In mySQL 6
Virtual Column
Written by maclochlainn
http://blog.mclaughlinsoftware.com/2011/05/05/mysql-virtual-columns/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+orana+%28OraNA%29
and Official Site Preview
http://forge.mysql.com/wiki/MySQL_virtual_columns_preview
เอกสารอื่นๆ สามารถดูได้จาก MySQL forge
http://forge.mysql.com/
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