Answer Posted / p.ramakrishna

An SQL injection attack "injects" or manipulates SQL code
by adding unexpected SQL to a query.
Many web pages take parameters from web user, and make SQL
query to the database. Take for instance when a user login,
web page that user name and password and make SQL query to
the database to check if a user has valid name and password.
Username: ' or 1=1 ---
Password: [Empty]
This would execute the following query against the users
table:
select count(*) from users where userName='' or 1=1 --' and
userPass=''

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