How to add a comment to an existing table column in SQL Server? [duplicate]

Answer 1

That depends on what you mean by "comment". If you want to add descriptive text to a column, you can set the Column Description using SQL Server Management Studio:

• Table Column Properties (SQL Server Management Studio)

To set the description programmatically, you can use the sp_addextendedproperty, sp_updateextendedproperty and sp_dropextendedproperty stored procedures. Example:

EXEC sp_addextendedproperty 
    @name = N'MS_Description', @value = 'This is the description of my column',
    @level0type = N'Schema', @level0name = 'dbo',
    @level1type = N'Table', @level1name = 'MyTable', 
    @level2type = N'Column', @level2name = 'MyColumn'

I admit that the syntax is a bit inconvenient -- the following blog post contains stored procedures that make this process a bit easier:

• T-SQL Tuesday: Easy Extended Properties

Answer 2

While creating the new table in the SQL Server Management Studio, Please refer to the below mentioned screen shot for adding the description to a column.

Another way to do it programatically

EXEC sp_updateextendedproperty 
@name = N'MS_Description', @value = 'Your description',
@level0type = N'Schema', @level0name = dbo, 
@level1type = N'Table',  @level1name = Your Table Name, 
@level2type = N'Column', @level2name = Yuur Column Name;