Answer Posted / daisy

1) select all the Employees who does not have phone?

select * from employees where empid not in (select empid
from phone)

2)Dispaly all managers from table(Manager id is same as
Empid)

select * from employees emp where emp.employeeid = emp.mgrid

3)How to know How many tables contain Empno as a column in
database?

4)Find duplicate rows in a table or if we have table with
one column which
has many records which are not distinct. How to find out
the distinct
values from that column and number of times it's repeated?

select salary,count(salary) as Repeat from employees group
by salary having salary > 1

5) How to delete the rows which are duplicate?(Don't remove
both duplicate
records.)
WITH [T ORDERED BY ROWID] AS

(SELECT ROW_NUMBER() OVER (ORDER BY product_name ASC) AS
ROWID, * FROM product where product_name ='Scale')

DELETE FROM [T ORDERED BY ROWID] WHERE ROWID <> 1

6)How to find the 6th highest salary?

SELECT TOP 1 salary

FROM (

SELECT DISTINCT TOP 6 salary

FROM employee

ORDER BY salary DESC) a

ORDER BY salary

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