报错:Update row with Key (id)=(xxxx) multiple times或者duplicate key value violates unique constraint 问题原因:违反唯一性约束,执行UPDATE、INSERT ON CONFLICT或INSERT操作时,主键存在重复数据。 解决方法: 若INSERT语法报错:可以改为INSERT INTO xx ON CONFLICT的语法,实现主键去重,详情请参见INSERT ON CONFLIC...
(max) NULL, CONSTRAINT [PK_School.Student] PRIMARY KEY CLUSTERED ( [PersonID] ASC )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY] GO SET ANSI_NULLS ON GO...
sys.dm_db_missing_index_columns(index_handle) sys.dm_db_missing_index_details 1. 2. 3. 4. 5. 6. 7. 8. 9. 关于这些个DMV的使用,来举一个例子: --新建表,建立主键,形成聚集索引 CREATE TABLE BigTable ( [KEY] INT, DATA INT, PAD CHAR(200), CONSTRAINT [PK1] PRIMARY KEY ([KEY]) ...
That would allow the constraint applied to an address row to vary based on the country for that row. In databases that store data on behalf of clients, there is typically already a table representing a client. That table can be used to store grouping patterns that let you describe the way...
If a run-time statement error (such as a constraint violation) occurs in a batch, the default behavior in the Database Engine is to roll back only the statement that generated the error. You can change this behavior using the SET XACT_ABORT ON statement. After SET XACT_ABORT ON is execu...
When you create a PRIMARY KEY constraint, a unique index on the column, or columns, is automatically created. By default, this index is clustered; however, you can specify a nonclustered index when you create the constraint. Can be used in range queries. If the clustered index is...
Drop and Create Constraint on Very Large Table Drop and recreate table in stored procedure Drop Database Error Msg 3701, Level 11, State 1, Line 1 Drop or Truncate a particular partition. DROP Table - How to force a delete of a table when constraints are missing? DROP TABLE does not see...
ALTER TABLE statement conflicted with the FOREIGN KEY constraint Alternative to using multiple REPLACE statements AlwaysUseDefaultCodePage: Can I change the default to True? An error occurred during local report processing. (Microsoft.ReportViewer.WinForms) An error occurred in the requested FTP operatio...
sys.dm_db_missing_index_details 关于这些个DMV的使用,来举一个例子: --新建表,建立主键,形成聚集索引 CREATE TABLE BigTable ( [KEY] INT, DATA INT, PAD CHAR(200), CONSTRAINT [PK1] PRIMARY KEY ([KEY]) ) GO--批量插入测试数据250000行 ...
i.is_unique_constraint as [是否外键], STUFF(REPLACE(REPLACE(( SELECT QUOTENAME(c.name) + CASE WHEN ic.is_descending_key = 1 THEN ' DESC' ELSE '' END AS [data()] FROM sys.index_columns AS ic INNER JOIN sys.columns AS c ON ic.object_id = c.object_id AND ic.column_id = c....