SQL INSERT INTO SELECT Keyword
INSERT INTO SELECT
The INSERT INTO SELECT command copies data 
from one table and inserts it into another table.
The following SQL copies "Suppliers" into "Customers" (the columns that are not filled with data, will contain NULL):
Example
 INSERT INTO Customers (CustomerName, 
  City, Country)
 SELECT SupplierName, City, Country FROM Suppliers;
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The following SQL copies "Suppliers" into "Customers" (fill all columns):
Example
  INSERT INTO Customers (CustomerName, ContactName, Address, City, PostalCode, 
  Country)
SELECT SupplierName, ContactName, Address, City, PostalCode, 
  Country FROM Suppliers;
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The following SQL copies only the German suppliers into "Customers":
Example
 INSERT INTO Customers (CustomerName, 
  City, Country)
 SELECT SupplierName, City, Country FROM Suppliers
WHERE Country='Germany';
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