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If you omit the WHERE clause, all records in the table will be updated!
The WHERE clause specifies which record(s) that should be updated.
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.
(This is because the order in which the rows are updated determines which rows are ignored.) Such statements produce a warning in the error log when using statement-based mode and are written to the binary log using the row-based format when using mode.
Its movie id is 18, we can use the script shown below to delete its row from the movies table.
Executing the above script deletes movies with IDs 20 and 21 from our movies table.
This can allow you to restore the database and view the data later on should it be required.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.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.
The Update command is used to modify rows in a table.