how to update millions of records in sql server

)) FROM Seq WHERE id Then we execute this stored procedure and insert the test data. SQL Server Management Studio records the operation time in the lower right corner of the output window. To be more intuitive, we manually wrote a statement that records the time, as shown below: DECLARE @ d datetimeSE

How to quickly delete duplicate records in SQL Server Developer nightmare-delete Repeated Records Presumably, every developer has had a similar experience. When querying or collecting statistics on the database, the query and statistics results may be inaccurate due to repeated

duplicate fields are Name and address. You must obtain the unique result set of the two fields.Select Identity (INT, 1, 1) as autoid, * into # TMP from tablenameSelect min (autoid) as autoid into # tmp2 from # TMP group by name, autoidSelect * from # TMP where autoid in (select autoid from # tmp2)The last SELECT command gets the result set with no duplicate name and address (but an autoid field is added, which can be omitted in the select clause when writing) 3. Some key fields are repeated an

Quickly delete duplicate records in SQL Server 2006-07-17 21:53:15Category: SQL Server 　　 Developer's Nightmare-delete duplicate recordsPresumably, every developer has had a similar experience, when querying or statistics of the database will occasionally encou

the bottleneck of SQL Server?Can't do that, is this the bottleneck of SQL Server? On the Internet to check the relevant information, may be the bottleneck of Io, and what can be done, to upgrade the server, to replace the database, but the project party? Wait, there seems t

the project requires the use of dual-machine hot standby, in order to save the hassle and reduce unnecessary trouble, we put the relevant services together so that we can take full advantage of HA features (externally purchased HA system) System data correctness requirements are extremely abnormal, requires from the bottom of the collection system to the top of the monitoring system, a data can not be poorOur system architecture is as follows, and we can see that the database pressure is ve

In SQL Server, apart from manual deletion of tables with more than a dozen records, deleting duplicate records usually involves writing a piece of code and performing a row-by-row check using the cursor method, delete duplicate records. Because this method needs to traverse

requires the use of dual-machine hot standby, in order to save the hassle and reduce unnecessary trouble, we put the relevant services together so that we can take full advantage of HA features (externally purchased HA system) System data correctness requirements are extremely abnormal, requires from the bottom of the collection system to the top of the monitoring system, a data can not be poorOur system architecture is as follows, and we can see that the database pressure is very large, es

Dtime>= "and dtime" set STATISTICS IO OFF The results are as follows:Better before the optimization?Looking closely at the IO data, we found that the pre-read is the same, that is, we want to query the data records are consistent, physical reading, table scanning is always. Logical reads, however, are slightly different and should be caused by cache hits. In other words, the conditional order of the WHERE clause does not optimize the query

The results are as follows:Better before the optimization?Looking closely at the IO data, we found that the pre-read is the same, that is, we want to query the data records are consistent, physical reading, table scanning is always. Logical reads, however, are slightly different and should be caused by cache hits. In other words, the conditional order of the WHERE clause does not optimize the query result without indexing .Then, you can onl

server| Repeat | Recurring nightmare for Developers--delete duplicate records Presumably every developer has had a similar experience, and when querying or counting the database, the query and statistic results are inaccurate due to duplicate records in the table. The solution to this problem is to delete the duplicate recor