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SAP / SAP Beginner (0 to 2 yrs) Interview questions

What is the difference between a transparent table and a pooled table?

A transparent table defined in the ABAP Data Dictionary has a direct, one-to-one correspondence with an actual physical table in the underlying database — its structure in SAP exactly mirrors the real database table, and you could even query it directly with database tools outside of SAP. A pooled table doesn't have its own dedicated physical database table; instead, several pooled tables' data is combined and stored together in a shared underlying database table called a table pool.

Transparent TablePooled Table
One-to-one mapping to a physical database table. Data shared with other pooled tables in one combined physical table.
Can be queried directly outside SAP with database tools. Only accessible meaningfully through SAP's own Open SQL layer.
Used for most business data (customers, orders, etc.). Traditionally used for internal SAP system control data.

The vast majority of business data you'd work with day-to-day (customer master, sales orders, materials) lives in transparent tables; pooled tables are a more specialized, less common category mainly seen in system-internal configuration areas.

What does a transparent table correspond to in the underlying database?
Where does a pooled table's actual data physically reside?

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