how to update millions of records in sql server

When we want to count the total number of records in a datasheet, we use the T-SQL function count (*). If this function is executed in a large table containing millions of rows, it can take a long time to return the total number of records in the entire table, which results in a decrease in query performance. First, t

total number of records of a table at a very high speed, which can be completed in milliseconds, Which is tens of thousands of times faster than select count, however, when using this method, you must make sure that the total number of records in the table obtained by this method is not an exact value because ms SQL does not

To explain the SQL Server Transaction log records, we all know that in the full recovery mode, SQL server records the operations performed by each firm and these records are stored in t

The SQL SERVER database table records are retained for only N days. This article shows you how to keep the SQL SERVER database table records for only N days. For detailed steps, see the following: Step 1: first set the

Empty records in all data tables in SQL Server To empty records in all data tables: Copy Code code as follows: exec sp_msforeachtable @Command1 = ' truncate table? ' Delete all data tables: Copy Code code as follows: exec sp_msforeachtable ' delete N '? ' Methods for emptying

Emptying records from all data tables in SQL ServerClear all records in the data table:The code is as follows: exec sp_msforeachtable @Command1 = ' truncate table? 'Delete all data tables:The code is as follows: Exec sp_msforeachtable ' delete N '? 'Method of emptying all table data in a SQL

Label:1. A transport-level error occurred while sending a request to the serverA transport-level error occurred while sending a request to the server. (PROVIDER:TCP provider, error:0-the remote host forced the shutdown of an existing connection.) )---> System.Data.SqlClient.SqlException: A Transport-level error occurred while sending the request to the server.Started to think that it was a problem with the network connection, and finally found that th

SQL Server queries 31 to 40 records in the table, and writes an SQL statement to output 31 to 40 records in the UserInfo table in case of discontinuous IDS (the database is SQL Server,

As long as interaction is involved, it will certainly deal with data. Maybe there is not much such content on the Internet, no matter how many, each summary is experience-based, and is carefully prepared. As long as interaction is involved, it will certainly deal with data. Maybe there is not much such content on the Internet, no matter how many, each summary is experience-based, and is carefully prepared. As long as interaction is involved, it will certainly deal with data. Maybe there is

look at the dirty data to see if there is a modification to this page:The modified PageID from the memory above is 152, not the Page78 of the table T.From this we can assume that SQL Server does not actually make an update operation that is the same as the original value.6. If we update a few of the same operations as

: select * from ta left join tb on ta.id=tb.id where tb.id is null Shows the query result: However, we found that the above query results have two columns, namely the join query results of table A and Table B, but we only need the content in Table A, so we can slightly modify the above query: select ta.* from ta left join tb on ta.id=tb.id where tb.id is null Shows the query result: The above are the query results we require.Detailed description (PS: 2012-9-7) data preparation view code Use T

Label:SQL Server: Bulk Delete table via sys.tables, or roll back table 1 beginTry2 Drop Table#temp103 EndTry4 beginCatch5 EndCatch6 7 Select 'drop/*truncate*/table tuning.'+Name asDroptable,row_number () Over(Order byName asRowNumber8 into#temp109 fromSys.tableswhereName like 'member%' andSchema_name (schema_id)='dbo' Ten One Select * from#temp10 A - Declare @rownumber int; - Declare @records