duplicate annihilator

The data de-duplication technology can provide more backup capacity, achieve longer data retention, maintain continuous verification of backup data, improve the level of data recovery service, and facilitate data disaster tolerance. Duplicate data may have two scenarios, the first one being only some of the fields in the table, and the second is exactly the same as two rows of records. The Oracle Database De-duplication technology has the following ad

Method OneDeclare @max integer,@id integer DeclareCur_rowscursorLocal for SelectMain field,Count(*) fromTable nameGroup byMain field having Count(*)> 1 Opencur_rowsFetchCur_rows into @id,@max while @ @fetch_status=0 begin Select @max = @max -1 Set RowCount @max Delete fromTable namewhereMain field= @id FetchCur_rows into @id,@max End Closecur_rowsSet RowCount 0 Method TwoThere are two meanings of duplicate records, one is a completely

Label: Introduction This article mainly introduces the method to avoid inserting duplicate values when inserting data into a table, mainly involves Ignore,on DUPLICATE key update,replace, and then we will take a look at the three ways to deal with them separately. IGNORE Use Ignore to automatically ignore duplicate record rows when the inserted value encounters

During normal development, we often encounter repeated data in data tables. How can this problem be solved? Here we will introduce the data deduplication methods in two cases: 1. Completely duplicate data deduplication; 2. Partial field data deduplication. I. Completely duplicate data deduplication Method You can use the following SQL statement to deduplicate data in a table. Code CREATETABLE "# temp" AS (S

1. Search for redundant duplicate records in the Table. duplicate records are determined based on a single field (peopleId ).Copy codeThe Code is as follows:Select * from peopleWhere peopleId in (select peopleId from people group by peopleId having count (PeopleId)> 1)2. Delete unnecessary duplicate records in the Table. Repeat records are determined based on a s

Seven examples of the uniq command: the uniq command in Linux can be used to process repeated lines in text files, this tutorial explains some of the most common usage of the uniq command, which may be helpful to you. The following File test will be used as the test file... seven examples of the uniq command: the uniq command in Linux can be used to process repeated lines in text files, this tutorial explains some of the most common usage of the uniq command, which may be helpful to you. The fol

If on duplicate key update is specified at the end of the INSERT statement, and DUPLICATE values appear in a UNIQUE index or primary key after the row is inserted, the old row UPDATE is executed; if the unique value column is not duplicate, a new row is inserted. For example, if column a is defined as UNIQUE and contains a value of 1, the following two statements

We may often encounter such an error during our code writing:：analyze the cause of the errorRead the cause of the error carefully to find a few key words: "Duplicate" and "symbols".The Chinese meaning of duplicate is "duplicated and duplicated", while symbols means "symbol". That is, it is possible to introduce repetitive things into your project.Problem-solving approachI summed up, there are three kinds of

In Excel, we usually do a lot of data is dense, to find their own repeated data, will certainly be confused, what is the better way to find the data table in the Excel duplicate data? Yes, let's see. Marks the repeating data for the worksheet in the following illustration. As shown in the figure: Data tables 1. First open the EXCEL2007 worksheet, select the range of cells that may have duplicate