how to update millions of records in sql server

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 records and keep only one of them. In

Example:Table stuinfo, which has three fields: recno (auto-increment), stuid, and stuname The SQL statement used to create the table is as follows: Create Table [stuinfo] ( [Recno] [int] identity (1, 1) not null, [Stuid] [varchar] (10) Collate chinese_prc_ci_as not null, [Stuname] [varchar] (10) Collate chinese_prc_ci_as not null ) On [primary] Go 1. Check the repeated values of one or more columns.(Only the value of the reco

redundant duplicate records in the table (multiple fields) The code is as follows:Copy code Select * from vitae a where (a. peopleId, a. seq) in (select peopleId, seq from vitae group by peopleId, seq having count (*)> 1) 4. Delete redundant record (multiple fields) in the table, leaving only the records with the smallest rowidDelete repeated records (multi

--discontinuous and sequential records2 Select * 3 from [t_idnotcontinuous_temp]4 whereIdnew_id- 15 6 7 --querying original Records8 SelectA.* from [t_idnotcontinuous] asa9 Inner Join(Select * Ten from [t_idnotcontinuous_temp] One whereIdnew_id- 1) asb A ona.ID>=b.ID anda.IDb.new_id - Order bya.ID(Figure 3: effects)Supplement 1: If this ID field is not a primary key, then there will be duplicate ID values (there may be some misoperation, have encountered before) then you need to handle t

A few days ago, I read the article in the SQL section of SCID and explained how to quickly delete duplicate records in SQL Server. I browsed it. The author used four methods: creating temporary tables, using cursors, and using unique indexes. After a while, I found that the method I used was the easiest. Good stuff can

Tags: style blog http color ar os SP data divOriginal: SQL Server group Query the time difference between two adjacent recordsFirst, we use two records from the table in the database to elicit problems, such asThese are the table data for a record operation record. OrderID is the self-growing column, followed by operation type, operation time, operator.The proble

today's article, I want to give you a brief introduction to how the random Recordset is in SQL Server. 1 SELECT * from Person.person 2 ORDER by NEWID ()3GOthis introduces the new uniqueidentifier data type column, which SQL Server will perform physically on that column. However, the column itself is not returned in t

SQL Server queries the average value of records and sorted statements to query the average score of students and rank them. sql2000 uses subqueries to complete the query. When the average score is repeated, the ranking vacancy and the ranking vacancy are retained. Selectt1. *, px (selectcount (1) from ( nbsp; selectm. S # [student ID], nbsp; nbs

The number of records in the SQL server computing table, the current auto-increment value, and the occupied space are not SELECTTableNameobj. name, TotalRowsprt. rows, Identity_CurrentIDENT_CURRENT (obj. name), [SpaceUsed (KB)] SUM (alloc. used_pages) * 8FROMsys. objectsobjJOINsys. indexesidxonobj. object_idi No SELECTTableName = obj. name, TotalRows = prt. rows,

time.fields, which must have the same ID and name, are excludedLet's change the query statement:Select ID, distinct name from tableUnfortunately, in addition to the error message you get nothing, distinct must be placed at the beginning. Is it difficult to put distinct in a where condition? Can, still error.--------------------------------------------------------The following methods are possible:SELECT *, COUNT (distinct name) from the table group by nameResults:ID Name count (distinct name)1

In our daily operations, we have to insert multiple records to a table in the database at a time, but the first thought is to copy and paste n multiple repeated insert into statements, in case an error occurs when a semicolon or multiple Commas are missing, it will be a waste of time and work.In addition to the method mentioned above, there are actually two methods, which are simpler than the previous one.The first is the previous method: Inse

Based on Spring Boot, use JPA to call the stored procedures of the SQL Server database and return a set of records. springjpa In the previous article "using Spring Boot and JPA to operate SQL Server database to complete CRUD", we completed the CRUD operation on Object Data U

duplicate record, the operation method is as followsSuppose there is a duplicate field name,address, which requires the result set to be unique for both fields1 --inserts all records from TableName into the temporary table #tmp and increments the line number field2 Select Identity(int,1,1) asAutoid,* into#Tmp fromTableName3 --Insert no duplicate records from temporary table #tmp into the temporary tabl

First of all, I need to emphasize that this article aims to reveal the principle of recovering the deletion records of heap tables. What I have considered does not apply to every situation of everyone. I hope you will forgive me ~Many friends think that in simple mode, the heap table cannot retrieve a record because there is no log record. In fact, in a sense, it can be recovered, because the heap table only changes the row offset when deleting

Source: Querying SQL Records executed by SQL ServerSometimes, you need to know what SQL Server executes, and you can use the following method:SELECT TOP 1000--Creation timeQs.creation_time,--Query statementsSUBSTRING (St.text, (QS.STATEMENT_START_OFFSET/2) +1,(Case Qs.statem

Problem There is a lot of data that needs to be dug inside the Microsoft SQL Server System view. This data is used to present information to the end users of SQL Server Management Studio and to Third-party management tools available to SQL

I have two systems, one for the database is SqlServer2008 and the other for MySQL. Now I need to synchronize the content updated on SQL Server to MySQL and update the corresponding MySQL fields. I hope you can help me solve this problem. Thank you! I have two systems: SQL Server