How to delete duplicate recordings at Oracle

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Title : How to delete duplicate recordings at Oracle
Link : How to delete duplicate recordings at Oracle

When working on Oracle, you can find duplicates on some notes. You can delete duplicate lines by identifying them and using the RowID alias row address (row address) related. Before starting, create a backup table if you need references after the record is deleted.

Step

Identifying Duplicates

Duplicate identification. In this example, we identify the "Alan" duplicate. Make sure the note to be deleted is indeed a duplicate by entering SQL below.
Identification of the column titled "Name". If the column has the title "Name", you need to replace it "column_name" by the name.
Identification of other columns. If you try to identify duplicates from different columns, such as Alan's age instead of his name, enter "Age" to replace "column_name" etc.

Removing Single Duplicate

Choose "name from names". After" SQL "(short for Standard Query Language), put in "select name from names"
Delete all rows with duplicate names. After "SQL", enter "delete from names where name= 'Alan' ;. "It should be noted that capital letters are important here so that this Step : can delete all lines named" Alan ". After" SQL ", enter"commit"^[1]
Re-enter the line without duplicates. Now that you delete all the lines and replace them with "Alan", fill in one again by entering "insert into name values ('Alan'); "After" SQL ", enter"commit"to create a new line.
See the new list. After completing the Step :s above, you can check to make sure there are no duplicate records by entering "select * from names"

Removing Multiple Duplicates

Select RowID that you want to delete. After "SQL", enter "select rowid, name from names;
Delete duplicates. After "SQL", enter "delete from names a where rowid> (select min (rowid) from names b where b.name = a.name); "to delete duplicates.^[2]
Check for duplicates. After completing the Step :s above, check if there are still duplicates by entering "select rowid, name from names;" then "commit"

Delete Lines with Columns

Select row. After "SQL", enter "select * from names; "to be able to see the line.
Delete duplicate lines by identifying the column. After "SQL" "enter"delete from names a where rowid> (select min (rowid) from names b where b.name = a.name and b.age = a.age); "to delete duplicate records.^[3]
Duplicate check. After you complete the Step :s above, enter "select * from names; "then"commit"to ascertain whether the duplicate has actually been deleted.