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If you update a column that has been declared , an error occurs if strict SQL mode is enabled; otherwise, the column is set to the implicit default value for the column data type and the warning count is incremented.
The implicit default value is tables for which there are foreign key constraints, the My SQL optimizer might process tables in an order that differs from that of their parent/child relationship.
Before we go into more details discussion the DELETE command, let's insert some sample data into the movies table to work with.
INSERT INTO `movies` (`title`, `director`, `year_released`, `category_id`) VALUES ('The Great Dictator', 'Chalie Chaplie', 1920, 7); INSERT INTO `movies` (`title`, `director`, `category_id`) VALUES ('sample movie', 'Anonymous', 8); INSERT INTO movies (`title`, `director`, `year_released`, `category_id`) VALUES ('movie 3', 'John Brown', 1920, 8); Let's suppose that the Myflix video library no longer wishes to be renting out "The Great Dictator" to its members and they want it removed from the database.
It is therefore strongly recommended to make database backups before deleting any data from the database.
This can allow you to restore the database and view the data later on should it be required.
Only the partitions (or subpartitions) listed are checked for matches, and a row that is not in any of these partitions or subpartitions is not updated, whether it satisfies the clause, are flagged as unsafe for statement-based replication.
The DELETE command can delete more than one row from a table in a single query.PDF (US Ltr) - 46.7Mb PDF (A4) - 46.8Mb PDF (RPM) - 42.2Mb HTML Download (TGZ) - 10.8Mb HTML Download (Zip) - 10.8Mb HTML Download (RPM) - 9.3Mb Man Pages (TGZ) - 224.9Kb Man Pages (Zip) - 330.3Kb Info (Gzip) - 4.2Mb Info (Zip) - 4.2Mb My SQL Backup and Recovery My SQL Globalization My SQL Information Schema My SQL Installation Guide Security in My SQL Starting and Stopping My SQL My SQL and Linux/Unix My SQL and Windows My SQL and OS X My SQL and Solaris Building My SQL from Source My SQL Restrictions and Limitations My SQL Partitioning My SQL Secure Deployment Guide My SQL Tutorial My SQL Performance Schema My SQL Replication Using the My SQL Yum Repository option as part of a table reference.This option takes a list of one or more partitions or subpartitions (or both).(Bug #11758262, Bug #50439) See Section 22.214.171.124, “Determination of Safe and Unsafe Statements in Binary Logging”, for more information.If you access a column from the table to be updated in an expression, assignments are generally evaluated from left to right.