Sql server 如何从两列的并集中获取前1个值？

这是查询，如何从结果中选择前1名？这是针对SQL Server的

SELECT column1 
FROM table 
WHERE column2 = 'Whatever' AND column3 = 'Sure'

UNION

SELECT column4 
FROM table 
WHERE column2 = 'Whatever' AND column3 = 'Sure'

尝试：

你是说

SELECT TOP 1 * 
FROM (
    SELECT column1 FROM table WHERE column2 = 'Whatever' AND column3 = 'Sure'
    UNION
    SELECT column4 FROM table WHERE column2 = 'Whatever' AND column3 = 'Sure')

试试这个：

SELECT TOP 1 * FROM
(
  SELECT column1 FROM table WHERE column2 = 'Whatever' AND column3 = 'Sure'
  UNION
  SELECT column4 FROM table WHERE column2 = 'Whatever' AND column3 = 'Sure'
) R
ORDER BY Column1

SELECT TOP 1 * FROM
(
  SELECT column1 FROM table WHERE column2 = 'Whatever' AND column3 = 'Sure'
  UNION
  SELECT column4 FROM table WHERE column2 = 'Whatever' AND column3 = 'Sure'
) R
ORDER BY Column1