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How to avoid inserting duplicate records in sql server c#

How to avoid inserting duplicate records in sql server c#

This article shows how to identify duplicate records. Usually we use a primary key or unique key to prevent insertion of duplicate rows in SQL Server. But if we don't use them, then duplicate rows can be entered by the user. After inserting duplicate rows into a table, it becomes a major issue to identify those duplicate rows. So this topic will help us to identify those duplicate rows from the table in ASP. This table doesn't have a primary key identity column. The table looks as below. Now insert duplicate rows data into the table. First you have to create a web site. Now add the following namespaces. Now write the connection string to connect to the database. Now double-click on the first Button control and write the following code for binding the data with the first GridView. Fill dt. DataBind. In code-behind write the following code. Now run the application and test it. Now click on the Show data with DuplicateRows Button to show the data with duplicate rows. Now click on the Button ShowDuplicateRows to show only duplicate rows of the table. Some Helpful Resources. View All. Rohatash Kumar Updated date Mar 14, One is used to show the data with duplicate rows, the second one is used to show duplicate rows. Let's take a look at a practical example. SqlClient; using System. Code-behind using System; using System. Generic; using System. Linq; using System. Web; using System. UI; using System.

How to avoid inserting duplicate records in mysql

We should follow certain best practices while designing objects in SQL Server. For example, a table should have primary keys, identity columns, clustered and non-clustered indexes, constraints to ensure data integrity and performance. Even we follow the best practices, and we might face issues such as duplicate rows. We might also get these data in intermediate tables in data import, and we want to remove duplicate rows before actually inserting in the production tables. Suppose your SQL table contains duplicate rows and you want to remove those duplicate rows. Many times, we face these issues. It is a best practice as well to use the relevant keys, constrains to eliminate the possibility of duplicate rows however if we have duplicate rows already in the table. We need to follow specific methods to clean up duplicate data. This article explores the different methods to remove duplicate data from the SQL table. For example, execute the following query, and we get those records having occurrence greater than 1 in the Employee table. We require to keep a single row and remove the duplicate rows. We need to remove only duplicate rows from the table. For example, the EmpID 1 appears two times in the table. We want to remove only one occurrence of it. In the following screenshot, we can see that the above Select statement excludes the Max id of each duplicate row and we get only the minimum ID value. To remove this data, replace the first Select with the SQL delete statement as per the following query. Once you execute the delete statement, perform a select on an Employee table, and we get the following records that do not contain duplicate rows. It is available starting from SQL Server In the output, if any row has the value of [DuplicateCount] column greater than 1, it shows that it is a duplicate row. In the screenshot, you can note that we need to remove the row having Rank greater than one. SQL Server integration service provides various transformation, operators that help both administrators and developers in reducing manual effort and optimize the tasks. We can use a Sort operator to sort the values in a SQL table. You might ask how data sorting can remove duplicate rows? For the configuration of the Sort operator, double click on it and select the columns that contain duplicate values. We can also use the ascending or descending sorting types for the columns. The default sort method is ascending. In the sort order, we can choose the column sort order. Sort order 1 shows the column which will be sorted first. On the bottom left side, notice a checkbox Remove rows with duplicate sort values. It will do the task of removing duplicate rows for us from the source data. We can add SQL Server destinations to store the data after removing duplicate rows. We only want to check that sort operator is doing the task for us or not. To view the distinct data, right-click on the connector between Sort and Multicast. Click on Enable Data Viewer. Execute the package to perform SQL delete operation. It opens the Sort output data viewer at the Data flow task. In this data viewer, you can see distinct data after removing the duplicate values. You can use the method in which you feel comfortable.

How to avoid inserting duplicate records in sql php

You could use another table to bulk insert the file contents as they are with duplicatesand then select distinct rows to insert to your target table. I hope this is helpful, John. Sign in. United States English. Ask a question. Quick access. Search related threads. Remove From My Forums. Answered by:. Archived Forums. This is the place for advice and discussions 0 3. Sign in to vote. Hi All. I have a table which is being filled by a bulk insert statement from a file. The file may have duplicate records same value for all columns, not just primary key and i want to avoid this duplication in the table. Basically, want bulk insert to ignore the duplicates. I searched, but couldn't get a relevant option. Is there a way to make sure bulk insert doesn't ignores the duplicate records? Wednesday, May 6, PM. Then any duplicates bulk inserted will silently fail without generating an error. Your index key will, of course, have to contain all the columns you consider as being a "duplicate", not just the PK. If your unique index has the ignore option on, then yes it will ignore the third record and insert the remainder. Say if my file has. Are you saying that bulk insert will ignore record no 3 and will continue with rest of the file?

How to avoid duplicate records in sql select query

More actions. I have a company table for some reason I can't create a constraint on table level. I am trying to use the following Trigger on my table to avoid duplicate records. The constraint is the way to go. Tell us what you tried and why there is a problem so that we can help you get the constraint in place. If the answer to your question can be found with a brief Google search, please perform the search yourself, rather than expecting one of the SSC members to do it for you. Thanks Phil!! If I add new constraints it will blocking some existing system. I would like to insert only the unique CompanyName into Company Table. FOR triggers are executed after insert is done, so, it there is a constraint - it will raise the error before the trigger is executed. To me - it's duplicate as well, but it's OK according to your definitions above. Also, triggers are processed for the entire result set at once. You've set up your trigger to only process one row of the result set and discard the other rows. However, if the desire is to prevent such duplicates without firing an error, the trigger is probably the way to go. I do whatever I can to avoid triggers! I don't know if it will help in this case but you CAN write a unique index with an "Ignore Duplicates" attribute that will simply not insert duplicates and won't cause a failure if you try. However, that's not the right way to do such things. The right way is to have the index constraint fail and return the failure to the front end so that people on the front end know something is wrong instead of it simply continuing with a silent ignore. I'm a DBA so please give me patience because, if you give me strength, I'm going to need bail money too! You must be logged in to reply to this topic. Login to reply. June 29, at pm Go to Answer Hello, I have a company table for some reason I can't create a constraint on table level. MsgLevel 16, State 1, Line 12 The transaction ended in the trigger. The batch has been aborted. Phil Parkin. June 29, at pm Please explain this statement: I have a company table for some reason I can't create a constraint on table level The constraint is the way to go. June 30, at am Above one is the sample data and I don't want to insert the duplicate company name. CompanyName OR i. June 30, at pm June 30, at pm Answer Jeff Moden. Viewing 7 posts - 1 through 7 of 7 total.

How to avoid inserting duplicate records in sql server using trigger

How to avoid inserting duplicate records in sql server c#
In this tutorial, I explain the 5 quick ways to delete duplicate records from any database table. These ways must be known to every developer. When you are working with Database-Driven applications, you should definitely know how to remove duplicated records from your database table. Duplicate records not only take a massive amount of space but also make the database query execution process slower. Therefore, every developer should know how to delete duplicate records. I have decided to write this tutorial that tells 5 quick ways to delete duplicate records from a Database table. I hope you will enjoy reading and learning from it. This table looks like:. Note that the student with name Mary and Id 5 is not a duplicate of other Mary records id 6 and 7 because her standard is different than other Mary records. This query is. You can see in the above image that the students with id 3 and 7 are missing since they are the duplicate records. If you want to use Distinct Statement which returns Non-Duplicate rows then you will have to create a new table with an exact definition like your previous table. The below 2 queries do this work for me:. Self Join which is an Inner Join on the same table can also be used to remove duplicate records. Here you create the self-join by making use of 2 things which are given below. In this tutorial, you learned 5 quick ways to delete your duplicate records from a database table. You can choose any deletion method based on your liking. View All. Yogi S Updated date Jan 24, Now I add some duplicate records to this table by running the following insert scripts. The duplicate records are the students with the below names: Ram with id 2 and 3. Mary with id 6, 7. My Database table is ready, now let us start with 5 ways to delete duplicate records from this table:. Now, I can use the Delete statement in my query to delete these records.

How to prevent inserting duplicate records in sql server

This article discusses two different approaches available to remove duplicate rows from SQL table s which often becomes difficult over time as data grows if this is not done on time. The presence of duplicate rows is a common issue that SQL developers and testers face from time to time, however, these duplicate rows do fall into a number of different categories that we are going to discuss in this article. This article focuses on a specific scenario, when data inserted into a database table, leads to the introduction of duplicate records and then we will take a closer look at methods for removing duplicates and finally remove the duplicates using these methods. Before we start exploring the different options available to remove duplicates, it is worthwhile at this point to set up a sample database which will help us to understand the situations when duplicate data makes its way into the system and the approaches to be used to eradicate it. Start by creating a very simple database which consists of only a Student table at the beginning. You have successfully prepared the sample data by setting up a database with one table and two distinct different records. We are going to discuss now some potential scenarios in which duplicates were introduced and deleted starting from simple to slightly complex situations. Let us deliberately insert a duplicate record for Student: Asif to the Student table as follows:. In the self-referencing method, we take two references to the same table and join them using column-by-column mapping with the exception of the ID which is made less than or greater than the other. We can remove the duplicates using the same method we used to find duplicates with the exception of using DELETE in line with its syntax as follows:. Now that we know our scripts can successfully find and remove duplicate rows, it is better to turn them into view and stored procedure for ease of use:. Let us now add four more records to the Student table and all the records are duplicates in such a way that they have the same name, course, marks and exam date:. So far, we have identified duplicate records having distinct IDs but what if the IDs are the same. For example, think of the scenario in which a table has been recently imported from a text or Excel file that has no primary key. In this case, a table is said to have duplicate records if all the column values are exactly the same including some ID column and the primary key is missing which made it easier to enter the duplicate records. In order to reproduce the scenario in which duplicate records in the absence of a primary key fall into a table, let us first create a new Course table without any primary key in the University2 database as follows :. So, we have successfully learned how to remove duplicates from a database table using two different methods based on two different scenarios. Try creating the UspRemoveDuplicatesByAggregate stored procedure based on the method mentioned above and remove duplicates by calling the stored procedure. Try modifying the stored procedure created above UspRemoveDuplicatesByAggregates and implement Clean up tips mentioned in this article. Can you be sure that the UspRemoveDuplicatesByAggregate stored procedure can be executed as many times as possible, even after removing the duplicates, to show that the procedure remains consistent in the first place?

Sql query remove duplicate rows based on one column

We've got lots of great SQL Server experts to answer whatever question you can come up with. Home Weblogs Forums Search:. Is it from an app? From a file? From another table? Or do the inserts one at a time so as the whole won't fail. How about an instead of trigger then? How can it accept rows? Subscribe to SQLTeam. Home Weblogs Forums. Add a unique constraint to the columns that need to be unique. HI, OBVIOUSLY the identity column cannot be duplicate, so what im trying to say is the other columns have the same data example idclient identity city name lastname phone 1 miami peter smith 2 miami peter smith thats what im trying to avoid but i dont know how, i have 2 record with different idclient because is identity, but all other columns are exactly the same i dont want to save same records any help will be appreciate many many thanks kind regards. Add a unique constraint over the columns to be unique, that way SQL protects the data. How are you doing the insert? Well if you can't change the app, then a staging table solution isn't going to help you as it requires you to write the rows to a different table first. Show us the stored procedure. Next Page.

Sql code for duplicate insert

How to avoid inserting duplicate records in sql server c#
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