1340
MariaDBwarningdatahigh confidence
Division by 0
Production Risk
Medium — silent NULL in non-strict mode can propagate incorrect calculations.
What this means
A division or modulo operation attempted to divide by zero. In strict mode this is an error; otherwise the result is NULL with a warning.
Why it happens
- 1Dividing a column value by another column that contains zero
- 2Hard-coded divisor of 0 in a query
- 3Computed denominator that can evaluate to zero
How to reproduce
trigger — this will error
trigger — this will error
SELECT 10 / 0;
expected output
Warning 1365 (22012): Division by 0 (NULL returned)
Fix 1
Guard with NULLIF
Guard with NULLIF
SELECT 10 / NULLIF(denominator, 0) FROM t;
Why this works
Returns NULL instead of causing an error when the denominator is 0.
Fix 2
Use CASE to handle zero
Use CASE to handle zero
SELECT CASE WHEN denominator = 0 THEN NULL ELSE value / denominator END FROM t;
Why this works
Explicit branch avoids division by zero.
What not to do
✕
Version notes
Sources
Official documentation ↗
MySQL 8.0 — 1365 ER_DIVISION_BY_ZERO (also raised as 1340 context)
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