Error 1308 occurs when a LEAVE or ITERATE statement references a loop label that does not exist or is misspelled in a MySQL stored program.
MySQL Error 1308: ER_SP_LILABEL_MISMATCH appears when a LEAVE or ITERATE statement cannot find a matching loop label. Correct the label name or add the missing label to resolve the problem.
%s with no matching label: %s
MySQL raises error 1308 when a flow-control statement references a label that the parser cannot find in the current block scope. The message format is “%s with no matching label: %s”.
This compilation error stops the creation or execution of a stored procedure, function, or trigger. Fixing it is critical because the routine will not compile, leaving dependent application logic broken.
Using LEAVE or ITERATE with a typo or different casing than the opening LOOP label triggers the mismatch. Labels are case-sensitive.
Nesting loops without unique label names can confuse the parser, producing the same error even when the text matches.
Copy-pasting code between procedures can leave obsolete LEAVE statements that reference a label removed earlier.
Verify that every LEAVE or ITERATE exactly matches an existing label defined with LOOP, REPEAT, WHILE, or BEGIN … END. Labels must be unique inside the routine.
Rename duplicate labels to keep scopes clear. Always end the LOOP with the same label that started it.
Typo in label - correct spelling or casing in LEAVE/ITERATE.
Removed loop - delete orphan LEAVE statements left behind.
Nesting confusion - give each nested loop a distinct label such as outer_loop, inner_loop.
Adopt a naming convention like loop_name_start and loop_name_end to keep labels obvious.
Run stored procedure unit tests in Galaxy’s SQL editor to catch compilation errors early.
Enable code review so teammates check label consistency before deploying.
MySQL 1307 ER_SP_LABEL_MISMATCH - similar mismatch but for BEGIN … END blocks. Fix by aligning labels.
MySQL 1338 ER_SP_UNDECLARED_VAR - undeclared variable inside routine. Declare variables before use.
A single character difference causes MySQL to report no matching label.
Labels are compared case-sensitively, so LEAVE Foo does not match LOOP foo.
Leaving LEAVE statements after deleting a loop block makes them orphaned.
Using the same label name twice confuses the parser about which loop to exit.
Raised when an END label does not match a BEGIN label inside stored routines.
Occurs when a variable is referenced before declaration in a stored program.
Returned when a CASE statement lacks a matching WHEN branch and no ELSE clause.
Yes. foo and FOO are different labels. Always use identical casing.
No. Each label must be unique within the routine to avoid ambiguity.
No. Error 1308 is independent of SQL_MODE settings.
Galaxy’s IDE autocompletes label names and highlights undefined references, catching mismatches before execution.
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