The error appears when a stored program ends a labeled block with a different label name than it began with, breaking control-flow syntax.
MySQL Error 1310: ER_SP_LABEL_MISMATCH occurs when a LOOP, BEGIN, WHILE, or REPEAT block finishes with an END label that does not match its starting label. Align the END label with the opening label or remove labels entirely to resolve the error.
End-label %s without match
Error 1310 fires when MySQL parses a stored procedure, function, trigger, or event and finds an END label that does not match the label used at the block’s start.
The parser treats this as invalid control-flow syntax and stops execution.
The message “End-label %s without match” pinpoints the mismatched identifier, helping you locate the faulty END statement.
Developers usually add labels to nested BEGIN…END or LOOP structures for clarity, but forget to keep them consistent. Typographical errors, case mismatches, and copy-pasted code snippets are the top triggers.
The problem can also surface after refactors that rename only one side of a labeled pair.
MySQL requires labels to be unique within a stored program and to match exactly— including letter case— at both the start and end of a block.
Identify the opening label and ensure the END statement repeats it exactly. If labels are unnecessary, remove them to simplify the code.
When multiple nested labels exist, walk outward from the innermost block, confirming each pair.
After editing, recompile the stored routine with CREATE OR REPLACE or ALTER PROCEDURE to validate the fix.
Scenario 1 – Misspelled END label: Correct the typo so BEGIN my_loop … END my_loop;.
Scenario 2 – Case mismatch: Change END MY_LOOP; to END my_loop; because MySQL label comparison is case-sensitive unless the server is running in lower_case_table_names = 2 on Windows.
Scenario 3 – Removed opening label: Delete the END label or restore the opening label.
Use labels only when you need LEAVE or ITERATE statements. Adopt a naming convention such as prefixing loop_ or blk_ to labels.
Validate stored programs in a version-controlled environment like Galaxy before shipping to production.
Enable code reviews and automated linting to catch mismatched labels early. Galaxy’s AI copilot flags control-flow issues in real time, preventing bad routines from reaching production.
Error 1337: ER_LABEL_REDEFINED signals duplicate labels in the same program. Error 1338: ER_LABEL_MISMATCH reports LEAVE or ITERATE referencing an undefined label. The debugging approach mirrors Error 1310— verify label uniqueness and spelling.
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No. Use labels only when LEAVE or ITERATE statements must target a specific block.
Yes. MySQL compares labels exactly, so BEGIN myLoop differs from END MYLOOP.
No. The parser enforces label pairing at compile time to guarantee control-flow integrity.
Galaxy’s AI copilot validates control-flow structures in real time and highlights mismatched labels before the code is executed.
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