The server raises ER_INCORRECT_TYPE (error 3064, SQLSTATE HY000) when a function receives an argument of the wrong data type.
MySQL error 3064 ER_INCORRECT_TYPE appears when a function argument is of the wrong data type. Cast or convert the value to the expected type, or choose a function that matches the argument type, to resolve the error quickly.
ER_INCORRECT_TYPE
MySQL returns error 3064 with the condition name ER_INCORRECT_TYPE when a built-in or user-defined function receives an argument whose data type does not match the function signature.
The server stops the statement, emits SQLSTATE HY000, and shows the message Incorrect type for argument %s in function %s, highlighting the argument position and function name.
Type mismatches usually occur when string literals are passed to numeric functions, numeric values to string functions, or JSON objects to scalar functions without proper casting.
Implicit conversions cover many cases, but strict SQL modes, stored programs, and certain optimizers disable silent coercion, making the mismatch fatal.
First, identify the function and argument index in the error message. Verify the expected data type in the MySQL documentation or by calling SHOW FUNCTION STATUS.
Next, CAST or CONVERT the offending argument to the required type, or replace the function with one designed for the supplied type.
Passing varchar dates to DATE_ADD without STR_TO_DATE triggers the error. Convert the string to DATE before calling DATE_ADD.
Calling ABS on a varchar column fails in strict mode. CAST the column to DECIMAL or use a numeric column directly.
Always validate data types at ingestion, store dates in DATE or DATETIME columns, and enable strict SQL mode only after cleansing your data.
Use explicit CAST in SELECT statements, unit-test stored procedures with representative data sets, and adopt a modern SQL editor such as Galaxy to surface type hints early.
Error 1366 incorrect string value appears when character sets clash; resolve it by matching collations or using CONVERT.
Error 1292 invalid datetime format signals bad temporal values; sanitize or cast strings to proper date formats before use.
Using a quoted value like '10' in ABS or MOD fails in strict SQL mode.
Supplying 12345 to CONCAT_WS causes a mismatch when the function expects text strings.
Calling LENGTH on a JSON column triggers the error; use JSON_LENGTH instead.
sql_mode=STRICT_ALL_TABLES blocks silent conversions that might otherwise succeed.
Character set mismatch when inserting or selecting incompatible text.
String cannot be converted to DATE or DATETIME.
Occurs in date functions when argument format is wrong.
Strict mode makes the error more common, but it can also appear in permissive modes when the server cannot safely convert the argument.
Implicit conversion works for compatible types, but relying on it risks unexpected truncation and future failures.
The %s placeholder in the error message shows the argument index in one-based numbering, helping you locate the offending value quickly.
Galaxy suggests safe CAST operations and offers inline fixes, but you review and apply the change before execution.
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