Answer / ashokram s

Using view you can restrict the data and thus granting privilege on the view instead of base table can ensure security that all data cant be accessible by a particular user

Answer / madhusudhan.madireddy

limit access and view to required fields only

Answer / santosh kumar

Hi,

Advantages of views:

1. View the data without storing the data into the object.

2. Restict the view of a table i.e. can hide some of columns in the tables.

3. Join two or more tables and show it as one object to user.

4. Restict the access of a table so that nobody can insert the rows into the table.

Disadvatages:

1. Can not use DML operations on this.

2. When table is dropped view becomes inactive.. it depends on the table objects.

3. It is an object, so it occupies space.

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SELECT emp_num, years, SUM(salary) FROM sales UNION ALL SELECT emp_id, SUM(takehomepay) FROM marketing What error is present in the sample code above? 1. Queries being combined with the UNION ALL statement are not allowed to have SELECT lists with a different number of expressions. 2. You are not allowed to use aggregate functions within two queries joined by a UNION ALL statement. 3. The UNION ALL statement incorrectly combines the "years" result from the first query with the "SUM (takehomepay)" result from the second query. 4. Unless the UNION ALL statement is replaced with a UNION statement, the queries will return duplicates. 5. The "emp_id" column from the second query must be renamed (or aliased) as "emp_num" so that it corresponds to the column name from the first query. Otherwise, the queries will not execute.

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