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我在我的表上创建了一个复合唯一索引：

CREATE TABLE [dbo].[SearchIndexWord](
    [ID] [int] IDENTITY(1,1) NOT NULL,
    [CatalogID] [int] NOT NULL,
    [Word] [nvarchar](100) NOT NULL,
CONSTRAINT [PK_SearchIndexWord] PRIMARY KEY CLUSTERED 
(
    [ID] ASC
) 
WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) 
ON [PRIMARY]

CREATE UNIQUE NONCLUSTERED INDEX [IX_SearchIndexWord] ON [dbo].[SearchIndexWord] 
(
    [Word] ASC,
    [CatalogID] ASC
)
WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, SORT_IN_TEMPDB = OFF, IGNORE_DUP_KEY = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) 
ON [PRIMARY]

整个数据库的排序规则设置为 SQL_Latin1_General_CP1_CI_AS。当我运行以下 T-SQL 时，它会打印“不等于”：

IF 'm3/h' = 'm³/h'
    PRINT 'Equals'
ELSE
    PRINT 'Does not equal'

然后，如果我尝试以下插入语句：

INSERT INTO [SearchIndexWord] (Word, CatalogID) VALUES ('m3/h', 1), ('m³/h', 1)

我收到以下错误消息：

Msg 2601, Level 14, State 1, Line 1
Cannot insert duplicate key row in object 'dbo.SearchIndexWord' with unique index 'IX_SearchIndexWord'.

为什么是这样？我在文档中找不到它，但我假设使用配置的排序规则检查两个键重复的条件。

顺便检查了表、列和索引排序规则，它们都等于数据库排序规则。

4

1 回答 1

1

试试这个：

IF CAST('m3/h' AS NVARCHAR(100)) = CAST('m³/h' AS NVARCHAR(100))
    PRINT 'Equals' 
ELSE 
    PRINT 'Does not equal'

对我来说，这返回'Equals'解释了为什么您会收到重复键行错误。

我怀疑代码IF 'm3/h' = 'm³/h'中的值是作为 VARCHAR 创建的。

于 2010-08-18T05:45:04.730 回答