how to update millions of records in sql server

In general, update a table, using the WHERE statement: Copy Code code as follows: UPDATE Ttest SET Statusind = ' ACTIVE ' WHERE ID = 123 Attention: The table name after the UPDATE statement, which is not enabled for aliases.So the ID field at this point is from the TTest table (understandable) However, if

INNER JOIN dbo.sysobjects D on a.id = d.id and D.xtype = ' U ' and D.name "+ TableName +@"' and A.name= '"+ FieldName +@"'", connection)) { varRET =cmd. ExecuteScalar (); if(ret = =NULL) return NULL; returnret. ToString (); } } Private BOOLAddfielddescription (SqlConnection connection,stringTableName,strin

Label:Now, I have two tables, one s_person,s_user.S_personS_userI want to change the account in S_user form to S_person account in bulk now.We can see that there is a field in the S_user table that is associated with the S_person table. That's person_id, and that's what we're going to update.When we find this relationship, we won't be hard to write SQL.Update S_user set account=p.account from S_person p where p.id=s_user.person_id;I'm sorry, the chart will be back tomorrow.batch

A SQL Server operation, such asThere is no problem with this.Two MySQL operations such asBut in MySQL I wanted to implement this function, but it went wrong.It turns out that MySQL does not support sub-queriesWe can make this change so we can do it.See no, I just add a layer in the query outside, but realized.The code is as follows:Create PROCEDURETESTP (inch_idint)begin --Set @tt = (select id from UserA w

The new Xml.modify () method is added to SQL Server, xml.modify (insert), xml.modify (delete), xml.modify (replace) to insert, delete, and modify the XML. This article takes the following XML as an example to illustrate three types of DML: Declare @XMLVar XML = ' ' 1.XML. Introduction to Modify (Insert) statement A. Inserting an element into a specified position using the as First,at last,before,after four