<p>The query tried to divide a number by zero, which MySQL cannot compute, so it stopped execution and returned error 1365 (SQLSTATE 22012).</p>
<p>MySQL Error 1365: ER_DIVISION_BY_ZERO happens when a query divides by zero. Prevent it by validating denominator values or using NULLIF or CASE in the calculation.</p>
Division by 0
Error 1365 appears when a MySQL expression evaluates a division where the denominator equals zero. MySQL immediately stops the calculation and raises SQLSTATE 22012.
The error surfaces during SELECT, UPDATE, INSERT ... SELECT, or stored procedure execution. It is critical to address because it aborts the current statement, leaving data unchanged and applications waiting.
The denominator in an arithmetic expression is zero or becomes zero after evaluation. MySQL disallows division by zero to protect numeric consistency.
Unchecked user input, missing WHERE filters, or bad joins often create rows where the divisor column is zero.
Wrap the divisor with NULLIF to convert zero to NULL, or guard the calculation with CASE logic. Updating bad data or adding NOT NULL and CHECK constraints also resolves the problem.
Reports that calculate ratios, percentage change queries, and ETL scripts frequently mis-handle zero denominators. Adding conditional logic or filtering out zero rows prevents run-time failures.
Validate data on load, enforce CHECK (col <> 0) constraints, and favor defensive calculations such as value/NULLIF(denominator,0). Using Galaxy's AI copilot, you can auto-generate CASE expressions that safely skip zero values.
Other arithmetic errors like ER_DATA_OUT_OF_RANGE arise from invalid numeric operations. They differ in that the input value, not the arithmetic operator, is illegal. The fixes still involve validation and constraint design.
A table column meant for counts or totals contains actual zero rows due to data entry issues.
An expression like SUM(value) - SUM(value) returns 0, triggering the error when used in a subsequent division.
Front-end validation failed, allowing 0 as input, which flows into a stored procedure dividing numbers.
A LEFT JOIN creates NULLs that convert to 0 in arithmetic, unexpectedly making the divisor zero.
Occurs when a string cannot be cast to number during arithmetic.
Raised when a calculated number exceeds column limits.
Specific overflow for BIGINT math operations.
Warning instead of error when string fails numeric conversion under strict disabled.
No. It is intentional behaviour to preserve mathematical rules and data integrity.
No global setting exists. Use NULLIF or CASE in each query, or create virtual columns with safe logic.
sql_mode changes strictness but does not allow division by zero. Error 1365 always occurs.
Galaxy's AI copilot suggests NULLIF and CASE wrappers while you type, reducing manual fixes, and Collections let teams endorse the safe query pattern.
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