<p>MySQL throws ER_TRUNCATED_WRONG_VALUE_FOR_FIELD (1366) when a supplied value cannot be stored in the target column because of an invalid data type or format.</p>
<p>MySQL Error 1366: ER_TRUNCATED_WRONG_VALUE_FOR_FIELD arises when a value does not fit the column data type or format. Fix it by validating input, casting data, or altering the column to match the incoming value.</p>
Incorrect %s value: '%s' for column '%s' at row %ld
Error 1366 appears when MySQL receives a value that cannot be stored in a column because its type or format is incompatible. The server rejects or truncates the value and raises the error in strict SQL mode.
The message looks like: Incorrect %s value: '%s' for column '%s' at row %ld. It pinpoints the bad value, column, and row, helping you locate the problem quickly.
The error is triggered by data type mismatches, invalid date or time strings, out-of-range numbers, or incorrect character encodings. Strict SQL mode turns what could be a warning into a full error.
User input, ETL jobs, or application code that bypasses validation frequently introduce malformed data. Bulk loads from CSV files are another common culprit.
Identify the failing row with SELECT or by rerunning the INSERT with LIMIT. Validate and sanitize each value in application code before sending it to MySQL. Use CAST or CONVERT to coerce input when appropriate.
Alternatively, adjust the target column with ALTER TABLE to accommodate the incoming data type or size. For immediate relief, you can relax sql_mode, but that should be temporary.
Invalid date like '2024-02-30' in a DATE column causes the error; fix by correcting the date string. Oversized varchar values need column length expansion or truncation logic.
Decimal overflow happens when a number exceeds the defined precision. Increase the precision or round the number before insertion.
Keep strict SQL mode on in production to surface problems early. Validate all user input at the application layer and use prepared statements. Monitor ingestion pipelines for truncation warnings.
Adopt Galaxy’s AI copilot to preview query results and detect problematic rows before commits, reducing runtime surprises.
Error 1292 (Truncated incorrect datetime value) appears for invalid datetime strings and is fixed in a similar way: validate and convert input before insertion. Error 1406 (Data too long for column) surfaces when varchar or text data exceeds column size; increase column length or trim data.
Inserting strings into numeric columns or vice versa triggers the error because MySQL cannot coerce the value under strict mode.
Date strings with impossible calendar values or wrong formats cause the server to reject the row.
Numbers exceeding DECIMAL or INTEGER precision throw error 1366 when strict mode is active.
Supplying UTF-8 bytes to a latin1 column produces invalid byte sequences that MySQL refuses to store.
Occurs when a datetime string is invalid. Fix by validating dates or adjusting column type.
Raised when varchar or text input exceeds column length. Resolve by enlarging the column or trimming data.
Appears when numeric input exceeds column range. Increase precision or clamp the value.
It prevents the error but may silently corrupt data. Enable it only during controlled bulk loads.
MySQL reports row 0 when the failure occurs before any data is inserted, often in multi-row statements.
Galaxy validates data types, previews result sets, and flags potential mismatches before you run INSERT or UPDATE.
Yes. Inserting UTF-8 bytes into latin1 columns can trigger the error due to invalid encoding.
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