How To Eliminate The Duplicate Rows From A Table


The syntax to delete duplicate rows from a table is :


SQL> delete from table_name where rowid not in (select max(rowid) from table group by
duplicate_values_field_name);


Or


SQL> delete duplicate_values_field_name dv from table_name ta where rowid <(select min(rowid) from
table_name tb where ta.dv=tb.dv);


Example: Consider the employee table below. You can see that employee Jiyo is present in the table twice with the employee no 103 and 104.


Empno Ename
101 Scott
102 Jiyo
103 Millor
104 Jiyo
105 Smith


Now, here is the syntax to remove the duplicate records from the above table.


delete ename from emp a where rowid < ( select min(rowid) from emp b where a.ename = b.ename);


After the above delete statement the output will be :


Empno Ename
101 Scott
102 Millor
103 Jiyo
104 Smith

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Oracle Apps Guy: How To Eliminate The Duplicate Rows From A Table
How To Eliminate The Duplicate Rows From A Table
How To Eliminate The Duplicate Rows From A Table,The syntax to delete duplicate rows from a table is :
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https://www.oracleappsguy.com/2011/04/how-to-eliminate-duplicate-rows-from.html
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