write a query to delete similar records in particular
fields(columns) in different tables
Answers were Sorted based on User's Feedback
Answer / ram
Guys, Please see the question again. It is related to
deleting different tables. I guess, the question is
intented to get the answer - ON DELETE CASCADE. We give
foreign constraints on tables and when the parent record is
deleted, the child records are automatically deleted when
you give command as ON DELETE CASCADE
Is This Answer Correct ? | 4 Yes | 1 No |
Answer / madhu
delete from emp where emp_no in
(select emp_no from emp2 where emp.emp_no=emp2.emp_no)
Is This Answer Correct ? | 7 Yes | 4 No |
Answer / ramkumar v
CREATE OR REPLACE PROCEDURE DUP AS
DECLARE
TABLENAME_TMP TABLE;
CURSOR C1 IS
SELECT M.TABLE_NAME
FROM USER_TAB_COLS M
WHERE M.COLUMN_NAME LIKE 'EMPNO';
BEGIN
OPEN C1;
LOOP
FETCH C1 INTO TABLENAME_TMP;
WHEN C1%NOTFOUND THEN EXIT;
DELETE FROM TABLENAME_TMP A WHERE ROWID NOT IN
(SELECT MAX(ROWID) FROM TABLENAME_TMP B
WHERE A.EMPNO>=B.EMPNO);
ENDLOOP;
CLOSE C1;
END DUP;
Is This Answer Correct ? | 4 Yes | 4 No |
Answer / khandu shinde
delete from emp where rowid not in ( select max(rowid) from
emp group by empno)
Is This Answer Correct ? | 7 Yes | 9 No |
Answer / satyam kumar
Hi,
I have manipulated Khandu Shinde answer because it will
delete complete row.
delete from emp where rowid not in ( select max(rowid) from
emp group by empno having count(redundantcolumnName) > 1)
Note: work only with Oracle.
Is This Answer Correct ? | 1 Yes | 5 No |
Answer / rajesh
DELETE emp WHERE ROWID NOT IN(SELECT MIN(eid)FROM emp GROUP
BY eid);
Is This Answer Correct ? | 1 Yes | 5 No |
Why do we create views in sql?
What is PL/SQL table ?
How many subqueries can be nested in a statement?
What is right join in sql?
Source is Sales Table: Sno Prod Sales Sales_Amount 1 A 10 2000 2 A 20 1000 3 C 10 3000 4 D 30 4000 5 A 20 1000 Target : Sales_Count T_Sales_Amt Sales_Count(A) T_Sales_Amt(A) 90 11000 50 4000 In single query, pls tell me.
Explian rowid, rownum? What are the psoducolumns we have?
What is a string data type in sql?
What is difference between CHAR and VARCHAR2?What is the maximum SIZE allowed for each type?
if we give update table_name set column_name= default. what will happen?
diff b/w function and procedure?
Can I call a procedure inside a function?
What are expressions?