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How to add a primary key to a mssql column
20.01.17
ALTER TABLE [SL].[dbo].[zz_styles] ADD PRIMARY KEY (av0_style) in case it has a null datatype: UPDATE [SL].[dbo].[zz_styles] SET [av0_style]=0 WHERE [av0_style] IS NULL ALTER TABLE [SL].[dbo].[zz_styles] ALTER COLUMN [av0_style] INTEGER NOT NULL ALTER TABLE [SL].[dbo].[zz_styles] ADD PRIMARY KEY (av0_style)
http://www.w3schools.com/sql/sql_primarykey.asp
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