Use the SQL command DROP VIEW to drop a view. For example: DROP VIEW Accounts_staff;Modifying a Join View Oracle allows you, with some restrictions, to modify views that involve joins. Consider the following simple view: CREATE VIEW Emp_view AS SELECT Ename, Empno, deptno FROM Emp;...
Indexes. They're one of the most powerful and misunderstood aspects of SQL performance. In this post we'll look at the purpose of an index, how to create and choose choose your index type. Then finish with a discussion of how to decide what to index and
Steps for Connecting SQL Server and Oracle 1. Creating the mwrep User Perform the following actions to create a new database user: It should be noted that you can skip these steps if you already have a system orcl connection and a mwrep user. Step 1: Use the desktop icon to launch ...
We have a database tools (abbreviated as DBT) application that stores all the information of our MySQL, PostgreSQL, Microsoft SQL Server and Oracle RDBMS databases in one location. This DBT-application links a given database to an application, the database to an instance and the ...
I’ve always appreciated the CREATE OR REPLACE functionality in Oracle for views, packages and triggers, and I’ve often wanted a similar CREATE OR REPLACE TABLE. Many times, I’ll find myself needing to quickly drop and re-create a table while I’m designing it. ...
Querying Data at a Point in Time (Flashback Query)Although some Oracle tools and applications simplify or mask the use of SQL, all database operations are performed using SQL, to take advantage of the security and data integrity features built into Oracle.Overview...
create table toys_clone as select * from toys;Easy, right?Yes. But, as always, there's more to it than this. You'll want to add some constraints to your table. And there are many types of table available in Oracle Database, including:Table...
DROP VIEW salesman_contacts;Code language: SQL (Structured Query Language) (sql) In this tutorial, you have learned how to use the Oracle DROP VIEW statement to drop a view from a database. Was this tutorial helpful? Yes No Previously Oracle CREATE VIEW Up Next Oracle Updatable View ...
MySQL derives part of its name from the SQL language, which is used for managing and querying data in databases. MySQL offers full ACID transactions and can handle a high volume of concurrent connections. MySQL Explained MySQL is an open source RDBMS that uses SQL to create and manage database...
Before Oracle 12c, we don’t have a direct method of generating an AUTO_INCREMENT column in a table. We need to use the combination of Sequences and