<p>MySQL throws error 1769 when a SET statement tries to call a stored function, which is disallowed for safety and determinism reasons.</p>
<p>MySQL Error 1769: ER_SET_STATEMENT_CANNOT_INVOKE_FUNCTION appears when a SET statement attempts to execute a stored function. Replace the SET call with SELECT or assign the function result to a user variable outside the SET statement to resolve the issue.</p>
The statement 'SET %s' cannot invoke a stored function.
Error 1769 occurs when a SET statement tries to run a stored function. MySQL blocks this pattern because a function might cause side effects or recursion, disrupting deterministic behavior of SET.
The server returns: The statement 'SET %s' cannot invoke a stored function. It halts execution immediately.
The error surfaces in MySQL 5.7 and later whenever a SET session or global variable statement embeds a function call, for example: SET @x = my_calc();.
It also appears in triggers, events, and prepared statements that internally build such SET commands.
Leaving the problem unaddressed stops scripts, ETL jobs, and application logic. Production outages, delayed reports, and failed deployments often trace back to this simple misuse.
Misunderstanding of SET syntax, attempting to initialize variables inline, or porting code from other databases typically trigger it.
Server configuration has no toggle; the behavior is hard coded for consistency.
Move the function call outside the SET statement or switch to SELECT INTO. Assign user variables separately, or rewrite logic inside the function.
Always test the fix in a development environment before pushing to production.
Application startup scripts, migration tools, and legacy stored procedures often need minor rewrites. Replace SET @var = func(); with SELECT func() INTO @var;.
If setting a system variable, calculate the value first, store it in a user variable, then pass that user variable to SET.
Review code for SET plus parentheses patterns during code review. Use linting tools in Galaxy to flag violations before deployment.
Keep business logic inside stored procedures instead of SET. Prefer deterministic assignments.
Errors 1336 and 1415 appear when functions are misused in triggers or create cyclic dependencies. The root fix is similar: refactor the call pattern.
Using SET @v = my_func() directly invokes a function and triggers the error.
PL/pgSQL and T-SQL allow variable assignment with functions, confusing developers who switch to MySQL.
Building SET statements as strings that later include a function call leads to runtime failure.
Developers sometimes try to set @@global or @@session variables with a computed value coming from a function.
Occurs when a trigger calls a function that modifies data. Solution: move logic to procedure.
Raised when a function attempts SELECT without INTO. Rewrite as procedure or use SELECT … INTO.
Happens when function tries to modify the same table. Use procedure instead.
No. MySQL explicitly forbids invoking functions in any SET statement. Use SELECT INTO or separate assignments.
Error 1769 appears in 5.7 and all newer versions, including 8.0. It is not configurable.
No. sql_mode settings do not influence this restriction. Code refactor is required.
Galaxy's linter flags SET statements containing parentheses and suggests the SELECT INTO rewrite before code reaches production.
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