Oracle multiple processes updating same table Free adult cams usa

In the past, we'd have accomplished this by a combination of INSERT and UPDATE statements, but starting with Oracle we've now got the Oracle MERGE command which does this in one step.What's more, we can wrap up the whole transformation process into this one Oracle MERGE command, referencing the external table and the table function in the one command as the source for the MERGED Oracle data.You can specify the DELETE where_clause to clean up data in a table while the MERGE statement is populating or updating it.The only rows affected by the delete clause of the MERGE statement are those rows in the target table that are updated by the merge operation.

MERGE is what is known as a deterministic statement.merge_insert_clause To specify the values used for insert operations the merge_insert_clause is used.The MERGE statement uses the merge_insert_clause when the condition of the ON clause is false.As with any normal update, when the update clause is executed, all update triggers defined on the target table are fired.where_clause - You must specify the where_clause if you want Oracle to execute the update operation only if the specified condition is true.

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