MySQL raises ER_SP_LABEL_MISMATCH when an END label inside a stored routine does not correspond to any opened BEGIN or control-flow label.
MySQL Error 1310: ER_SP_LABEL_MISMATCH occurs when an END label in a stored procedure or trigger does not match a previously declared label. Rename the END label or add the missing BEGIN/LOOP/REPEAT label to resolve the mismatch.
End-label %s without match
Error 1310 appears with the message "End-label without match" when MySQL compiles a stored procedure, trigger, function, or event.
The parser expected a matching BEGIN, LOOP, REPEAT, WHILE, CASE, or IF label but could not find one, so compilation stops and the routine is not created or altered.
Mismatched BEGIN and END labels are the primary cause. MySQL requires the BEGIN and END parts of a labeled block to share the exact identifier, including letter case.
Nested blocks that reuse a parent label or forget to close an inner label will also trigger the error during parsing.
First, locate every labeled BEGIN/LOOP/REPEAT statement and verify a matching END label exists. Correct typos and ensure unique labels per nesting level.
After updating labels, recompile the routine with CREATE OR REPLACE or ALTER PROCEDURE. MySQL will accept the statement once all labels align.
Typos such as BEGIN label_a ... END label_b cause immediate failure. Rename END label_b to END label_a.
Copy-pasted loops often inherit labels that conflict with siblings. Give each loop a unique, descriptive label to avoid collision.
Adopt a clear naming convention like blk_, loop_, or sp_ prefixes and enforce case consistency. Reserve labels only for complex nested logic.
Use Galaxy’s real-time linting to highlight unmatched labels as you type, preventing compilation errors before running the script.
Error 1324 (ER_SP_BADRETURN) arises when RETURN appears outside stored functions. Similar logic checks can help avoid both errors.
Error 1334 (ER_SP_UNDECLARED_VAR) warns about undeclared variables; refactoring labels and variables together keeps routines readable and error-free.
END label spelling or case differs from its corresponding BEGIN label.
An END label exists, but the opening label was removed or never created.
Inner and outer blocks share a label name, confusing the parser when END appears.
Code reused from another routine keeps old labels that are not defined in the new context.
Raised when a RETURN statement is used outside of a stored function.
Occurs if you reference a variable that has not been declared in the current scope.
Generic parser error that can also result from label problems when MySQL cannot continue tokenizing the statement.
No. Label matching is enforced by the parser, and it cannot be disabled.
No. Unlabeled BEGIN ... END blocks do not require matching identifiers and therefore cannot raise 1310.
All maintained versions from 5.0 onward enforce label matching and will generate Error 1310 on mismatch.
Galaxy flags unmatched labels in real-time, offers AI refactoring to rename blocks consistently, and runs compilation checks before execution.
.avif)
.avif){kind=logo}
