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What are user defined datatypes and when you should go for them?
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User defined datatypes let you extend the base SQL Server datatypes by providing a descriptive name, and format to the database . Take for example, in your database , there is a column called Flight_Num which appears in many tables. In all these tables it should be varchar(8). In this case you could create a user defined datatype called Flight_num_type of varchar(8) and use it across all your tables. 

See sp_addtype, sp_droptype in books online.
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