我在桌子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“不相等”:
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'.
这是为什么?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。
我顺便检查了表,列和索引排序规则,它们都等于数据库排序规则。
答案 0 :(得分: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,这会返回'Equals'
,这就解释了为什么会出现重复的键行错误。
我怀疑代码IF 'm3/h' = 'm³/h'
中的值是作为VARCHAR创建的。