How add new column to the table in SQL Server Management?

Sometimes You would like to add column after created table.  But this action may be blocked.

To the testing I created database BazaTest and table of testowa name. At first table contains column of datatype int and column of name nazwa of text datatype. Columns will constraint only by null..

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After created and saved table, I added to this table column of int datatype.

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Unfortunately, attempt to save this column end to display  warning window.

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Blocking was missed  by writing in properties this column default value.

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In this case new column was written.

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Another way is check Allow Nulls check box. In this way the next column of  kolejna name  of  int datatype was added.

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And it is result:

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