您必须使用ORDER BY子句指定订单。在您的示例中，您可以执行以下操作：
SELECT 1 AS seq, COUNT(datediff(yyyy,dob,admitdate) as counts
FROM myTable
WHERE ...condition-1...
UNION
SELECT 2 AS seq, COUNT(datediff(yyyy,dob,admitdate) as counts
FROM myTable
WHERE ...condition-2...
ORDER BY seq
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