Creating a Table from an Existing Table


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A copy of an existing table can be created using a combination of the CREATE TABLE statement and the SELECT statement. The new table has the same column definitions. All columns or specific columns can be selected. When you will create a new table using the existing table, the new table would be populated using the existing values in the old table.

Syntax

The basic syntax for creating a table from another table is as follows −

CREATE TABLE NEW_TABLE_NAME AS
   SELECT [ column1, column2...columnN ]
   FROM EXISTING_TABLE_NAME
   [ WHERE ]

Here, column1, column2... are the fields of the existing table and the same would be used to create fields of the new table.

Example

Following is an example, which would create a table SALARY using the CUSTOMERS table and having the fields customer ID and customer SALARY −

SQL> CREATE TABLE SALARY AS
   SELECT ID, SALARY
   FROM CUSTOMERS;

This would create a new table SALARY which will have the following records −

+----+----------+
| ID | SALARY   |
+----+----------+
|  1 |  2000.00 |
|  2 |  1500.00 |
|  3 |  2000.00 |
|  4 |  6500.00 |
|  5 |  8500.00 |
|  6 |  4500.00 |
|  7 | 10000.00 |
+----+----------+

sql-create-table.htm

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