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Equi Join: A join in which the joining condition is based on equality among values in the common columns. Common columns show (redundantly) in the result table. Let us Consider the following relations:
Example: What are the names of all customers who have placed orders?
The needed information is available in two tables, customer and order. The SQL solution needs joining the two tables by using equi join.
SELECT CUSTOMER.CUTOID, ORDER.CUSTOID, CUSTONAME, ORDERID
FROM CUSTOMER, ORDER
WHERE CUSTOMER.CUSTOID=ORDER.CUSTOID;
The output might be:
Customer.custoid
order.custoid
custoname
orderid
--------------------------
------------------
-----------------------
----------
10
Pooja Enterprises
1001
12
Estern Enterprises
1002
3
Impressions
1003
What is database Trigger? A database trigger is a PL/SQL block that can explained to automatically execute for insert, update, and delete statements against a table. The trigge
Partial Key : It is a group of attributes that can uniquely identify small entities and that are related to same base entity. It is sometime named as Discriminator. Altern
Define Query Processing Query processing is the process of selecting the best plan or strategy to be employed in responding to a database request. The plan is then executed to
projects?
Replication : It is definite as a copy of a relation. Every replica is stored at a dissimilar site. The alternative to replication is to store only single copy of a relation which
Define the categories of SQL Statements? 1) Statements that don't return a result set. This statement class includes INSERT, DELETE, and UPDATE. 2)Statements that return
What is association? Give an example of association Association is used for establishing relationships among classes. Association describe links among/between classes. For exa
Write short notes on Schema diagram. A database schema along with primary key and foreign key dependencies can be depicted pictorially by schema diagram. Every relation appears
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Define object-relational systems? Systems that give object-oriented extensions to relational systems are known as object-relational systems.
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