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SELECT 31321 AS loadId, 41421 AS Stop1, 1233 AS Stop2, NULL AS Stop3, NULL AS Stop4 INTO tab UNION ALL SELECT 1231, 13123, NULL, NULL, 12321
2 rows affected
 hidden batch(es)

SELECT *, CONCAT_WS('-', Stop1, Stop2, Stop3, Stop4) AS r FROM tab
loadId Stop1 Stop2 Stop3 Stop4 r
31321 41421 1233 41421-1233
1231 13123 12321 13123-12321
 hidden batch(es)