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How do I eliminate duplicate rows in SQL?


  1. How do I eliminate duplicate rows in SQL?
  2. How do I select rows without duplicates in SQL?
  3. What can I use instead of distinct in SQL?
  4. How do I select only duplicate rows in SQL?
  5. Can I use GROUP BY instead of distinct?
  6. How do I remove duplicate rows from student table?
  7. How do you prevent duplicates in SQL table?
  8. Why distinct is bad in SQL?
  9. Is GROUP BY better than distinct?
  10. How do I stop inserting duplicate records in mssql?
  11. Does GROUP BY remove duplicates?
  12. Which clause is used to remove the duplicate rows of the table in SQL?
  13. Does distinct remove duplicates?
  14. How do you prevent duplicates in SQL?

How do I eliminate duplicate rows in SQL?

It can be done by many ways in sql server the most simplest way to do so is: Insert the distinct rows from the duplicate rows table to new temporary table. Then delete all the data from duplicate rows table then insert all data from temporary table which has no duplicates as shown below.

How do I select rows without duplicates in SQL?

SELECT DISTINCT returns only unique values (without duplicates). DISTINCT operates on a single column. DISTINCT can be used with aggregates: COUNT, AVG, MAX, etc.

What can I use instead of distinct in SQL?

6 Answers. GROUP BY is intended for aggregate function use, DISTINCT just removes duplicates (based on all column values matching on a per row basis) from visibility. If TABLE2 allows duplicate values associated to TABLE1 records, you have to use either option.

How do I select only duplicate rows in SQL?

To select duplicate values, you need to create groups of rows with the same values and then select the groups with counts greater than one. You can achieve that by using GROUP BY and a HAVING clause.

Can I use GROUP BY instead of distinct?

Well, GROUP BY and DISTINCT have their own use. GROUP BY cannot replace DISTINCT in some situations and DISTINCT cannot take place of GROUP BY. It is as per your choice and situation how you are optimizing both of them and choosing where to use GROUP BY and DISTINCT.

How do I remove duplicate rows from student table?

SQL query to delete duplicate rows using CTE First, the CTE uses the ROW_NUMBER() function to find the duplicate rows specified by values in the student name and marks columns. Then, the DELETE statement deletes all the duplicate rows but keeps only one occurrence of each duplicate group.

How do you prevent duplicates in SQL table?

You can prevent duplicate values in a field in an Access table by creating a unique index....In the SQL, replace the variables as follows:Replace index_name with a name for your index. Replace table with the name of the table that contains the field to be indexed.

Why distinct is bad in SQL?

Well, improper use of "distinct" not only hides the real problem (duplicate entries in the tables, lack of condition in the on clause) as discussed above but also degrades query performance. This will bring the IO Cost (logical reads) of the query goes up significantly.

Is GROUP BY better than distinct?

While DISTINCT better explains intent, and GROUP BY is only required when aggregations are present, they are interchangeable in many cases.

How do I stop inserting duplicate records in mssql?

Prepare Test Data for SQL INSERT INTO SELECT Code SamplesImport the Data in SQL Server. Create 2 More Tables. Using INSERT INTO SELECT DISTINCT. Using WHERE NOT IN. Using WHERE NOT EXISTS. Using IF NOT EXISTS. Using COUNT(*) = 0. Comparing Different Ways to Handle Duplicates with SQL INSERT INTO SELECT.Mar 17, 2021

Does GROUP BY remove duplicates?

5 Answers. GROUP BY does not "remove duplicates". GROUP BY allows for aggregation. If all you want is to combine duplicated rows, use SELECT DISTINCT.

Which clause is used to remove the duplicate rows of the table in SQL?

To eliminate duplicate rows in the result, the DISTINCT keyword is used in the SELECT clause.

Does distinct remove duplicates?

The DISTINCT keyword eliminates duplicate rows from a result. Note that the columns of a DISTINCT result form a candidate key (unless they contain nulls).

How do you prevent duplicates in SQL?

In the Navigation Pane, right-click the table that contains the field, and then click Design View. Select the field that you want to make sure has unique values. In the Field Properties pane at the bottom of the table design view, on the General tab, set the Indexed property to Yes (No duplicates).



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