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PLS-00357: Table, view or sequence reference not allowed in this context

What it means

A table or sequence was used in a PL/SQL expression outside SQL (before 11g: seq.NEXTVAL directly in PL/SQL).

How to fix it

Use it inside a SQL statement (SELECT seq.NEXTVAL INTO ...) or upgrade syntax (11g+ allows v := seq.NEXTVAL).

Catch it before it runs

ORA Error Helper
Explains ORA-/PLS- codes inside JetBrains IDEs and DataGrip.
PL/SQL Lint
Flags risky PL/SQL patterns while you type.
Oracle Plan Reader
Reads execution plans and points at the slow step.
PL/SQL in Practice
Kindle book with practical PL/SQL for working developers.

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Updated 2026-11-12.