排序与临时表冲突

Question

tempdb的排序规则为Latin1_General_100_CI_AI。数据库的排序规则也是Latin1_General_100_CI_AI。然而，以下SQL语句：

SELECT *
FROM ##CitiesMapping AS cm
INNER JOIN Cities ON cm.CityName=Cities.Name

返回：

Cannot resolve the collation conflict between "SQL_Latin1_General_CP1_CI_AS" and "Latin1_General_100_CI_AI" in the equal to operation.

服务器默认排序规则也是Latin1_General_100_CI_AI

Answer 1

检查所涉及的表格：

SELECT name, collation_name, OBJECT_NAME(object_id)
FROM sys.columns 
WHERE OBJECT_NAME(object_id) IN ('Cities')

Answer 2

对于单个列，可能会对排序规则设置不同。斯图尔特的询问会告诉你。如果它们是不同的排序规则，您可以指定比较任一侧使用的排序规则，如下所示：

SELECT *
  FROM ##CitiesMapping AS cm
 INNER JOIN Cities 
    ON cm.CityName COLLATE DATABASE_DEFAULT = Cities.Name COLLATE DATABASE_DEFAULT;

我希望这可以帮助你。