EC
1232
MySQLERRORCriticalSyntax / VariablesHIGH confidence

Incorrect argument type to variable

Production Risk

Low — SET fails safely; current value is unchanged.

What this means

ER_WRONG_TYPE_FOR_VAR (1232, SQLSTATE 42000) is raised when a value of the wrong data type is assigned to a system variable (e.g., assigning a string to a numeric variable).

Why it happens
  1. 1Assigning a string value to a numeric system variable
  2. 2Assigning NULL to a variable that doesn't accept NULL
How to reproduce
trigger — this will error
trigger — this will error
SET GLOBAL max_connections = 'many';  -- ERROR 1232 (string instead of integer)

expected output

ERROR 1232 (42000): Incorrect argument type to variable 'max_connections'

Fix

Use the correct data type for the variable

Use the correct data type for the variable
SET GLOBAL max_connections = 200;  -- integer, not string

Why this works

Match the data type expected by the system variable. Check documentation for the correct type.

Sources
Official documentation ↗

MySQL 8.0 — 1232 ER_WRONG_TYPE_FOR_VAR

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