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Creating a Table with SSMSE
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Let s use SSMSE to create a table named test_Employees in the Northwind database, using some of the columns of the Employees table. Note that this table name is prefixed with test_ to distinguish it from the Employees table.
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Try It Out: Creating a Table with SSMSE
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SSMSE provides a GUI for creating tables. Let s create test_Employees with it. 1. In Object Explorer, expand the Northwind node, right-click the Tables node, and click New Table . 2. In the window that opens, enter the information shown in Figure 10-1. We ve specified three columns: EmployeeId of type int, LastName of type nvarchar(30), and BirthDate of type datetime. You can choose the data type by clicking a Data Type cell and picking it from the drop-down list. Note that the BirthDate column has Allow Nulls checked. This means that rows can be inserted without birth date values (in other words, you may not know the birth date, but you can still insert a row).
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CHAPTER 10 s UNDERSTANDING TABLES AND RELATIONSHIPS
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Figure 10-1. Defining the test_Employees table
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3. Click the Save icon on the toolbar. When prompted for a name for the table, enter test_Employees and then click OK (see Figure 10-2). Note that the definition window is now named Table dbo.test_Employees.
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Figure 10-2. Creating the test_Employees table
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SSMSE has created a new table. To verify that the table was created, expand the test_Employees node in Object Explorer. It should appear as in Figure 10-3, with the column names you specified.
Figure 10-3. Checking the test_Employees table
Creating a Table with SQL
Behind the scenes, SSMSE actually generated SQL to create test_Employees. The simplest form of the CREATE TABLE statement is
CREATE TABLE tablename ( column1 datatype1 nullspec1, column2 datatype2 nullspec2, ..., columnn datatypen nullspecn )
CHAPTER 10 s UNDERSTANDING TABLES AND RELATIONSHIPS
where tablename is the name of the table you want to create, column1 is the name of the first column, datatype1 is the data type of column1, and nullspec1 specifies whether the column should allow null values. While most parts of this syntax are intuitive, notice that the null specifications for columns are either NULL or NOT NULL. And, though not apparent from the syntax, table names must be unique within schemas (e.g., dbo is the schema in Northwind to which all the tables we re working with belong) within a database.
s Note Actually, table names in SQL Server are composed of three parts, and it s the combination that must
be unique within a database. For simplicity we ve avoided the issue by using unique table names. Further, though you can use mixed case for table and column names, and SQL Server accepts this as the spelling for these database objects, SQL references to database objects aren t case sensitive. For example, you can refer to table test_Employees as test_employees (or even Test_employeeS); this also applies to column names.
Try It Out: Creating a Table with SQL
SSMSE can be used to edit and submit SQL, so let s submit a CREATE TABLE statement with it. To create a table similar to the one you saw in the previous section using the CREATE TABLE statement, use the following SQL to create a test_Employees2 table:
create table test_Employees2 ( EmployeeID int not null, LastName nvarchar(50) not null, BirthDate datetime null )
1. Click the Northwind node in Object Explorer. This makes Northwind the context in which you ll execute your SQL. Click New Query. An edit window opens as in Figure 10-4.
CHAPTER 10 s UNDERSTANDING TABLES AND RELATIONSHIPS
Figure 10-4. SQL edit window
2. Enter the CREATE TABLE statement for test_Employees2 and click Execute. The screen should appear as in Figure 10-5.
Figure 10-5. Creating test_Employees2
CHAPTER 10 s UNDERSTANDING TABLES AND RELATIONSHIPS
s Note In yet another bit of confusing database terminology, you used New Query to submit a statement!
Despite its name, the SQL edit window can handle both queries and statements.
How It Works
The CREATE TABLE statement was submitted and executed without error. To check this, right-click the Tables node under Northwind in Object Explorer and click Refresh. You ll see the new table, as in Figure 10-6.
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