Sql updating joined tables dating retuals germany in the 1990s

Sql updating joined tables

* 1 | TABLE ACCESS FULL| RES | 1 | 28 | 140 (2)| |-------------------------------------------------------------------------- Predicate Information (identified by operation id):--------------------------------------------------- 1 - filter("GUEST_ID"=101) select /* INDEX (res IN_RES_GUEST) */ res_id from res where guest_id = 101;--------------------------------------------------------------------------------------------| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |--------------------------------------------------------------------------------------------| 0 | SELECT STATEMENT | | 1 | 28 | 3 (0)|

Sure, you can drop the index and see the impact on the query, but that's easier said than done. You have to reinstate the index, and to do that, you will need to recreate.Of course, you could add a new column in the table called sale_category, and write a trigger to populate the column using the logic shown above—a fairly trivial exercise.But performance issues would arise due to context switching from and into the trigger code.Until it is completely recreated, no one can use it.The recreation of the index is also an expensive process; it takes up a lot of database resources you would rather put to better use.

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Obviously when she adds a not null column to a non-empty table, she has to also specify a default value, 'XX'.

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