EC
1319
MySQLerrorstored-procedureshigh confidence

Undeclared variable

Production Risk

Low — compile-time error; routine not created.

What this means

A stored routine referenced a local variable that was never declared with DECLARE.

Why it happens
  1. 1Typo in variable name
  2. 2Variable declared in a nested block and referenced outside it
  3. 3Missing DECLARE statement
How to reproduce
trigger — this will error
trigger — this will error
CREATE PROCEDURE p() BEGIN SET undeclared_var = 1; END;

expected output

ERROR 1319 (42000): Undeclared variable: undeclared_var

Fix

Add a DECLARE statement

Add a DECLARE statement
DECLARE undeclared_var INT DEFAULT 0;

Why this works

All local variables in stored routines must be explicitly declared.

What not to do

✕

Sources
Official documentation ↗

MySQL 8.0 — 1319 ER_SP_UNDECLARED_VAR

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