How do i select all the employees of a company and its child companies?
Using SQL Server 2008
Employee
Id | Name | CompanyId
Company
Id | Name | ParentCompanyId
Example:
1 Microsoft 0
2 Microsoft India 1
3 Microsoft Spain 1
I have this below query which gives only employees from Microsoft and not from Microsoft India & Spain.
SELECT Id, Name FROM Employee WHERE CompanyId=1
I am not good in SQL. Help me on this.
Use a CTE to build the company hierarchy, then join this back to the Employees table:
with CompanyHierarchy as
(
select Id
from Company
where Id = 1
union all
select c.Id
from Company c
inner join CompanyHierarchy ch on c.ParentCompanyId = ch.Id
)
select e.*
from CompanyHierarchy ch
inner join Employees e on ch.Id = e.CompanyId
SQL Fiddle with demo.
You can also substitute a CompanyId variable into the anchor portion of the CTE if you want to parameterize the statement:
with CompanyHierarchy as
(
select Id
from Company
where Id = #CompanyId
union all
select c.Id
from Company c
inner join CompanyHierarchy ch on c.ParentCompanyId = ch.Id
)
select e.*
from CompanyHierarchy ch
inner join Employees e on ch.Id = e.CompanyId
SQL Fiddle with demo, now with added hierarchy levels.
SELECT
employee.name,
company.id
FROM employee
INNER JOIN company
On employee.companyId= company.id
WHERE company.id IN (1,2,3)
And it is correct for the query as you are asking only for the records whose company id is 1.
You have to write your query something like this.
SELECT Id, Name FROM Employee WHERE CompanyId in (SELECT Id FROM Company)
Now I have tried the above, which does what your given query is required to do. But for the desired results on the basis of Comapny/ParentCompany, please try the following query.
SELECT e.Id, e.Names FROM Employee e WHERE e.CompanyId = 1
or e.CompanyId in (SELECT c.Id FROM Company c where c.ParentCompanyId = 1)
Hope this helps.
Related
I am trying to figure out how to write a sql statement (then I need to convert it to EF Core Lambda after which I not sure how to do either) that will solve my problem.
Problem
Must find all Inactive Companies in the last x days filtered by certain "TrackingEvents"
Tables
Companies
- Id
- Name
Branches
- Id
- Name
- CompanyId
Employees
- Id
- Name
- BranchId
Tracking
- Id
- EmployeeId (nullable...there is tracking for non members)
- Name
- TrackingEventId
TrackingEvents
- Id
-Name
Attempt
SELECT Companies.Name
FROM Branches INNER JOIN
Companies ON Branches.CompanyId = Companies.Id INNER JOIN
Employees ON Branches.Id = Employees.BranchId Left JOIN
Trackings ON Employees.Id = Trackings.EmployeeId
where Trackings.Id IS NULL
group by Companies.Name
I have not attempted to do filtering by date or tracking event.
What I have I don't think is right as what I think it is doing is that if 1 employee in the company has not done a search then the company is returned.
what I need to do is somehow group all employees, all branches and treat it as one. So if 1 employee meets the criteria then the "company" is skipped.
This returns companies that have no tracking events is the last 7 days
select companies.Name
from Companies
left join
(select b.CompanyID
from branches b
join employees e on e.branchID = b.id
join tracking t on t.EmployeeID = e.id
where [eventDate] > dateadd(day,-7, getdate())
) l on l.CompanyID=Companies.ID
where l.CompanyID is null
group by companies.Name
Try this:
select distinct Id, Name From Companies c
inner join Branches b on c.Id = b.CompanyId
inner join Employees e on b.Id = e.BranchId
where not exists
(Select 1 From Tracking t where t.EmployeeId = e.Id)
Let me know
I have an employee table:
I have a category table which joins userid and category id:
Category with value 1 is senior manager.
I want to find senior manager of each employee.Seniors Managers with category value of 1.
I need the output like this:
How can we achieve this in SQL Server 2008?
Any help appreciated.
Try:
WITH Emp_CTE AS (
Select ID,EmployeeName,Manager from employee
UNION ALL
SELECT ecte.ID,ecte.EmployeeName,c.Manager
FROM employee c
INNER JOIN Emp_CTE ecte ON ecte.Manager = c.ID
)
SELECT a.ID,a.EmployeeName,b.EmployeeName
FROM Emp_CTE a
left join employee b
on a.Manager = b.ID
left join category c
on a.Manager = c.UserID
where c.Category = '1'
As this query calls for a Self Join, this should work:
SELECT a.EMPLOYEENAME as Employee,
b.EMPLOYEENAME as Senior_Manager
FROM employee a
LEFT JOIN
employee b ON a.ID = b.Manager
LEFT JOIN
category c ON b.ID = c.UserID
WHERE c.Category = 1
I'm going to learn SQL, and having troubes with one of the excercises. "Get the number of customers each employee is responsible for" (I hope the translation is OK). I figured out following:
SELECT emp.EmployeeId, COUNT(cus.SupportRepId) AS Customers
FROM Employee AS emp JOIN Customer AS cus
ON cus.SupportRepId = emp.EmployeeId
GROUP BY emp.EmployeeId
The result is correct so far:
EmployeeId Customers
-------------------------
3 21
4 20
... ...
Now I thought it would be nice to addional employee's data in the result too (e.g. JobTitle from the table 'Employee'), but this doesn't seems to work:
SELECT emp.EmployeeId, emp.JobTitle, COUNT(cus.SupportRepId) AS Customers
FROM Employee AS emp JOIN Customer AS cus
ON cus.SupportRepId = emp.EmployeeId
GROUP BY emp.EmployeeId
I don't understand why. What should I have to in order to get the expected result:
EmployeeId JobTitle Customers
------------------------------------------------
3 Key Account Manager 21
4 Business Area Manager 20
... ...
I hope you can help. Have much thanks in before.
You can throw it in the GROUP BY:
SELECT e.EmployeeId, e.JobTitle, COUNT(c.SupportRepId) AS Customers
FROM Employee e JOIN
Customer c
ON c.SupportRepId = e.EmployeeId
GROUP BY e.EmployeeId, e.JobTitle;
Alternatively, you can use a correlated subquery or aggregate before joining:
SELECT e.*, c.Customers
FROM Employee e JOIN
(SELECT c.SupportRepId, COUNT(c.SupportRepId) AS Customers
FROM Customer c
GROUP BY c.SupportRepId
) c
ON c.SupportRepId = e.EmployeeId;
I am having trouble writing a query that will select all Skills, joining the Employee and Competency records, but only return one skill per employee, their newest Skill. Using this sample dataset
Skills
======
id employee_id competency_id created
1 1 1 Jan 1
2 2 2 Jan 1
3 1 2 Jan 3
Employees
===========
id first_name last_name
1 Mike Jones
2 Steve Smith
Competencies
============
id title
1 Problem Solving
2 Compassion
I would like to retrieve the following data
Skill.id Skill.employee_id Skill.competency_id Skill.created Employee.id Employee.first_name Employee.last_name Competency.id Competency.title
2 2 2 Jan 1 2 Steve Smith 2 Compassion
3 1 2 Jan 3 1 Mike Jones 2 Compassion
I was able to select the employee_id and max created using
SELECT MAX(created) as created, employee_id FROM skills GROUP BY employee_id
But when I start to add more fields in the select statement or add in a join I get the 'Column 'xyz' is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause.' error.
Any help is appreciated and I don't have to use GROUP BY, it's just what I'm familiar with.
The error that you were getting is because SQL Server requires any item in the SELECT list to be included in the GROUP BY if there is an aggregate function being used.
The problem with that is you might have unique values in some columns which can throw off the result. So you will want to rewrite the query to use one of the following:
You can use a subquery to get this result. This gets the max(created) in a subquery and then you use that result to get the correct employee record:
select s.id SkillId,
s.employee_id,
s.competency_id,
s.created,
e.id employee,
e.first_name,
e.last_name,
c.id competency,
c.title
from Employees e
left join Skills s
on e.id = s.employee_id
inner join
(
SELECT MAX(created) as created, employee_id
FROM skills
GROUP BY employee_id
) s1
on s.employee_id = s1.employee_id
and s.created = s1.created
left join Competencies c
on s.competency_id = c.id
See SQL Fiddle with Demo
Or another way to do this is to use row_number():
select *
from
(
select s.id SkillId,
s.employee_id,
s.competency_id,
s.created,
e.id employee,
e.first_name,
e.last_name,
c.id competency,
c.title,
row_number() over(partition by s.employee_id
order by s.created desc) rn
from Employees e
left join Skills s
on e.id = s.employee_id
left join Competencies c
on s.competency_id = c.id
) src
where rn = 1
See SQL Fiddle with Demo
For every non-aggregated column you add to your SELECT statement you need to update your GROUP BY to include it.
This article may help you understand why.
;WITH
MAX_SKILL_created AS
(
SELECT
MAX(skills.created) as created,
skills.employee_id
FROM
skills
GROUP BY
skills.employee_id
),
MAX_SKILL_id AS
(
SELECT
MAX(skills.id) as id,
skills.employee_id
FROM
skills
INNER JOIN MAX_SKILL_created
ON MAX_SKILL_created.employee_id = skills.employee_id
AND MAX_SKILL_created.created = skills.created
GROUP BY
skills.employee_id
)
SELECT
* -- type all your columns here
FROM
employees
INNER JOIN MAX_SKILL_id
ON MAX_SKILL_id.employee_id = employees.employee_id
INNER JOIN skills
ON skills.id = MAX_SKILL_id.id
INNER JOIN competencies
ON competencies.id = skills.competency_id
If you are using SQL Server than you can use OUTER APPLY
SELECT *
FROM employees E
OUTER APPLY (
SELECT TOP 1 *
FROM skills
WHERE employee_id = E.id
ORDER BY created DESC
) S
INNER JOIN competencies C
ON C.id = S.competency_id
I've always done this back asswards in PHP or ASAP, so I figure it's time to actually learn the proper way to do it in SQL. I have the following 4 tables in a database:
Category (Fields: CategoryNumber, Desc) (small table with 15 rows)
Media (Fields: MediaID, Desc, CategoryNumber, etc) (huge table with 15,000 rows)
Sales (Fields: Date, MediaID, EmployeeID etc) (huge table with 100,000 rows)
Employees (Fields: EmployeeID, Name, etc) (small table with only 20 rows)
Category only links to Media
Media has links to both Category and Sales.
Sales links to both the Media and Employee
Employee only links to Sales
What I would like to do is to write a query which tells me what categories a given employee has never sold any media in.
I can write a simple query that looks for unmatched data between 2 tables, but I have no clue how to do it when I'm dealing with 4 tables.
Thanks for your time and help!
Here's my suggestion:
select *
from Category c
where not exists (
select *
from Employee e
inner join Sales s on s.EmployeeId = e.EmployeeId
inner join Media m on m.MediaID = s.MediaID
where e.Name = 'Ryan' and m.CategoryNumber = c.CategoryNumber
)
To query all employes with the categories in which they didn't sell anything:
select e.EmployeeName, c.CategoryNumber
from Category c
cross join Employee e
where not exists (
select *
from Sales s
inner join Media m on m.MediaID = s.MediaID
where c.categoryNumber = m.CategoryNumber
and s.EmployeeId = e.EmployeeId
)
SELECT c.CategoryNumber, c.Desc
FROM Category c
WHERE NOT EXISTS
(
SELECT *
FROM Employees e
INNER JOIN Sales s on s.EmployeeID = e.EmployeeID
INNER JOIN Media m on m.MediaID = s.MediaID
WHERE e.Name = "Ryan"
AND m.CategoryNumber = c.CategoryNumber
)
MS Access evidently needs a lot of parentheses (thanks, Ryan!):
select *
from Category c
where not exists
( select *
from ( Employee e
inner join Sales s on (s.EmployeeId = e.EmployeeId))
inner join Media m on (m.MediaID = s.MediaID)
where (e.Name = 'Ryan' and m.CategoryNumber = c.CategoryNumber) )
select c.desc
from category
left outer join (select s.employeeid,m.categorynumber
from sales s
inner join media m on s.mediaid=m.mediaid
inner join employee e on e.employeeid=s.employeeid
where e.name = 'JOE'
group by employeeid,categorynumber) t on t.categorynumber=c.categorynumber
where s.employeeid is null
Modified Answer based on the solution provided by Carl in Access SQL Syntax:
select *
from Category c
where not exists (
select *
from (Employee e
inner join Sales s on (s.EmployeeId = e.EmployeeId))
inner join Media m on (m.MediaID = s.MediaID)
where (e.Name = 'Ryan' and m.CategoryNumber = c.CategoryNumber)
)