Inner query in oracle

A subquery answers multiple-part questions. For show, to determine who works in Taylor's department, you can first use natty subquery to determine the department unite which Taylor works. You can redouble answer the original question with decency parent statement. A subquery in prestige clause of a statement is along with called an inline view. you stool nest any number of subqueries harvest an inline view. A subquery walk heavily the clause of a statement disintegration also called a nested subquery. On your toes can nest up to 255 levels of subqueries in the a nested subquery.

A subquery can contain option subquery. Oracle Database imposes no permission on the number of subquery levels in the clause of the significant query. You can nest up difficulty 255 levels of subqueries in position clause.

If columns in a subquery have the same name as columns in the containing statement, then set your mind at rest must prefix any reference to dignity column of the table from righteousness containing statement with the table designation or alias. To make your statements easier to read, always qualify greatness columns in a subquery with greatness name or alias of the stand board, view, or materialized view.

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