For some source code, ? is used to define external parameters, therefore to enable unique referencing, the SQL Scanner adds a number so that each parameter has a unique name within the SQL statement.
For example:
SELECT EMP_ID
FROM EMPLOYEE
WHERE EMP_ID = ?
AND EMP_NAME = ?
SELECT EMP_ID
FROM EMPLOYEE
WHERE EMP_ID = ?1
AND EMP_NAME = ?2
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