In Tableau, how do I insert a TextBox into the dashboard for user to enter data and also this user entered data shoudl be used in the custom query where condition.
Are you talking about custom SQL? In the coming v8 you can use a parameter in custom SQL. This parameter could be completed in a text field for the parameter.
If you are not talking about that, you can use a quick filter with text entry: http://onlinehelp.tableausoftware.com/v7.0/server/en-us/filter_quick.htm
See the wildcard match section.
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