What Is Select for Update in Mysql
A Select … for Update Reads the Latest Available Data, Setting Exclusive Locks on Each Row It Reads. Thus, It Sets the Same Locks a Searched Sql Update Would...
A SELECT … FOR UPDATE reads the latest available data, setting exclusive locks on each row it reads. Thus, it sets the same locks a searched SQL UPDATE would set on the rows.
What is a select for update?
The SELECT FOR UPDATE statement is used to order transactions by controlling concurrent access to one or more rows of a table. It works by locking the rows returned by a selection query, such that other transactions trying to access those rows are forced to wait for the transaction that locked the rows to finish.
What is the difference between select and update?
The UPDATE query is used to update existing records in a table. The SELECT query is used to select data from a database. The result is stored in a result table, called the result-set.
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