- Can we create table from view?
- What is difference between view and table?
- How do you use view?
- Why view is used in SQL?
- How do I view views in SQL?
- Can we delete from view in Oracle?
- Which view is used to enter data in a table?
- Can we insert data into view in Oracle?
- Can we update views?
- What are triggers in Oracle?
- Does insert into create a new table?
- Why we need to create an index if primary key is already present in a table?
- Can we do DML on views?
- How do you insert data into a SQL view?
- What is the advantage of view in Oracle?
Can we create table from view?
CREATE TABLE yourTableName AS SELECT yourColumnName1,yourColumnName2,yourColumnName3,……..
N from yourViewName; To run the above query, first you need to create a table and after that you need to create a view on that table..
What is difference between view and table?
A view is a virtual table. A view consists of rows and columns just like a table. The difference between a view and a table is that views are definitions built on top of other tables (or views), and do not hold data themselves. If data is changing in the underlying table, the same change is reflected in the view.
How do you use view?
A view is nothing more than a SQL statement that is stored in the database with an associated name. A view is actually a composition of a table in the form of a predefined SQL query. A view can contain all rows of a table or select rows from a table.
Why view is used in SQL?
Views are used for security purposes because they provide encapsulation of the name of the table. Data is in the virtual table, not stored permanently. Views display only selected data. We can also use Sql Join s in the Select statement in deriving the data for the view.
How do I view views in SQL?
Using SQL Server Management StudioIn Object Explorer, click the plus sign next to the database that contains the view to which you want to view the properties, and then click the plus sign to expand the Views folder.Right-click the view of which you want to view the properties and select Properties.
Can we delete from view in Oracle?
When you delete rows from an updatable view, Oracle Database deletes rows from the base table. You cannot delete rows from a read-only materialized view. If you delete rows from a writable materialized view, then the database removes the rows from the underlying container table.
Which view is used to enter data in a table?
datasheet viewAnswer: datasheet view is used to enter data in a table.
Can we insert data into view in Oracle?
Summary: in this tutorial, you will learn about Oracle updatable view and how to insert or update data in the base tables through a view. A view behaves like a table because you can query data from it. … The following SQL statements create the cars and brands tables; and also insert sample data into these tables.
Can we update views?
The SQL UPDATE VIEW command can be used to modify the data of a view. All views are not updatable. So, UPDATE command is not applicable to all views. An updatable view is one which allows performing a UPDATE command on itself without affecting any other table.
What are triggers in Oracle?
Oracle allows you to define procedures that are implicitly executed when an INSERT, UPDATE, or DELETE statement is issued against the associated table. These procedures are called database triggers. … A trigger can include SQL and PL/SQL statements to execute as a unit and can invoke stored procedures.
Does insert into create a new table?
The primary difference is that SELECT INTO MyTable will create a new table called MyTable with the results, while INSERT INTO requires that MyTable already exists. You would use SELECT INTO only in the case where the table didn’t exist and you wanted to create it based on the results of your query.
Why we need to create an index if primary key is already present in a table?
When you specify a PRIMARY KEY constraint for a table, the Database Engine enforces data uniqueness by creating a unique index for the primary key columns. This index also permits fast access to data when the primary key is used in queries.
Can we do DML on views?
A view can be defined as a virtual table or a stored query and the data accessible through a view is not stored in the database as a distinct object. … However, views can be used and perform DML operations ( Insert , Update & Delete ) also.
How do you insert data into a SQL view?
‘100000.00’; To explain the INSERT INTO statement, I’m simply using SELECT after the name of our view, which is a very simple way to insert data into tables as we’re inserting new data based on the result of the SELECT statement. As can be seen, we can do data modifications through views.
What is the advantage of view in Oracle?
Views can join and simplify multiple tables into a single virtual table. Views can act as aggregated tables, where the database engine aggregates data (sum, average, etc.) and presents the calculated results as part of the data. Views can hide the complexity of data.