Oracle updating through a view korean american dating service

Posted by / 23-Sep-2019 17:36

Oracle updating through a view

A view derives its data from the tables on which it is based. Views can be based on actual tables or another view also.

Views are very powerful and handy since they can be treated just like any other table but do not occupy the space of a table.

The following sections explain how to create, replace, and drop views using SQL commands. To see the empno, ename, sal, deptno, department name and location we have to give a join query like this.

I want to know which one is better regardless of space consideration and assume this tables can use all those methods. We have a load of legacy code that uses ORA_ROWSCN as an optimistic locking field. )-digit field for the host variable, and we experience horrible problems when the SCN ticks past the size that this can accommo... In one of the SQL the where clause is a combination of Index Column and non-index columns, however the query is not using the index column and instead going for Full Table Scan. Hello, Is there a way to get all the keys that exist in a JSON column?You can use DML operations on a view if the view does not include Group by, Start with, Connect by, Distinct clauses or any subqueries and set operations(Union, union all, intersect and minus). Whatever DML operations you performed on a view they actually affect the base table of the view. You can Query, Insert, Update and delete from views, just as any other table.Views that access multiple tables can only modify one of the tables in the view.Views that use functions, specify DISTINCT, or utilize the GROUP BY clause may not be updated.

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On recompiling the dependent objects become invalid.

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