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Answer Posted / sohini
Pseudocolumns are not actual columns in a table but they
behave like columns. For example, you can select values
from a pseudocolumn. However, you cannot insert into,
update, or delete from a pseudocolumn. Also, pseudocolumns
are allowed in SQL statements, but not in procedural
statements. PL/SQL recognizes the following SQL
pseudocolumns, which return specific data items: CURRVAL,
LEVEL, NEXTVAL, ROWID, and ROWNUM.
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