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CREATE TABLE AS


The CREATE TABLE AS statement is used to create a table from an existing table by copying the columns of existing table.

Note: If you create the table in this way, the new table will contain records from the existing table.

Syntax:

  1. CREATE TABLE new_table
  2. AS (SELECT * FROM old_table);

Create Table Example: copying all columns of another table

In this example, we are creating a “newcustomers” table by copying all the columns from the already existing table “Customers”.

  1. CREATE TABLE newcustomers
  2. AS (SELECT *   FROM customers  WHERE customer_id < 5000);
Table created.

This table is named as “newcustomers” and having the same columns of “customers” table.

Create Table Example: copying selected columns of another table

Syntax:

  1. CREATE TABLE new_table
  2.   AS (SELECT column_1, column2, … column_n
  3.       FROM old_table);

Let’s take an example:

  1. CREATE TABLE newcustomers2
  2. AS (SELECT customer_id, customer_name
  3.     FROM customers
  4.     WHERE customer_id < 5000);

The above example will create a new table called “newcustomers2”. This table includes the specified columns customer_id and customer_name from the customers table.

Create Table Example: copying selected columns from multiple tables

Syntax:

  1. CREATE TABLE new_table
  2. AS (SELECT column_1, column2, … column_n
  3.     FROM old_table_1, old_table_2, … old_table_n);

Let’s take an example: Consider that you have already created two tables “regularcustomers” and “irregularcustomers”.

The table “regularcustomers” has three columns rcustomer_id, rcustomer_name and rc_city.

  1. CREATE TABLE  “regularcustomers”
  2.    (    “RCUSTOMER_ID” NUMBER(10,0) NOT NULL ENABLE,
  3.     “RCUSTOMER_NAME” VARCHAR2(50) NOT NULL ENABLE,
  4.     “RC_CITY” VARCHAR2(50)
  5.    )
  6. /

The second table “irregularcustomers” has also three columns ircustomer_id, ircustomer_name and irc_city.

  1. CREATE TABLE  “irregularcustomers”
  2.    (    “IRCUSTOMER_ID” NUMBER(10,0) NOT NULL ENABLE,
  3.     “IRCUSTOMER_NAME” VARCHAR2(50) NOT NULL ENABLE,
  4.     “IRC_CITY” VARCHAR2(50)
  5.    )
  6. /

In the following example, we will create a table name “newcustomers3” form copying columns from both tables.

Example:

  1. CREATE TABLE newcustomers3
  2.   AS (SELECT regularcustomers.rcustomer_id, regularcustomers.rc_city, irregularcustomers.ircustomer_name
  3.       FROM regularcustomers, irregularcustomers
  4.       WHERE regularcustomers.rcustomer_id = irregularcustomers.ircustomer_id
  5.       AND regularcustomers.rcustomer_id < 5000);

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