When a statement returns an error with a severity higher than the value specified for the error level (ERRLVL) parameter of the RUNSQLSTM command, the statement has failed.
The rest of the statements in the source are
parsed to check for syntax errors, and will not be run. Most SQL errors have
a severity of 30. If you want to continue processing after an SQL statement
fails, set the ERRLVL parameter of the RUNSQLSTM command to 30 or higher.
DROP statements issue a severity level 20 error if the object is not found
to be dropped. Setting the ERRLVL parameter to have a value of 20 allows
you to ignore these errors for DROP statements while not allowing processing
to continue for other higher severity errors.