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i have a big problem and cant solve that:
i have a table (action) that store two id belong users in each row. one for customers and one for service providers.
name and family of these users are in another table (tablesite) that can be fetch. but i do not know how i can fetch either name and family of customers and also name of family of service_providers .
result should be like this:
example: first line service_provider_id is 33 and customer_id is 34
so i need this:
service_provider: sajad khammar --- customer: akbar ahmadi
SELECT
a.job_id,
CONCAT( s.name, ' ', s.family ) AS service_provider,
CONCAT( c.name, ' ', c.family ) AS customer
FROM action a
INNER JOIN tablesite s
ON a.service_provider = s.id_user
INNER JOIN tablesite c
ON a.customer_id = c.id_user
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so for an assignment I need to Find the manager(s) of the employee(s) who support customer(s) from Canada from the chinook data base
For now I have the following code:
select distinct employee.LastName, employee.EmployeeId, employee.ReportsTo
from customer,
employee
where customer.Country = 'Canada'
and customer.SupportRepId = employee.EmployeeId;
So I get the following results
So I need to get the names of the general manager whose EmployeeId is 2, but I don't know how to put it into one query.
This is an overview of all the employees:
This is an overview of all the customers:
You have to join the the employee table twice:
select distinct employee.LastName, employee.EmployeeId, manager.Lastname
from
customer
join employee as employee on customer.SupportRepId = employee.EmployeeId
join employee as manager on employee.ReportsTo = manager.employeeId
where customer.Country = 'Canada'
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I have 3 tables:
users (id_user)
achievements (id_achievement)
user_achievements (id_user, id_achievement)
I need help selecting every achievement that a user has not yet completed.
Consider a cross join that generates all combinations of users and achievements, and a not exists condition with a correlated subquery to filter out those that were completed already:
select u.id_user, a.id_achievement
from users u
cross join achievements a
where not exists (
select 1
from user_achievements ua
where ua.id_user = u.id_user and ua.id_achievement = a.id_achievement
)
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Trying to understand SQL more as part of a POC I'm working on and have hit a snag. I have two select queries (shown below) and I want to combine these into a single query that:
Shows all of the results of query one
Joins the result of query two if the category column matches.
Provides a default of 0 if there is no match
Query one:
SELECT activityId, location, category, activityScore FROM activities WHERE location = "manchester";
Query two:
SELECT userId, category, userScore FROM userscore s WHERE userId = "32976428";
Expected Output:
The resulting query should show all activities in "manchester" along with the associated userScore if the specified use has one that matches that category. If there is no userscore then 0 should be returned instead.
Thanks for any help.
Carl
I think you need a LEFT JOIN on your userscore table
SELECT a.activityId, a.location, a.category, a.activityScore,
s.userId, ISNULL(s.userScore,0) as userScore
FROM activities a
LEFT JOIN userscore s ON s.category = a.category AND s.userId = "32976428"
WHERE a.location = "manchester";
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I want to display result having data categorized in the group with their latest message according to date.
I tried grouping and having along with nested queries but no luck.
SELECT groupName,date FROM chat where groupName like '%he%' group by groupName,date having min(date);
I want the two rows to be printed along having the latest message with them.Here it would be row 4 and row 5. this is just an arbitrary data though which I need to impplement on bulk.
You don't need group by, just filtering:
select c.*
from chat c
where c.date = (select max(c2.date) from chat c2 where c2.groupname = c.groupname);
You can do it with NOT EXISTS:
SELECT c.*
FROM chat c
WHERE
groupName LIKE '%he%'
AND
NOT EXISTS (
SELECT 1 FROM chat
WHERE groupname = c.groupname AND date > c.date
)
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I have three tables say 'user', 'user_resources' and 'desktop_resources'.
'user' contains - emp_id,name and other attributes
'user_resources' - emp_id and desktop_id foreign key relation
'desktop_resources' - desktop_id and other attributes
Now i want a sql query from where i can get a table which shows me name from 'user' table and 'desktop_resources' attributes only where "emp_id=d_id"
how to go about it??
I don't see d_id column there, but if you think so, it would look like this:
SELECT name, desktop_resources.*
FROM desktop JOIN user_resources USING (desktop_id) JOIN user USING (emp_id)
This is a straightforward series of joins:
select u.name, dr.*
from user u
join user_resources ur on ur.emp_id = u.emp_id
join desktop_resources dr on dr.desktop_id = ur.desktop_id
where u.emp_id = $d_id
Finally found this query useful:
SELECT name, desktop.*
FROM desktop
NATURAL JOIN (
user
JOIN user_resource ON user.emp_id = user_resource.emp_id
)
I am sure there may be other ambiguous queries for this..if u have got a better query..please put it in comments...