Data base Table

Table: Table is a collection of Multiple Record.

There are Three types of Table:
1. Transparent tables
2. Pool tables
3. Cluster tables

1. Transparent Table: The default table category is the transparent table.Transparent tables are one to one relationship. That is if you create one transparent table in the data dictionary, then it’ll store like only one data base table in the data base.

2. Pool Table:
A table pool is characterized as a database table on the database. The name of a table pool can have a maximum of ten characters. A table pool that already contains data can no longer be modified or deleted.

Creation of Pool Table is Two step Process:

1. Create Table Pool

2. Create Pooled Table

3. Cluster Table: 
Cluster tables are a special category of database table in ABAP Dictionary. They are defined by being saved in table clusters rather than being characterized as cluster tables on the database. No secondary indexes can be created for a cluster table.
Creation of Cluster Table is two step Process:
1. Fist Create Table Cluster.
2. Second Create Cluster Table.