Equi join-table handling, Database Management System

Assignment Help:

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:

  • Customer (custid, custname, ...........) and
  • Order (custid, ordered,....................)

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

10

Pooja Enterprises

1001

12

12

Estern Enterprises

1002

3

3

Impressions

1003

 

 

 

 


Related Discussions:- Equi join-table handling

System level permissions-data control, System level permissions : With the ...

System level permissions : With the use of data dictionary you can view them.       Let us take the table name as user_sys_privs (used in oracle).       DESCRIBE USER_SYS_PRI

Determine that the checkpoints are a part of, 1. Determine that the Checkpo...

1. Determine that the Checkpoints are a part of  Ans: Checkpoints are a part of Recovery measures

Define the terms- ddl and dml, Define the terms   i) DDL   ...

Define the terms   i) DDL   ii) DML   DDL: Data base schema is specified by a set of definitions expressed by a special   language known as a data def

Primary index, Primary index A primary index is a file that has a sorte...

Primary index A primary index is a file that has a sorted series of records having two columns: a block address for that key field in the data file; and the ordering key field.

What is natural language interfaces, What is Natural Language Interfaces? ...

What is Natural Language Interfaces? Natural Language Interfaces - These interfaces accept requests written within English or a few other language and attempt to "understand" t

Data replication, Data Replication "If a relation R has its copies kept...

Data Replication "If a relation R has its copies kept at two or more sites, then it is considered replicated". But why do we replicate a relation? There are several advan

What is a view, What is a view?  Make a view of EMP table named DEPT 20, to...

What is a view?  Make a view of EMP table named DEPT 20, to display the employees in department 20 and their annual salary.  Ans:  View is a virtual table that does not consist

What is key, What is key ? Key - A single attribute or a combination of...

What is key ? Key - A single attribute or a combination of two or more attributes of an entity set which is used to recognize one or more instances (rows) of the set (table) is

Horizontal Fragmentation, I want to fragment existing table using java code...

I want to fragment existing table using java code... help me..!!

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

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!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd