ARTICLE
Primary Table Key
Each internal table has a primary
table key that is either a self-defined key
or the standard key . For
hashed tables , the primary key is a
hash key , for
sorted tables , the primary key is a sorted
key . Both of these table types are key
tables for which key access is optimized and the primary key thus has
its own administration. The key fields of these tables are
write-protected when you access individual rows.
Standard tables also have a primary
key, but the corresponding access is not optimized, there is no separate
key administration, and the key fields are not write-protected.
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