A view is a virtual table whose definition is stored in the database. Note For more information about how to view the minor engine version of a cluster, see How can I view the version of an AnalyticDB for MySQL cluster? To update the minor engine version of a cluster, contact technical support. If you are creating a user specifically for a given table you will have to create the user first (with no global privileges) and then go back and edit that user. SQL CREATE VIEW Statement In this tutorial you will learn how to create, update, and delete a view using SQL. ![]()
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