SELECT requiredId, <all_the_other_fields> from (
SELECT t2.someId AS requiredId
-- ...other data mainly from t2
FROM DataTable1 AS t1
LEFT JOIN DataTable2 AS t2
ON t2.OtherId = t1.ExperienceId
AND t2.LanguageId =
(SELECT TOP 1 t1.LanguageId
ORDER BY t1.LanguageId)
) group by requiredId, <all_the_other_fields>
甚至根本不提取列？
SELECT distinct t2.someId AS requiredId
-- ...other data mainly from t2 BUT not the Language id
FROM DataTable1 AS t1
LEFT JOIN DataTable2 AS t2
ON t2.OtherId = t1.ExperienceId
AND t2.LanguageId =
(SELECT TOP 1 t1.LanguageId
ORDER BY t1.LanguageId)
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