Answer / guest

Cause: A pseudocolumn or proscribed function was used in a
procedural statement. The SQL pseudocolumns (CURRVAL, LEVEL,
NEXTVAL, ROWID, ROWNUM) can be used only in SQL statements.
Likewise, certain functions such as DECODE, DUMP, and VSIZE
and the SQL group functions (AVG, MIN, MAX, COUNT, SUM,
STDDEV, VARIANCE) can be used only in SQL statements.

Action: Remove the pseudocolumn reference or function call
from the procedural statement. Or, replace the procedural
statement with a SELECT INTO statement; for example, replace
bonus := DECODE(rating, 1, 5000, 2, 2500, ...); with the
following statement: SELECT DECODE(rating, 1, 5000, 2, 2500,
...) INTO bonus FROM dual;

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