Sql remove duplicates based on column

I want to leave only the updated one based on date column. Remove duplicates based on one column. Select all Open in new window. How do I return all records and columns and only remove and additional lines that have the same WWID?

I need to remove the duplication of rows based on column to have unique data in this column , additionally I need another condition when the value equal specific information. But each game has a duplicate entry in the table somewhere, because each game was in the schedules for two teams. Is there a sql statement I can use to look through and delete all the duplicates based on identical date, time, hometeam_i awayteam_i locationcity, and locationstate fields? I am not sure if the duplicate logic is only based on (activity_i user_id) or all columns.

Anyway, it is easy to accomplish when using ROW_NUMBER function. In SQL Server there are a number of ways to address duplicate records in a table based on the specific circumstances such as: Table with Unique Index - For tables with a unique index, you have the opportunity to use the index to order identify the duplicate data then remove the duplicate records. Identification can be performed with self-joins, ordering the data by the max value, using the RANK function or using NOT IN logic.

Suppose you have data in which you need to find the duplicates in a single column (for example to find common names in a list of names) or in multiple columns (for example to find all the persons who have same name and age but reside at a different address). In these situations, we could do that easily by applying GROUP BY and HAVING clauses. Let us see how to use these SQL clauses. The problem with my data is that there may be completely identical rows in there which i want to remove.

At the end i only want to keep the truly unique rows. Based on the colums it is possible that out of rows contain the same values but only one has a different one. Which column that different value is in differs. Sometimes its colum A. So, we have successfully learned how to remove duplicates from a database table using two different methods based on two different scenarios. You can now easily identify and relieve a database table from duplicate value.

Do you need to use SQL to remove duplicates in your tables? Learn how to write an SQL query to remove duplicate data, and see the performance of each way you can do it, in this article. Let’s say you have a table with some data in it. You’ve found out that there is some duplicate data in this. The group by should be producing exactly the same output for those columns , and then the max would give you one more column , as you want.

But basically highlight those columns and under remove rows hit remove duplicates. You may also want to duplicate the query and keep only duplicates and return a problem table but not required if you don’t want to look at it. How to delete duplicate records based on single column from a table? SELECT col_name FROM table_name GROUP BY col_.

Introduction to SQL DISTINCT operator. The primary key ensures that the table has no duplicate rows. Rate this: Please or sign in to vote. Removing Duplicates in a Table based on two Columns.

Below is my table NameNameDistance BG CH 2CH BG 2CH HY 3HY CH 3CH CBE 5I want remove duplicates in it How can i do it? An explanation of how to find rows with duplicate values in a table using SQL. Finishes by showing how to stop people entering new duplicates ! Eliminating Duplicate Rows with DISTINCT. I would like to keep one of the duplicate records, in this case, the record with the lowest id value.

Columns often contain duplicate values, and it’s common to want a result that lists each duplicate only once. But this lets me delete duplicate in the flatfile?