Multiple NULL values in column with UNIQUE index [duplicate]

Multiple NULL values in column with UNIQUE index [duplicate]

References

Reference NO 1

http://stackoverflow.com/questions/15206035/multiple-null-values-in-column-with-unique-index

Reference NO 2

http://bugs.mysql.com/66512

Reference NO 3

http://connect.microsoft.com/SQLServer/feedback/details/299229

Reference NO 4

http://sqlmag.com/database-development/multiple-nulls-unique-constraints

Reference NO 5

http://www.sqlservergeeks.com/articles/sql-server-bi/89/multiple-null-values-in-unique-constraint

Reference NO 6

http://consultingblogs.emc.com/jaceknieszporek/archive/2010/07/01/sql-server-and-unique-constrain-with-multiple-null-value-columns.aspx

Reference NO 7

http://sqlservercodebook.blogspot.com/2008/04/multiple-null-values-in-unique-index-in.html

Reference NO 8

https://forums.oracle.com/thread/376915?start=0&tstart=0