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Natural Join: It is the similar like Equi join except one of the duplicate columns is removed in the result table. The natural join is the most usually used form of join operation.
Example :
SELECT CUSTOMER.CUTOID, CUSTONAME, ORDERID FROM CUSTOMER, ORDER
WHERE CUSTOMER.CUSTOID=ORDER.CUSTOID;
Output will be:
custoid custoname orderid
----------- --------------------- ----------
10 Pooja Enterprises 1001
12 Estern Enterprises 1002
3 Impressions 1003
Define upgrade and downgrade? It gives a mechanism for conversion from shared lock to exclusive lock is called as upgrade. It gives a mechanism for conversion from exclusive
Winfield is a small city with a population of 22,000 with buses serves three routes in Winfield and neighboring areas. As the city’s IT director, you have been asked to set up an i
Boyce-Code Normal Form (BCNF) A relationship is said to be in BCNF if it is already in 3NF and the left hand side of each dependency is a candidate key. A relation who is in 3N
Relational Model: The relational model uses a collection of tables to represent both data and the relationships among those data. Each table has multiple columns and each column h
In an E-R diagram an entity set is represent by? In an E-R digram entity set is represted by rectangle.
(1) Insert into PERSON Violated constraint: - Key constraint Reason: - Primary key 1 already exists in PERSON. Dealing: - DBMS could ask the user to provide valid PER
Give two profit of Reuse of Code. Reusing the implementation . Place existing class directly inside a new class. The new class can be made up of any number and type of the oth
List the types of authorization. A) Read authorization B) Write authorization C) Update authorization D) Drop authorization
what is definition hierarchical data model
Determine the term- Active values An active value is that has dependent values. Every dependent value registers itself with active value that contains a set of dependent values
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