sql-server - 与临时表的排序规则冲突

Question

tempdb 的排序规则是Latin1_General_100_CI_AI. 数据库的排序规则也是Latin1_General_100_CI_AI。然而下面的 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

score 3 · Accepted Answer

可能为单个列设置了不同的排序规则。来自 Stuart 的查询将向您展示这一点。如果它们是不同的排序规则，您可以指定在比较的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;

我希望这能够帮到你。

score 2 · Accepted Answer

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')

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