Inserting and Updating Data In a Table (Tutorial)

New: 14 April 2006

Now that you have created the Products table, you are ready to insert data into the table by using the INSERT statement. After the data is inserted, you will change the content of a row by using an UPDATE statement. You will use the WHERE clause of the UPDATE statement to restrict the update to a single row. The four statements will enter the following data.

ProductID	ProductName	Price	ProductDescription
1	Clamp	12.48	Workbench clamp
50	Screwdriver	3.17	Flat head
75	Tire Bar		Tool for changing tires.
3000	3mm Bracket	.52

The basic syntax is: INSERT, table name, column list, VALUES, and then a list of the values to be inserted. The two hyphens in front of a line indicate that the line is a comment and the text will be ignored by the compiler. In this case, the comment describes a permissible variation of the syntax.

To insert data into a table

1. Execute the following statement to insert a row into the Products table that was created in the previous task. This is the basic syntax.

   -- Standard syntax
   INSERT dbo.Products (ProductID, ProductName, Price, ProductDescription)
       VALUES (1, 'Clamp', 12.48, 'Workbench clamp')
   GO
   

2. The following statement shows how you can change the order in which the parameters are provided by switching the placement of the ProductID and ProductName in both the field list (in parentheses) and in the values list.

   -- Changing the order of the columns
   INSERT dbo.Products (ProductName, ProductID, Price, ProductDescription)
       VALUES ('Screwdriver', 50, 3.17, 'Flat head')
   GO
   

3. The following statement demonstrates that the names of the columns are optional, as long as the values are listed in the correct order. This syntax is common but is not recommended because it might be harder for others to understand your code. NULL is specified for thePricecolumn because the price for this product is not yet known.

   -- Skipping the column list, but keeping the values in order
   INSERT dbo.Products
       VALUES (75, 'Tire Bar', NULL, 'Tool for changing tires.')
   GO
   

4. The schema name is optional as long as you are accessing and changing a table in your default schema. Because the ProductDescription column allows null values and no value is being provided, the ProductDescription column name and value can be dropped from the statement completely.

   -- Dropping the optional dbo and dropping the ProductDescription column
   INSERT Products (ProductID, ProductName, Price)
       VALUES (3000, '3mm Bracket', .52)
   GO
   

To update the products table

1. Type and execute the following UPDATE statement to change the ProductName of the second product from Screwdriver, to Flat Head Screwdriver.

   UPDATE dbo.Products
       SET ProductName = 'Flat Head Screwdriver'
       WHERE ProductID = 50
   GO
   

Next Task in Lesson

Reading the Data in a Table (Tutorial)

See Also

Other Resources

INSERT (Transact-SQL)
UPDATE (Transact-SQL)

Help and Information

Getting SQL Server 2005 Assistance