Difference Between Simple and Complex View in SQL

Simple Vs. Complex View in SQL: Find the Difference Between Simple and Complex View in SQL

Both of these are types of views in SQL. There is a primary difference between Simple and Complex View in SQL. But before we discuss that, let us first know more about Views. The View in SQL refers to a logical virtual table that we can create from other tables (one or more than one). In other words, a View is a logical data subset in SQL from multiple tables. A user can easily restrict access to data using Views.

A typical View has no data (own data). It is more like a window that allows a user to view data from any table and alter it accordingly. We primarily use these for fetching columns from different tables at any given time. The BASE tables are the tables on which the data of the View is based.

Based on the tables that we involve in any View, we can distinguish it into two major types- Complex View and Simple View. A Simple View is capable of containing only a single base table. On the other hand, we can construct a Complex view on multiple base tables. The Complex Views, in particular, are capable of containing an order by clause, a group by clause, and join conditions.

Difference Between Simple and Complex View in SQL

Parameters

Simple View in SQL

Complex View in SQL

Meaning and Definition

The Simple View in SQL refers to the views whose creation involves only a single table. In simple words, this View consists of only a single base table in SQL.

The Complex View in SQL refers to the views whose creation involves more than just one table. In simple words, this View involves the projection of multiple tables in SQL.

Associations

Since this View has only a single table in context, one doesn’t need to apply major associations for a Single View in SQL.

This View, on the other hand, contains multiple tables in context. Thus, one needs to apply general associations in it. It includes an order by clause, group by clause, and join conditions.

Group Functions

Since the Simple View contains a single table- one cannot make use of any group functions such as Count (), MAX(), etc.

The Complex View, on the other hand, involves multiple tables. Thus, we can make use of various group functions in it.

Allowed Operations

One can easily perform DML operations in the case of a Simple View.

In the case of the Complex View, one cannot always perform the DML operations.

Alterations

Since we can perform DML operations, we can easily use UPDATE, DELETE, and INSERT in Simple View in SQL.

Since we cannot always perform DML operations, we cannot always apply UPDATE, DELETE, and INSERT in Complex View in SQL.

NULL Columns

You cannot always use the base table for including the NOT NULL columns.

One can always include the NOT NULL column in case of a Complex View in SQL.

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