Clarification on the MySQL query [closed]

Clarification on the MySQL query [closed]

References

Reference NO 1

http://stackoverflow.com/questions/15199955/clarification-on-the-mysql-query

Reference NO 2

http://stackoverflow.com/questions/14067169/define-php-variable-name-with-result-of-mysql-query

Reference NO 3

http://www.yiiframework.com/forum/index.php/topic/27450-clarifying-mysql-query-for-failed-login/

Reference NO 4

http://dba.stackexchange.com/questions/6526/query-runs-a-long-time-in-some-newer-mysql-versions

Reference NO 5

http://bugs.mysql.com/49175

Reference NO 6

http://www.larryullman.com/forums/index.php?/topic/1041-clarification-on-when-to-use-mysqli-closedbc-and-mysql-free-result/

Reference NO 7

http://answers.google.com/answers/threadview/id/560639.html

Reference NO 8

http://ferruh.mavituna.com/sql-injection-cheatsheet-oku/