Possible to check if a number is IN a GROUP_CONCAT

Possible to check if a number is IN a GROUP_CONCAT

References

Reference NO 1

http://stackoverflow.com/questions/15203134/possible-to-check-if-a-number-is-in-a-group-concat

Reference NO 2

http://stackoverflow.com/questions/12101191/group-concat-return-null-if-any-value-is-null

Reference NO 3

http://dev.mysql.com/doc/refman/5.1/en/group-by-functions.html

Reference NO 4

http://mahmudahsan.wordpress.com/2008/08/27/mysql-the-group_concat-function/

Reference NO 5

http://www.h2database.com/html/functions.html

Reference NO 6

http://www.mysqlperformanceblog.com/2006/09/04/group_concat-useful-group-by-extension/

Reference NO 7

http://postgresql.1045698.n5.nabble.com/Seamless-replacement-to-MySQL-s-GROUP-CONCAT-function-td5766314.html

Reference NO 8

http://www.sqlite.org/lang_aggfunc.html