您没有指定要如何处理关系，但是如果要显示重复项，将这样做。
SELECT a.* FROM MyTable a
LEFT JOIN MyTable b
ON a.userid=b.userid
AND CAST(a.version AS INT) < CAST(b.version AS INT)
WHERE b.version IS NULL
如果您要消除重复项，并且如果存在重复项，请选择最新的重复项，则必须对查询进行某种程度的扩展；
WITH cte AS (SELECT *, CAST(version AS INT) num_version FROM MyTable)
SELECT a.id, a.userid, a.version, a.datetime
FROM cte a LEFT JOIN cte b
ON a.userid=b.userid
AND (a.num_version < b.num_version OR
(a.num_version = b.num_version AND a.[datetime]<b.[datetime]))
WHERE b.version IS NULL
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