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PLS-00307: Too many declarations match this call

What it means

More than one overload fits the call, so the call is ambiguous.

How to fix it

Use named notation or explicit conversions to pick one overload.

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.