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Naresh Technologies Oracle Material Pdf
Naresh Technologies Oracle Material Pdf





Naresh Technologies Oracle Material Pdf
  1. #NARESH TECHNOLOGIES ORACLE MATERIAL PDF MOVIE#
  2. #NARESH TECHNOLOGIES ORACLE MATERIAL PDF PDF#
  3. #NARESH TECHNOLOGIES ORACLE MATERIAL PDF UPDATE#
  4. #NARESH TECHNOLOGIES ORACLE MATERIAL PDF SOFTWARE#
  5. #NARESH TECHNOLOGIES ORACLE MATERIAL PDF CODE#

#NARESH TECHNOLOGIES ORACLE MATERIAL PDF UPDATE#

Whenever the structures of the base tables change, you just need to update the view. You can expose the data from underlying tables to the external applications via views. The following query returns sales amount by the customer by year:Ĭode language: SQL (Structured Query Language) ( sql ) Maintaining logical data independence Then, you can access the data of the underlying tables through the view instead of rewriting the whole query again and again. First, you build a complex query, test it carefully, and encapsulate the query in a view. Views help simplify data retrieval significantly. The most common uses of views are as follows: You can use views in many cases for different purposes. If you rename or drop one of the columns referenced by the query such as name or credit_limit, the view customer_credits will not work anymore. The customer_credits view is also dependent on the structure of the customers table. The result set returned from the customer_credits view depends on the data of the underlying table, which is the customers table in this case. Also, a query that defines the view is called a defining query. In this example, the customers table is called the base table. Suppose, we assign the query above a name called customer_credits and query data from this view:Ĭode language: SQL (Structured Query Language) ( sql ) When you query data from a view, Oracle uses this stored query to retrieve the data from the underlying tables. And it is just a named query stored in the database. To be precise, a view only behaves like a table. Unlike a table, a view does not store any data. Every view has columns with data types so you can execute a query against views or manage their contents (with some restrictions) using the INSERT, UPDATE, DELETE, and MERGE statements. So by definition, a view is a “virtual” table whose data is the result of a stored query, which is derived each time when you query against the view.Ī view is a virtual table because you can use it like a table in your SQL queries. This is why sometimes a view is referred to as a named query. If you give this query a name, then you have a view. It contains only partial data from the customers table. The derived table consists of the name and credit limit ( credit_limit) columns with many rows.

#NARESH TECHNOLOGIES ORACLE MATERIAL PDF CODE#

java .Customers Code language: SQL (Structured Query Language) ( sql ) from Oracle tutorial) sh f= co 9100102, } = US con MyProgran. area |, Naresh i Technologies Complete Java Corelava with SCIP and JVM. o Basic Java programming elerhents © Essential Statements of Java.

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Naresh Technologies Oracle Material Pdf

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  • Naresh Technologies Oracle Material Pdf