Slide 7.6: SQL insert into statement
Slide 7.8: SQL select statement
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SQL Insert into Statement (Cont.)

Insert Data Only in Specified Columns
The insert into statement can be with or without all column names: 

 INSERT INTO  Persons  (P_Id, LastName, FirstName, Address, City)
   VALUES (4 ,'Nilsen', 'Johan', 'Bakken 2', 'Stavanger');

One row is added after the above insert into statement executes:

P_Id LastName FirstName Address City
1 Hansen Ola Timoteivn 10 Sandnes
2 Svendson Tove Borgvn 23 Sandnes
3 Pettersen Kari Storgt 20 Stavanger
4 Nilsen Johan Bakken 2 Stavanger

It is also possible to only add data in specific columns. The following SQL statement will add a new row, but only add data in the P_Id, LastName, and FirstName columns: 

 INSERT INTO  Persons  (P_Id, LastName, FirstName)
   VALUES (5 ,'Tjessem', 'Jakob');

The columns not specified are inserted with values NULL, which represents missing unknown data. NULL values are treated differently from other values. It is used as a placeholder for unknown or inapplicable values.

P_Id LastName FirstName Address City
1 Hansen Ola Timoteivn 10 Sandnes
2 Svendson Tove Borgvn 23 Sandnes
3 Pettersen Kari Storgt 20 Stavanger
4 Nilsen Johan Bakken 2 Stavanger
5 Tjessem Jakob    


Demonstration
The following is an SQL test area from W3Schools, which uses the well-known Northwind sample database and the tables are for read only.
For security reasons, the following demonstration may only work in Chrome.

SQL Statement:

Edit the SQL statement and click     to see the result, or    

Result:

Click “Run SQL” to execute the SQL statement above.
W3Schools has created an SQL database in your browser.
The menu to the right displays the database, and will reflect any changes.
Feel free to experiment with any SQL statement.
You can restore the database at any time.
The Database includes:
The Database includes:

TablenamesRecords
Customers91
Categories8
Employees10
OrderDetails518
Orders196
Products77
Shippers3
Suppliers29