1. if we create a view using sub query then Insertion, Updation on that view can not be performed . 2. View should placed in parentheses

A sub-query is a query embedded in another query. The sub query can be embedded in another SELECT, INSERT, UPDATE, or DELETE statement, or inside another sub query.Properties:-The SELECT query of a subquery is always enclosed in parentheses View created by using a subquery cannot be updated. The ntext, text, and image data types cannot be used in the select list of sub queries If a table appears only in a subquery and not in the outer query, then columns from that table cannot be included in the output

A subquery must be enclosed in the parenthesis. A subquery must be put in the right hand of the comparison operator A subquery cannot contain a ORDER-BY clause. A query can contain more than one sub-queries.