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SELECT 'XXX' AS COL_B, 'YYY' AS COL_C INTO tab UNION ALL SELECT NULL, 'AAA' UNION ALL SELECT 'BBB', NULL
3 rows affected
SELECT COL_B, COL_C, CONCAT_WS(' - ', COL_B, COL_C) AS [B] FROM tab
COL_B
COL_C
B
XXX
YYY
XXX - YYY
null
AAA
AAA
BBB
null
BBB