The UPDATE statement is used to change or modify the existing records in a database table.It is typically used in conjugation with the WHERE clause to apply the changes to only those records that matches specific criteria. Second, the SET clause specifies which column that you want to modify and the new values.

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The above query will update all the instances of CDRECORD in your column aet.

If IGNORE is provided, all errors encountered during the update are ignored.

If an update on a row would result in a violation of a primary key or unique index, the update on that row is not performed.

The UPDATE statement is used to update the records in a My SQL database table.

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.) With this change, such statements produce a warning in the log when using statement-based mode and are logged using the row-based format when using mode.

(Bug #11758262, Bug #50439) See Section 18.2.1.3, “Determination of Safe and Unsafe Statements in Binary Logging”, for more information.

You supply the value in each column’s assignment in the form of a literal value, an expression, or a subquery.

Third, you specify which rows will be updated using a condition in the WHERE clause.