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17 lut 2021 · SELECT FOR UPDATE lets you base an update on the existing values in the rows, because it ensures that no other user can change those values before you update them. You can also use SELECT FOR UPDATE to lock rows that you do not want to update, as in Example 9-6.
This Oracle tutorial explains how to use the Oracle / PLSQL SELECT FOR UPDATE statement with syntax and examples. The SELECT FOR UPDATE statement allows you to lock the records in the cursor result set.
Learn how to use the FOR UPDATE clause of the SELECT statement in an updatable cursor to lock rows before updating them in Oracle. See syntax, examples and error handling.
3 sty 2018 · Learn how to use SELECT FOR UPDATE clause in Oracle to lock rows before updating them and avoid concurrency conflicts. See examples, syntax, and tips for PL/SQL implementation.
1 maj 2012 · Oracle lets you update the results of a SELECT statement. UPDATE (<SELECT Statement>) SET <column_name> = <value>. WHERE <column_name> <condition> <value>; I suppose that this could be used for updating columns in one table based on the value of a matching row in another table.
The SELECT FOR UPDATE statement can be used to prevent other users from making changes to data that you are currently working on. This can be useful for maintaining the integrity of your data. For example, you could use SELECT FOR UPDATE to lock rows that you are updating in a transaction.
No one else can update, delete or select for update these rows until you commit or rollback. You can use this to avoid deadlock by running a select for update at the start of your transaction. For example, to avoid the deadlock described in the previous module, a run select for update at the start.
