The SQL Server Data row cannot delete or copy the table structure.

In SQL Server, all rows of data are duplicated and cannot be updated or deleted. The problem is usually the table without a primary key. Error: Check whether the table has a primary key. If not, you have

In SQL server, all rows of data are duplicated and cannot be updated or deleted. The problem is usually the table without a primary key. Error: Check whether the table has a primary key. If not, you have

The SQL Server Data row cannot delete or copy the table structure.

[Date:] Source: Linux community Author: cjr15233851143 [Font:]

The following are the two problems I encountered when working on the system:

<1>. SQL server has duplicate rows of data and cannot be updated or deleted.

It is usually a table without a primary key.

Error:

Check whether the table has a primary key. If not, use a temporary table to delete duplicate rows.

Example:

Method 1:

Delete from tab_test2 where id = (select max (id) from tab_test2 group by id, uid having count (1)> 1)

Method 2: Note: # t is a temporary table, which can be found under the temporary table node in the tempdb database and will disappear after the SQL Server service is restarted.

Select id, uid into # t from tab_Test2 group by id, uid

Truncate table tab_Test2

Insert into tab_Test2 select * from # t

<2>.Copy the structure of other tables to a specified table.

For example:

There are three tables as follows::

Consider the following question: is the specified table empty?