I have two tables, employee and inventory. One employee can have zero or more inventories.
I would like to list employee information along with at most one inventory information
and count of inventories belongs to one employee.
employee table
emp_num last_name first_name
-----------------------------------
100 john smith
101 mike pet
102 jes lyoid
inventory table
inv_num emp_num
---------------------------
12 100
13 100
15 100
30 102
desired Output
emp_num last_name invnum count(inv_num)
--------------------------------------------------------------------------
100 john 12 3
101 mike - 0
102 jes 30 1
What sql query can I use in this case?
Try this:
SELECT emp_num, last_name, MAX(inv_num) AS invnum, COUNT(inv_num) AS inv_count
FROM employee e LEFT OUTER JOIN inventory i ON e.emp_num = i.emp_num
GROUP BY e.emp_num, e.last_name
You could do something like this
Select E.Emp_Num,
e.Last_name,
MIN(Inv_Num) AS OldestInv,
COUNT(Inv_Num) AS TotalInv
FROM Employee E
LEFT OUTER JOIN Inventory I
(E.Emp_Num = I.Emp_Num)
GROUP BY E.Emp_Num, E.Last_Name
This will give you the minimum invoice number and the total count. The left outer join is the key
SELECT
e.emp_num,
e.last_name,
IFNULL(MAX(i.inv_num),'-') AS 'invnum',
COUNT(i.inv_num) AS 'count(inv_num)'
FROM
employee e LEFT JOIN inventory i
ON e.emp_num = i.emp_num
GROUP BY
e.emp_num, e.last_name
Related
I want to Join result table if the emp_id is repeated. and display employees first name.
result table code:
SELECT emp_id, COUNT(*)
FROM Employment
GROUP BY emp_id
HAVING COUNT(*) > 1
Employment table:
emp_id
task_complete
year
1
task1
2020
1
task2
2020
3
task3
1999
4
task4
2001
Employee table:
emp_id
first_name
last_name
1
Jon
Doe
2
Don
Juan
3
Steve
Works
4
Loki
Odinsen
So that employee 1 has done 2 tasks, Result should look like:
emp_id
first_name
tasks_done
1
Jon
2
This looks like group by and having:
select e.emp_id, e.first_name, count(*)
from employee e join
tasks t
on e.emp_id = t.emp_id
group by e.emp_id, e.first_name
having count(*) > 1;
I have a query like this:
select employee_id, salary
from salary
left join employee on salary.employee_id=employee.id_employee;
It returns me these results
EMPLOYEE ID | SALARY
-------------|-------
1 | 50
2 | 50
3 | 50
1 | 30
How do I remove duplicates by adding them up, like this:
EMPLOYEE ID | SALARY
------------|--------
1 | 80
2 | 50
3 | 50
There is no reason for a left join from salary to employee. Presumably, every employee_id in salary refers to a valid employee. So, this should do what you want:
select s.employee_id, sum(s.salary) as salary
from salary s
group by s.employee_id;
If you want all employees, even those who are not in the salary table, then an outer join is appropriate -- but employee should be first:
select e.id_employee, sum(s.salary) as salary
from employee e left join
salary s
on s.employee_id = e.id_employee
group by e.id_employee;
Employees not in salary will have a value of NULL.
Note that the group by condition in this query is on employee, the first table in the left join.
select employee_id, SUM(salary) as salary
from salary
left join employee on salary.employee_id=employee.id_employee
group by emplyee_id;
This is exactly what a group by clause is for. You'll have to group by the emplopyee_id and specify how you want to aggregate the salary:
SELECT employee_id, SUM(salary)
FROM salary
GROUP BY employee_id
I have two tables :
One for employees data Employee
Another for employee vacations balance VacBal
Now i want to get the current vacation balance for each employee,considering if the emp_num = 0 then it's a general balance for all employees not for specific employee
If Employee table Sample data like that :
emp_num name
546 john
134 Ramy
and
VacBal like that
emp_num bal_num bal_date
546 1 5-5-2015
546 2 6-5-2015
134 1 7-5-2015
0 3 2-2-2015
0 4 6-1-2015
I want result set like this :
emp_num name SUM(bal_num)
546 john 10 --->3+7
134 Ramy 8 --->1+7
How to do this ?
You can use a correlated sub-query to SUM:
select e.emp_num, e.name, (select sum(vb.bal_num) from VacBal vb
where vb.emp_num in (e.emp_num,0))
from Employee e
SELECT e.emp_num,
name,
Sum(bal_num) + (SELECT Sum(bal_num)
FROM vacbal vb
WHERE emp_num = 0)
FROM employee e
inner join vacbal v on e.emp_num=v.emp_num
GROUP BY e.emp_num,
name
hi i have problem in sql query example
Employee
empid empname
1 gan
2 sam
Designation
id desig empid
1 sr officerr 1
2 jr officer 1
3 manager 2
i want join tables and want Employee Table repeated records Null
result like
empid name desig id
1 gan sr officerr 1
1 NULL jr officer 2
2 sam manager 3
i working on query but i not getting result
SELECT DISTINCT designatin.empid, employee.empname,designatin.desig
FROM designatin INNER JOIN employee e ON employee.empid = designatin.empid
GROUP BY employee.empid, employee.empname, designatin.desig
can anybody have solution?
Change the inner join to a left join:
SELECT DISTINCT designatin.empid, employee.empname,designatin.desig
FROM designatin LEFT JOIN employee e ON employee.empid = designatin.empid
GROUP BY employee.empid, employee.empname, designatin.desig
Let try this, it will help you
SELECT e.empid, e.empname,d.desig ,d.id
FROM employee e
INNER JOIN Designation d ON e.empid = d.empid
See DEMO
I have three tables Attendance, Employee, Sector
Employee Table
EmiId -Name -SectorId
123 ABC 1
231 BCD 2
125 WER 1
Attendance
AttId -EmpId -Dt
1 123 12/12/2014 9:00
2 231 12/12/2014 10:00
Sector
SectorId -SectorName
1 North Sector
2 East Sector
my query is
SELECT COUNT(Attendance.Emp_Id) as AttCount,(select COUNT(*) from Employee) as EmpCount
FROM Employee INNER JOIN
Sector ON Employee.SectorId = Sector.SectorId INNER JOIN
Attendance ON Employee.EmpId = Attendance.EmpId
group by Sector.SectorId
and i keep getting same number of employees for both instead so the (select COUNT(*) from Employee)- EmpCount seems to be incorrect.I keep getting the same number for both the sectors. Although the Attcount seems to work fine.
Please help. Thanks in advance.
You just making select count from the same table - do not expect other results.
Perhaps someone could do it better
SELECT COUNT(Attendance.Emp_Id),COUNT(case when Employee.empid=attendance.attid then 1 else 0 end)
FROM Employee JOIN Sector ON Employee.SectorId = Sector.SectorId
LEFT JOIN Attendance ON Employee.EmpId = Attendance.Emp_Id
group by Sector.SectorId
Maybe you need LEFT JOIN with Attendance
SELECT COUNT(Attendance.Emp_Id),(select COUNT(*) from Employee)
FROM Employee JOIN Sector ON Employee.SectorId = Sector.SectorId
LEFT JOIN Attendance ON Employee.EmpId = Attendance.EmpId
group by Sector.SectorId