Answer / uma mb

These are three different kinds of table types in SAP.

The first most common type known to all is the 'Transparent
Table' which is a logical definition (in teh ABAP data
dictionary) of a physical table in the database.

Several tables logically defined in ABAP data dictionary can
be combined in a physical table (pool or cluster).

When functionally dependent data spread in many different
tables are kept in one database table, it comes to be known
as a cluster table. The key fields of these cluster tables
form the cluster key.

Pool table is just the opposite where tables are kept
together but they are not functionally dependent - rather
say all small master tables kept together as a pool would
form a pool table.

The true benefits of a cluster / pool table is data is
stored ina compressed form, so less memory space and less
network load.

There are some minus points also:

No native SQL can be used, no views, no joins, no scondary
indices, no GROUP BY, ORDER BY can be used. Table appends
not possible.

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