check whether all the emp numbers are indeed unique.
Answers were Sorted based on User's Feedback
Answer / nagendra
select empno, count(empno)
from emp
group by empno
having count(empno) > 1;
Is This Answer Correct ? | 22 Yes | 4 No |
Answer / santhi kandasamy
In Oracle,
select empno from emp where empno is not null
group by empno
having count(*) >1;
if the above query does not return any rows then you can
consider, empno having unique values.
Is This Answer Correct ? | 7 Yes | 0 No |
Answer / eswar
select empno,count(empno)
from emp group by empno having count(empno)>1;
Is This Answer Correct ? | 1 Yes | 0 No |
in rownum we will use < or <= operators only.
If any one knows this query pls send the answer.
Is This Answer Correct ? | 0 Yes | 1 No |
Answer / biswajit rout
SELECT empno,count(*) FROM emp GROUP BY empno;
Is This Answer Correct ? | 0 Yes | 1 No |
Answer / valli
select rowid from (
select emp_no, rownum() over (emp_no) as Rownum
from emp order_by emp_no,sal
) where rownum > 2
If this query returns no rows then we can say all the emp
numbers are indeed unique.
Regard,
Valli
Is This Answer Correct ? | 0 Yes | 5 No |
Can we declare a column having number data type and its scale is larger than pricesionex: column_name number(10,100),column_name numbaer(10,-84)
how to rename an existing table in mysql? : Sql dba
How will you a activate/deactivate integrity constraints?
What is cold data?
Why do we use function in pl sql?
Why do we use joins?
what are the different type of sql's statements ? : Sql dba
What are nested triggers ?
6 Answers Amazon, Appeal Soft, IBM, Infosys, TCS,
how i do the database testing of online money transactions between two parties (client and organization). suppose our company makes a website for our client and give a extra feature of online money transaction with there clients then how i test this feature in database testing
In packages the source code is compiled into p code ? how do we describe the p code
What is sql stand for?
What is null in pl/sql?