Answer / stl

We use sql in Database testing. to see the impact of front
end changes are correctly posted on the backend database

Answer / rajendra prasad reddy,p

AS a Basic concept Database is two types
1.DBMS-Database Management Systems
2.RDBMS-Relational Database Management System

In DBMS the data will be stored in tables.It is not
possible to compare one table with another table in
DBMS.Like MS Access.

but in the case RDBMS we can create Data in the form of
tables and also it is possible to create relations from one
table to another table i.e we can compare one table data
with Another table data

SQL -Structured Query Language.
Mainly It has three parts

1.DDL-Data Definition Language
2.DML-Data Manipulation Language
3.TCL-Transaction Control Language

DDL contains following Operations
a.Create
b.Alter
c.Drop
d.Truncate
DML contains Following Operations
a.Select
b.Insert
c.Update
d.Delete
TCL contains Following operations
a.Commit
b.RollBack
Some famous database names are
MS SQL Server from Microsoft
(less secure conpared to oracle)
Oracle from Oracle Corporation
(highly Secure then SQL Server)
MySql Open Source DataBase(Free Available Databse)

Allthe above three widely using databases are built on
SQL.
In case of Testing SQL plays important role.
After creating Database it has ti be tested throughly.
Testing of database two types
1.Testing database directly by writing SQL
queries on the Back-end database and cross checking the
database vaidity.
2.Testing the database From front end,It requires
no knowledge of SQL skills
i.e we enter the data from front end and we will retrieve
from the front end.
Now a days Almost 90% of the applicationswill have
database.
Ok friends ,
Rajenda_prnumalli@yahooo.com

Which one of the following is a reason that an INSERT statement might cause an error instead of executing correctly? 1. The INSERT statement was attempting to insert a record into a view that was created from more than one table. 2. The INSERT statement was attempting to insert a record using a combination of constants and values from an existing table. 3. The INSERT statement was attempting to insert a record with a non-NULL value into a table that has that column defined as NULL. 4. The INSERT statement was attempting to insert a record into a table by selecting a record from that same table. 5. The INSERT statement was attempting to insert a record into a view rather than a table.

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