• Please refer to 'ROWID Datatype' and 'UROWID Datatype' for more information. Rowid values have several important uses: They are the fastest way to access a single row. They can show you how the rows in a table are stored. They are unique identifiers for rows in a table. You should not use ROWID as the primary key of a table.
• How to Find the Duplicates There are many ways you can find copies. Using group by is one of the easiest. To do this, list all the columns you identified in the previous step in the select and group by clauses.

• Cached
• Oracle Duplicate Row
• Oracle Sql Duplicate Rows Query
• How To Find Duplicate Records In Oracle Using Rownum
• Select Duplicate Rows In Oracle Using Rowid

• Interview Question: How to Find Duplicate Records in Table?

Answer: To Find Duplicate Records in table you can use following query:

5 ways to delete duplicate records Oracle Oracle PLSQ SQL. Here you can use both rank and densrank since both will give unique records when order by rowid. Removing duplicate rows from Oracle tables with SQL can be very tricky, and there are several techniques for identifying and removing duplicate rows from tables: Delete multiple duplicate rows Subquery to identify duplicate rows Use RANK to find and remove duplicate table rows.

select a.* from Employee a where rowid !=
(select max(rowid) from Employee b where a.Employee_num =b.Employee_num;

1.Command Used to fetch records:

Select * from Employee;

So we will start analysing above table.First we need to calculate the records or
fetch the records which are dupicate records.

We are again using concept of row_id here.So i am displaying row_ids of the
employees.

select e.*,e.row_id from Employee e;

Here you will see or analyse that for the duplicate records the row_ids are different.So our logic is fetch the records where the row_id is maximum.But we need to take care of joining condition because we want data for specific group.So in our table we will use Employee_num as condition.

So to Fetch the Duplicate records from table following is the Query:

How to download php website source code. select a.* from Employee a where rowid !=
(select max(rowid) from Employee b where a.Employee_num =b.Employee_num;

It will fetch following results:

Using Simple delete statement you can remove the duplicate records from the table.

Use Following Query:

Delete from Employee a where rowid != (select max(rowid) from Employee b where a.Employee_num =b.Employee_num;

Query 2 : Suggested By Reader Sai Jagdish:

Cached

DELETE FROM EMPLOYEE WHERE ROWID IN(SELECT ROWID FROM (SELECT E.*, ROW_NUMBER() OVER (PARTITION BY EMPNO ORDER BY EMPNO) RANK, ROWID FROM EMPLOYEE E) WHERE RANK!=1);

Query 3 : Suggested By Reader Milan Dhore

select Employee_num,count(*) from Employee
group by Employee_num
having count(Employee_num) > 1;

On Request of Reader :

Sap transport log. SAP Transportation Management Optimise logistics and improve services by increasing visibility and control with warehouse management software from SAP. The transport profile is the file 'TPPARAM' in the subdirectory 'bin' in the transport directory. In releases prior to 4.5A, this file was called TPPARAM The new transport profile TPDOMAIN.PFL generated by TMS is used for all calls of the transport control program from the SAP System. The settings in the transport profile TPPARAM are. How to find all the transport request for a particular object? You can go to table E071 (Change & Transport System: Object Entries of Requests/Tasks) and enter the name of your object in field OBJNAME (Object Name). SAP Basis Admin Books SAP System Administration, Security, Authorization, ALE, Performance Tuning Reference Books. Transport Tools Tools are a part of SAP Kernel and are used to manage R3 trans and transport control program. R3trans is known as SAP system transport which is used to transport the objects between different SAP systems. It is usually called for other transport control program, in particular from tp or by using SAP upgrade utilities.

Query to Find duplicate records in Mysql :

Lets say User wants to find out duplicate Employee Number records from Employee table,

Hope the query explanation is helpful to you .Please post comment if any questions or queries if you have.These kind of questions are always asked in interviews.

NO TIME TO READ CLICK HERE TO GET THIS ARTICLE

You are an Oracle DBA or developer and want to determine the location of duplicate rows in an Oracle table. You need it for example before attempting to place a unique index on the table. See below how can this be done.

On this page you can download Arial Narrow Bold Italic font version Version 2.20, which belongs to the family Arial Narrow (Bold Italic tracing). Font manufacturer is Arial-Narrow-Bold-Italic. Download Arial Narrow Bold Italic for free on AllFont.net. This font belongs to the following categories: cyrillic fonts, latinic fonts, russian fonts. Arial Narrow Bold Italic font 11800 views, 972 downloads File name: ARIALNBI.TTF File size: 174 Kb Total views: 11,800 Total downloads: 972. Download Arial Narrow Bold Italic, font family Arial Narrow by Monotype Typography, Inc. With Bold Italic weight and style, download file name is arialnbi.ttf. Arial narrow bold italic download. On this page you can download Arial Narrow Italic font version Version 2.20, which belongs to the family Arial Narrow (Italic tracing). Font manufacturer is Arial-Narrow-Italic. Download Arial Narrow Italic for free on AllFont.net. This font belongs to the following categories: cyrillic fonts, latinic fonts, russian fonts.

Oracle tables always have one guaranteed unique column, the rowid column. If you use a min/max function against your rowid and then select against the proposed primary key you can squeeze out the rowids of the duplicate rows pretty quick. For example:

Oracle Duplicate Row

SELECT * FROM customers o
WHERE rowid > (SELECT min(rowid) FROM customers i
WHERE o.city = i.city and o.rating = i.rating)

Oracle Sql Duplicate Rows Query

In the situation where multiple columns make up the proposed key,
they must all be used in the WHERE clause.

Here is another simple and dirty way to accomplish the same:

SELECT city, rating, count(*)
FROM customers
GROUP BY city, rating
HAVING count(*) > 1

How To Find Duplicate Records In Oracle Using Rownum

Select Duplicate Rows In Oracle Using Rowid