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Table extension functionality allows sharing fields with a parent table. Administrators and developers extend tables during table creation.

Typically, tables are extended to create a set of records that share information with each other.

In the use case listed below, the Task table has multiple extensions:

A table extending another table is called a child table, and a table extended by it is called a parent table. A table can be both a parent and a child at the same time.

Table extending causes the following:

• Cross-table linking between from the new table to the extending one;
• System fields are created in the new table (like the sys_id field).

Necessary tools

Instance administrators can use the All Tables tool to understand the relationships between the tables. To perform this, please complete the steps below:

1. Navigate to System Definition → All Tables;
2. Select the table you are interested in by typing its title in the search bar;
3. Navigate to this table;
4. The value in the Parent field is the title of the parent table, the one from which the current table is sharing fields.