How to Create Tables in your SQL Server Database in C# .NET

How to Create Tables in your SQL Server Database

Now that you have created the database itself, you need to create at least one table to go in it.
To create a table, right click on the database in the Solution Explorer. From the menu that appears, select Open:
Open a database from the Solution Explorer
When you click Open, you'll see the Database Explorer appear on the left hand side of your screen:
The Database Explorer in Visual Studio
To create a new table, right click on Tables. From the menu that appears, select Add New Table:
(In Visual Studio Express 2010, you may get an error message along the lines of "This server version is not supported. Only servers up to Microsoft SQL Server 2008 are supported." If you do, you'll need the SQL Server Data Tools from here:
If you still get no joy creating tables in your database after downloading the SQL Server Data Tools then you can use our database. You'll find the Employees database in the extra files here on our site: extra files. You can add it as a resource later.)

When you click on Add New Table you should see the table designer open up in the centre of your screen. This will be a different designer, depending on which version of Visual Studio Express you have. For VS Express 2013 users, click here to go to your section:

For VS express 2010 and 2012 users, when you click Create Table or Add New Table, you'll see a dialogue box appear. This one:
Create a table in Visual Studio 2010, 2012
This screen is where you set up the Columns that go in the table. You'll get to enter the actual data later. But you need to tell SQL Server what kind of data (Data Type) is going into each column.
First, though, type a name for your table in the Name box at the top. Call the table tbl_employees.
For the first column in the table, type ID in the in the Column Name box. You'll then see some more information appear:
Setting up an ID field in the database table
We'll set the ID column as a Primary Key. Click into the Primary Key box and select Yes from the dropdown list:
Setting a Primary Key
For the other values, set the Data Type to int, the Length to 4, Allow Nulls to No, and Unique toYes. Your first column should then look like this:
ID Field properties
The Primary Key field, the ID column, will need to have a new integer assigned every time a new entry is added to the table. In other databases, this is known as an auto increment number. So that this happens automatically without us having to worry about it, have a look at the bottom of your Table screen. You should see a Properties area. Click on Identity and set it to True:
Setting an Auto Increment option
The Increment value is set to 1, meaning the database itself will automatically add 1 when a new record is added.
Using the same technique as above, create the following Column Names, Data Types, Length Allow Nulls, Unique and Primary Key values:
The fields in the database table
If you're not too sure about database terminology by the way, here are what all those headings and values mean:
Data Type - This is the kind of data going into a table column. The ID column can only have intergers, while all the others can only have text (nvarchar).
Length - How many characters or digits the field can hold.
Allow Nulls - A Null value is one where nothing is set for that field, not even a zero or a blank string.
Unique - This means whether or not you can have duplicate values in this field
Primary Key - This is used for things like linking tables together, indexing a long table, and for searching.
Click OK when you've finished adding all the information to the New Table dialogue box. Your Database Explorer should show you the new table you've just added:
The Database Explorer showing the added table
Now that you've set up the table, you can start adding data to it. Click the link below, Add data to your table.