For each column in the table:
In the Column Name box, enter a name.
From the Data type list, select a datatype.
Enter the specifications appropriate to the datatype:
If the datatype is char, nchar, varchar, nvarchar, binary, or varbinary, enter a length for the datatype in the Size/Prec. column.
If datatype is decimal, numeric, or float, enter the precision in the Size/Prec. column. For decimal or numeric, precision is the maximum number of decimal digits that can be stored in the column. Specify a precision of 1 to 38. For float, precision is the number of significant binary digits in the mantissa.
If datatype is decimal or numeric, enter the scale in the Scale edit box. Scale is the maximum number of digits that can be stored to the right of the decimal point. The scale must be less than or equal to the precision. Specify a scale of 0 to 38.
Click in the Allow Nulls column to set null options:
Allow NULL values, indicated by a check mark
Do not allow NULL values, indicated by a blank.
To allow the column to contain a system-generated, sequential value that identifies each row in the table, right-click row, chose properties or double-click row or click the properties button on the menu and select Identity checkbox. Only one column in a table can have this characteristic. The datatype for the column must be numeric for the Identity option to be available.
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