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How to change user defined data type?

To change a user defined data type, all tables using it must be dropped, the data type must be dropped and everything has to be recreated.

The syscolumns system table contains the names of all the User Defined Data Type. Update the xtype (Data Type), length (data length), xprec (data field precision), xscale (data field scale) and etc. according to new requirement for that particular row which is the definition for the data type.

Related Link: How to alter a User Defined Data Type?

 

 

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DATETIME SELECT SELECT INTO DATE PAD STRING DYNAMIC SQL CURSOR MONEY FORMAT PERCENT STORED PROCEDURE SQL SERVER AGENT JOB OPTIMIZATION WHILE LOOP OVER PARTITION BY UPDATE