Choose your database:
AnySQL
MySQL
MS SQL Server
PostgreSQL
SQLite
Firebird
Oracle
SQL Anywhere
DB2
MaxDB

Subscribe to our news:
Partners
Testimonials
Ilakshi Rathod : "This tool is just wonderful. I have never seen any tool for DB2. This tool provides very good features which helps in ease us work as well as quick resolution of any errors.".
Jeff Rule: "I have to tell you I am really impressed. I have never had a software company turn around a bug fix like this so fast. I have been doing database work for over 20 years and that has never happened.".

More

Add your opinion

SQL Maestro Group / Products / DB2 / DB2 Maestro / Documentation

DB2 Maestro online Help

Prev Return to chapter overview Next

Split table

It's not an uncommon situation when new requirements arise, or when you need to enforce referential integrity on a set of columns, and the best decision is to split a table into two separate tables. DB2 Maestro provides you with Split Table Wizard, a simple tool to generate a bunch of SQL scripts to modify the primary table, to create a secondary table with a primary key, and to transfer data from the primary table to the secondary one without duplicating of data. To invoke the wizard, follow the corresponding link of the Generate SQL section of popup menu of the selected table at the Explorer tree.

 

 

Let's see the wizard in action on the example of a table with the following SQL definition:

 

CREATE TABLE person (

  id         integer NOT NULL,

  city       varchar(30) NOT NULL,

  full_name  varchar(30) NOT NULL,

  /* Keys */

  CONSTRAINT person_pkey

    PRIMARY KEY (id)

);

 

The table stores sample data:

 

 

To enforce the referential integrity, we specify 'city' as secondary table:

 

 

The primary table must contain now only 'id' and' full_name' columns. The field 'city_id' will be added to the table automatically.

 

Now we have to specify what kind of primary key to be created for the secondary table: surrogate or natural. We create create the 'city' table with a surrogate primary key.

 

 

Then click Ready and get the following tables:

 



Prev Return to chapter overview Next