How do you remove duplicate records in SQL?
HAVING COUNT(*) > 1;
- In the output above, we have two duplicate records with ID 1 and 3. …
- To remove this data, replace the first Select with the SQL delete statement as per the following query. …
- SQL delete duplicate Rows using Common Table Expressions (CTE) …
- We can remove the duplicate rows using the following CTE.
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 you conditionally remove duplicates?
To remove duplicate values, click Data > Data Tools > Remove Duplicates. To highlight unique or duplicate values, use the Conditional Formatting command in the Style group on the Home tab.
How do I remove duplicate rows in select query?
The go to solution for removing duplicate rows from your result sets is to include the distinct keyword in your select statement. It tells the query engine to remove duplicates to produce a result set in which every row is unique. The group by clause can also be used to remove duplicates.
How do I get rid of duplicate files?
Delete duplicate files
- On your Android device, open Files by Google .
- At the bottom, tap Clean .
- On the “Duplicate files” card, tap Select files.
- Select the files you want to delete.
- At the bottom, tap Delete .
- On the confirmation dialog, tap Delete .
How do you select distinct rows in SQL without using distinct?
Below are alternate solutions :
- Remove Duplicates Using Row_Number. WITH CTE (Col1, Col2, Col3, DuplicateCount) AS ( SELECT Col1, Col2, Col3, ROW_NUMBER() OVER(PARTITION BY Col1, Col2, Col3 ORDER BY Col1) AS DuplicateCount FROM MyTable ) SELECT * from CTE Where DuplicateCount = 1.
- Remove Duplicates using group By.
Why we should not use distinct in SQL?
If you are missing a join and using a GROUP BY, you’ll get back more information than you’re expecting. If you are missing a join and using DISTINCT the SQL engine will perform an unbounded (or partially bounded) join, narrow the results down, and then come up with the expected answer.
What can I use instead of distinct in Oracle?
The DISTINCT operator causes Oracle to fetch all rows satisfying the table join and then sort and filter out duplicate values. EXISTS is a faster alternative, because the Oracle optimizer realizes when the subquery has been satisfied once, there is no need to proceed further and the next matching row can be fetched.
How do I remove duplicate rows and keep the highest value only?
(1) Select Fruit column (which you will remove duplicates rows by), and then click the Primary Key button; (2) Select the Amount column (Which you will keep highest values in), and then click Calculate > Max. (3) Specify combination rules for other columns as you need.
How do you remove duplicates with the highest value?
If you want to remove all duplicates but leave the highest ones, you can apply this formula =MAX(IF($A$2:$A$12=D2,$B$2:$B$12)), remember to press Shift + Ctrl + Enter keys. 2. In the above formulas, A2:A12 is the original list you need to remove duplicates from.
How do I remove duplicates in sheets?
Google Sheets: Remove duplicates from a spreadsheet
- Select a column from where you want to remove the duplicates.
- Click Data > Remove duplicates.
- You will now see a pop-up. Tick the box next to Data has header now > click Remove duplicates > click Done.
- You can repeat the steps for other columns as well.
How do I remove duplicates from a query?
Remove duplicate rows
- To open a query, locate one previously loaded from the Power Query Editor, select a cell in the data, and then select Query > Edit. For more information see Create, load, or edit a query in Excel.
- Select a column by clicking the column header. …
- Select Home > Remove Rows > Remove Duplicates.
Why am I getting duplicate rows in SQL?
You are getting duplicates because more than one row matches your conditions. To prevent duplicates use the DISTINCT keyword: SELECT DISTINCT respid, cq4_1, dma etc…
How can we delete duplicate rows without Rowid in Oracle?
Use the rowid pseudocolumn. DELETE FROM your_table WHERE rowid not in (SELECT MIN(rowid) FROM your_table GROUP BY column1, column2, column3);