MySQL’s, and MariaDB’s, strict mode controls how invalid or missing values in data changing queries are handled; this includes INSERT, UPDATE, and CREATE TABLE statements. With MySQL strict mode enabled, which is the default state, invalid or missing data may cause warnings or errors when attempting to process the query.

When strict mode is disabled the same query would have its invalid, or missing, values adjusted and would produce a simple warning. This may seem like the preferred result, however with strict mode disabled certain actions may cause unexpected results; for instance, when the value being inserted exceeds the maximum character limit it will be truncated to fit the limit. Continue reading “How to Disable MySQL Strict Mode” →