How do you find duplicates in PL SQL?

Posted on by Muna Meyer

How do you find duplicates in PL SQL?

How to Find Duplicate Records in Oracle

  1. SELECT * FROM fruits;
  2. SELECT fruit_name, color, COUNT(*) FROM fruits GROUP BY fruit_name, color;
  3. SELECT fruit_name, color, COUNT(*) FROM fruits GROUP BY fruit_name, color HAVING COUNT(*) > 1;

How do I select duplicate records in Oracle?

select * from table where column_name in (select ing. column_name from table ing group by ing. column_name having count(*) > 1) order by column_name desc; also can add some additional filters in the where clause if needed.

How do I find duplicate rows in Oracle using Rowid?

The most effective way to remove duplicate rows is with a self-join: DELETE FROM person_table a WHERE a. rowid > ANY (SELECT b. rowid FROM person_table b WHERE a.

How can I find duplicate rows?

Find and remove duplicates

  1. Select the cells you want to check for duplicates.
  2. Click Home > Conditional Formatting > Highlight Cells Rules > Duplicate Values.
  3. In the box next to values with, pick the formatting you want to apply to the duplicate values, and then click OK.

How do I find non duplicate records 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.

How do I find duplicates and deletes in SQL?

  1. 1) First identify the rows those satisfy the definition of duplicate and insert them into temp table, say #tableAll .
  2. 2) Select non-duplicate(single-rows) or distinct rows into temp table say #tableUnique.
  3. 3) Delete from source table joining #tableAll to delete the duplicates.

How do I find and delete duplicate rows in SQL?

Delete Duplicates From a Table in SQL Server

  1. Find duplicate rows using GROUP BY clause or ROW_NUMBER() function.
  2. Use DELETE statement to remove the duplicate rows.

How do I find duplicate records in SQL Server without group by?

1. Using the Distinct Keyword to eliminate duplicate values and count their occurences from the Query results. We can use the Distinct keyword to fetch the unique records from our database. This way we can view the unique results from our database.

How do you find unique records from a set of tables?

The unique values are fetched when we use the distinct keyword.

  1. SELECT DISTINCT returns only distinct (different) values.
  2. DISTINCT eliminates duplicate records from the table.
  3. DISTINCT can be used with aggregates: COUNT, AVG, MAX, etc.
  4. DISTINCT operates on a single column.

How do you duplicate records 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.