Error
Error Code:
1204
MySQL Error 1204: SET Requires Constant Expressions
Description
Error 1204 occurs when you attempt to assign a non-constant value, such as a variable, expression, or function result, to a system variable using the `SET` statement. MySQL expects only literal, constant expressions (e.g., numbers, strings, boolean values) when modifying these variables.
Error Message
You may only use constant expressions with SET
Known Causes
3 known causesAssigning a Variable to a System Variable
Attempting to set a system variable (e.g., `@@session.sql_mode`) using the value stored in another user-defined variable or a session variable.
Using Expressions or Function Calls
Providing an arithmetic expression, a concatenation, or the result of a function call as the value for a system variable in a `SET` statement.
Incorrect Dynamic Value Assignment
Trying to dynamically derive a value for a system variable from a subquery or other non-literal source within the `SET` statement itself.
Solutions
Coming SoonDetailed step-by-step solutions for this error are being prepared. In the meantime, try these general troubleshooting tips:
General Troubleshooting Tips
- Check the error message carefully for specific details
- Review recent changes that might have caused the error
- Search for the exact error code in the official documentation
- Check log files for additional context
- Try restarting the application or service