SQL 201-SELECT INTO
I’ve already shown you how to create a table, and how to INSERT data into that table. But did you know you can do both in one statement? The SELECT INTO statement selects data from one table and inserts it into a different table. I use the SELECT INTO statement is to create backup copies of tables, but you may also use it to select part of one table into a separate table, or for any other reason you can come up with!
SQL SELECT INTO Syntax
We can select all columns into the new table:
SELECT * INTO new_tableName FROM old_tableName
Or we can select only the columns we want into the new table:
SELECT column_name(s) INTO new_tableName FROM old_tableName
SQL SELECT INTO Example
Make a Backup Copy – Now we want to make an exact copy of the data in our “Persons” table.
We use the following SQL statement:
SELECT * INTO Persons_Backup FROM Persons
We can also copy only a few fields into the new table:
SELECT LastName,FirstName INTO Persons_Backup FROM Persons
SQL SELECT INTO – With a WHERE Clause
We can also add a WHERE clause.
The following SQL statement creates a “Persons_Backup” table with only the persons who lives in the city “Sandnes”:
SELECT LastName,Firstname INTO Persons_Backup FROM Persons WHERE City='Charlotte'
SQL SELECT INTO – Joined Tables
Selecting data from more than one table is also possible.
The following example creates a “Persons_Order_Backup” table contains data from the two tables “Persons” and “Orders”:
SELECT Persons.LastName,Orders.OrderNo INTO Persons_Order_Backup FROM Persons INNER JOIN Orders ON Persons.P_Id=Orders.P_Id
Let me know if you have any questions. I’m here to help you learn as much as you want about Microsoft SQL!