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.

In start of selection, if we perform validation, what happens ?

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