Select * from (Select *, ROW_NUMBER() OVER(order by salary) as rn from Employee) where MOD (rn, 2) =0 the above query will display all the even number, replace 1 with 0 to get all the odd numbers!
select row_number() over(order by emp_no) as row_num, emp_no, department, salary from ( select emp_no, department, salary from employees )as sub_query where emp_no %2 0;
Oracle's ROWNUM is a pseudo column that numbers the rows in a result set. Unfortunately, it numbers the rows in the set before ordering is applied. So combining the two in the same query won't get you the results you expect. Instead, you should move your selection and ordering into a subquery, and use ROWNUM only on the outer query.
Oracle's ROWNUM is a pseudo column that numbers the rows in a result set. Unfortunately, it numbers the rows in the set before ordering is applied. So combining the two in the same query won't get you the results you expect. Instead, you should move your selection and ordering into a subquery, and use ROWNUM only on the outer query.
Oracle's ROWNUM is a pseudo column that numbers the rows in a result set. Unfortunately, it numbers the rows in the set before ordering is applied. So combining the two in the same query won't get you the results you expect. Instead, you should move your selection and ordering into a subquery, and use ROWNUM only on the outer query.
YOU ARE MISSING AS CLAUSE USE THIS: SELECT * FROM( SELECT emp_no, salary, ROW_NUMBER() OVER(ORDER BY emp_no) AS row_num from salaries order by row_num ) AS k WHERE MOD(row_num,2) = 0
@@illarasool4472 vel 15, State 1, Line 39 The ORDER BY clause is invalid in views, inline functions, derived tables, subqueries, and common table expressions, unless TOP, OFFSET or FOR XML is also specified.
MySql query, sorry for late reply after learning: select * from (select row_number() over (order by salary desc) as rowNum, Emp_Id, Project, Salary from EmployeeSalary) as firstQuery where rowNum % 2 != 0;
for SSMS (MS SQL) people: try this, SELECT empID, empName, empSalary FROM ( SELECT empID, empName, empSalary, ROW_NUMBER() OVER (ORDER BY empsalary DESC) AS Rn FROM emp ) AS altsal WHERE Rn % 2 = 0;
No, Order by clause always in last. you can write like : select * from( select rownum rn, employee_id, SALARY from emp order by rn) where mod(rn,2)!=0;
use this statement Select SELECT empno as e from emp where e='Some_name'; it will still give you an error you can't refer to field aliases in the WHERE clause.
If you are a mysql user then this query might be helpful to you to display alternate record set @row_number:=0; select sequential_row, id from ( select @row_number:=@row_number+1 as sequential_row, id from employee order by salary ) as numbered_row where mod(sequential_row, 2) = 0;
Select * from (Select *,
ROW_NUMBER() OVER(order by salary) as rn from Employee)
where MOD (rn, 2) =0
the above query will display all the even number, replace 1 with 0 to get all the odd numbers!
bro rownum can be used with asterisk to fetch the whole data of the table, use query- select rownum,b.* from emp b;
==> for even
select * from TABLEname
where rol_no % 2 = 0 order by roll_no;
with cte_row_num as (
select *, row_number() over(order by (select null)) as rn from table
)
select * from cte_row_num where rn%2=0
select row_number() over(order by emp_no) as row_num, emp_no, department, salary
from
(
select emp_no, department, salary
from employees
)as sub_query
where emp_no %2 0;
we can use rank() with CTid to give rownum to every records for postgres DB, because in postgres rownum doesn't work :)
excellent!
why were we required to use subquery. I thought it could be done without any subquery but it didn't work. Can someone tell me the reason
Oracle's ROWNUM is a pseudo column that numbers the rows in a result set. Unfortunately, it numbers the rows in the set before ordering is applied. So combining the two in the same query won't get you the results you expect. Instead, you should move your selection and ordering into a subquery, and use ROWNUM only on the outer query.
whats the use of outer subquery?
Oracle's ROWNUM is a pseudo column that numbers the rows in a result set. Unfortunately, it numbers the rows in the set before ordering is applied. So combining the two in the same query won't get you the results you expect. Instead, you should move your selection and ordering into a subquery, and use ROWNUM only on the outer query.
Why there is outer subquery used like select * from
rownum gets its physical memory after the where clause so you need to make another table then use mod fun
Oracle's ROWNUM is a pseudo column that numbers the rows in a result set. Unfortunately, it numbers the rows in the set before ordering is applied. So combining the two in the same query won't get you the results you expect. Instead, you should move your selection and ordering into a subquery, and use ROWNUM only on the outer query.
how to deal with this error:
error 1248: every derived table must have its own alias sql
YOU ARE MISSING AS CLAUSE USE THIS:
SELECT * FROM(
SELECT emp_no, salary, ROW_NUMBER() OVER(ORDER BY emp_no) AS row_num
from salaries
order by row_num
) AS k
WHERE MOD(row_num,2) = 0
@@illarasool4472 thank you 🙌🏻
@@illarasool4472 vel 15, State 1, Line 39
The ORDER BY clause is invalid in views, inline functions, derived tables, subqueries, and common table expressions, unless TOP, OFFSET or FOR XML is also specified.
Can we use rownum in all database ?
Nope, in mysql we can't use rownum
@@redonthebeatboi so ?
Select*
From employee
Where MOD(id,2)=0
how to do it in mysql
MySql query, sorry for late reply after learning:
select * from
(select row_number() over (order by salary desc) as rowNum, Emp_Id, Project, Salary
from EmployeeSalary) as firstQuery
where rowNum % 2 != 0;
for SSMS (MS SQL) people:
try this,
SELECT empID, empName, empSalary
FROM (
SELECT empID, empName, empSalary, ROW_NUMBER() OVER (ORDER BY empsalary DESC) AS Rn
FROM emp
) AS altsal
WHERE Rn % 2 = 0;
Instead of subquery can we write
select rownum rn, empno, sal, ename from emp
order by rn
where mod(rn,2)!=0
Is it required to write order by rn here as it will be in ascending order by default right?
@@TheShy007 yup its not required
No, Order by clause always in last. you can write like :
select * from(
select rownum rn, employee_id, SALARY from emp
order by rn)
where mod(rn,2)!=0;
use this statement Select SELECT empno as e from emp where e='Some_name'; it will still give you an error you can't refer to field aliases in the WHERE clause.
bro, just put the link of the database in the comment description!!
means not equal to bro at 2:50
Yes.
What if the gap between records are 3 to get this how should we query like row number 1, 4, 7, 10
you can try "where mod(rn,3) == 1;"
What if we not use rownumber in this query?
If you are a mysql user then this query might be helpful to you to display alternate record
set @row_number:=0;
select sequential_row, id from
(
select @row_number:=@row_number+1 as sequential_row, id
from employee
order by salary
) as numbered_row
where mod(sequential_row, 2) = 0;
Can you please send the oracle live sql link
-- select * from Employees where EmployeeID%2!=0;
What is rn please explain
Thanks in advance
rn is alias name, if very big name we have to handle, we use alias name like any small name which can use everywhere
Done
with temp as
(select *,dense_rank() over(order by id asc ,salary asc) as rankk from employee)
select * from temp where rankk%2!=0;
Thanks
Thank u bro .Plzz do like share and subscribe
How to do it in mysql?
use "rank over() as rownum" (this will work for MySQL and SQL server)
You said that we can't use rownum with * but what if we want to fetch all the columns and rownum, there must some other way to do it?
yes!!! you can use SELECT * FROM (SELECT rownum rn,e.* FROM emp e) WHERE MOD(rn,2)!=0;