Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Write a short note on QBE?
Stands for "Query By Example." QBE is a feature involved along with various database applications which gives user-friendly techniques of running database queries. Typically without QBE, a user must write input commands using right SQL (Structured Query Language) syntax. This is a standard language in which nearly all database programs support. Therefore, if the syntax is slightly incorrect the query might return the wrong results or may not run at all. The Query By Example feature gives a simple interface for a user to enter queries. Instead of writing an whole SQL command, the user can just fill in blanks or select items to describe the query she needs to perform. For instance, a user may need to select an entry from a table called "Table1" with an ID of 123. Using SQL, the user would required to input the command, "SELECT * FROM Table1 WHERE ID = 123". The QBE interface might permit the user to just click on Table1, type in "123" in the ID field and click "Search." QBE is offered along with most database programs, by the interface is often different among applications. For example, Microsoft Access has a QBE interface known as "Query Design View" which is totally graphical. The phpMyAdmin application used along with MySQL, offers a Web-based interface whereas users can choose a query operator and fill in blanks with search terms. Whatever QBE implementation is given with a program, the purpose is the similar - to make it easier to run database queries and to prevent the frustrations of SQL errors
he SQL query that will return the order number, quantity ordered, price each and total cost of an order (quantity * price each) from the order details table. Label the calculated c
Create role named role_table that allows a user to create tables. Using role_table allow users kripa and reena to create tables. CREATE ROLE role_table; GRANT CREATE ANY TABLE
Suppose an instruction takes 1 nanosecond to execute (on average), a page fault takes 20 microseconds of processor time, and it takes 300 microseconds of disk time to read or write
Give the Introduction of OBJECT DESIGN Strategies which are selected during system design are carried out in object-oriented design. In this procedure, objects which are identi
What are the General Transformation Rules for Relational operations? Ans: The transformation rules transform one relational algebra expression to AN EQUIVALENT ONE 1. E
What is Disadvantages Of DBMS ? 1. Cost of Software and Hardware and Migration - A important disadvantage of the DBMS system is cost. 2. Reduced Response and Throughpu
Consider the table student and list names of students in the departments other than maths and computer. SELECT std_name FRM student WHERE dept_name NOT IN (‘Maths','Computer);
Describe the host language? Host Language: You could write applications along with SQL statements embedded inside a host language. The SQL statements give the database inter
Objectives After reading this part, you should be able to: Modify, create, and delete database schema objects; Update database using SQL command; Retrieve data f
1. Determine that the Checkpoints are a part of Ans: Checkpoints are a part of Recovery measures
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd