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limiting query results in a table join


limiting query results in a table join

By : Deric Hellwig
Date : November 17 2020, 11:55 AM
it helps some times You'll get more and better answers if you include CREATE TABLE and INSERT statements in your question.
code :
create table table_hta (
  order_id integer primary key,
  employee_id integer not null,
  status varchar(10) not null,
  delivery_date datetime not null
);

insert into table_hta values
(1, 23, 'OTD', '2015-01-01 3:45'),
(2, 24, 'DELIVER', '2015-01-01 3:50'),
(3, 25, 'DELIVER', '2015-01-01 3:51');

create table table_employees (
  employee_id integer primary key,
  employee_first varchar(10) not null
);

insert into table_employees values
(23, 'Bob'),
(24, 'James'),
(25, 'Henry'),
(26, 'Sally');
select employee_id 
from table_employees
where employee_id not in (select employee_id
                          from table_hta
                          where status = 'OTD');
select e.employee_id, e.employee_first, h.delivery_date
from table_employees e
left join (select employee_id, max(delivery_date) as delivery_date 
           from table_hta group by employee_id) h 
       on e.employee_id = h.employee_id
where e.employee_id not in (select employee_id 
                            from table_hta 
                            where status = 'OTD');
order_id |  employee_id | status | delivery_date |
       1 |     24       |  OTD   | 1/1/15 3:45pm
       2 |     24       |DELIVER | 1/1/15 3:50pm


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Limiting Results on Join Query

Limiting Results on Join Query


By : Fan William
Date : March 29 2020, 07:55 AM
I wish did fix the issue. The most flexible way to write this, which doesn't require a correlated subquery, is to use ROW_NUMBER (SQL Server 2005+ only):
code :
;WITH Names_CTE AS
(
    SELECT
        ID, RefNumber, Forename, Surname,
        ROW_NUMBER() OVER (PARTITION BY RefNumber ORDER BY ID) AS RowNum
    FROM Names
)
SELECT o.RefNumber, o.Charge, o.IssueDate, n.Forename, n.Surname
FROM Orders o
[INNER|LEFT] JOIN Names_CTE n
    ON n.RefNumber = o.RefNumber
WHERE n.RowNum = 1
SELECT o.RefNumber, o.Charge, o.IssueDate, n.Forename, n.Surname
FROM Orders o
[INNER|LEFT] JOIN
(
    SELECT RefNumber, MIN(ID) AS MinID
    FROM Names
    GROUP BY RefNumber
) m
    ON m.RefNumber = o.RefNumber
[INNER|LEFT] JOIN Names n
    ON n.ID = m.MinID
Select inner join many-to-one relationship limiting number of results for child table

Select inner join many-to-one relationship limiting number of results for child table


By : NinjaGrunt
Date : March 29 2020, 07:55 AM
wish help you to fix your issue Use a CROSS APPLY.
A CROSS APPLY allows you to
code :
SELECT  TableA.Name
        , b.Value
FROM    TableA
        CROSS APPLY (
          SELECT  TOP 10 *
          FROM    TableB
          WHERE   TableA.Id = TableB.TableA_Id
          ORDER BY
                  TableB.Value
        ) b
WHERE   TableA.Name LIKE 'a%'        
Need help on join table, limiting results to only the resource ID

Need help on join table, limiting results to only the resource ID


By : Pete Kingston
Date : March 29 2020, 07:55 AM
wish of those help There are 2 ways I see that you can do this. The simpler approach (albeit less efficient in the sorting), would be to aggregate the sums by buyer_id and then inject that into the list of buyers:
code :
<% buyer_sums = @seller.trans.group(:buyer_id).sum(:sum) %>
<% Buyer.where(id: buyer_sums.keys).sort_by {|b| -buyer_sums[b.id]}.each do |buyer| %>
  <%= buyer.name %> <%= buyer_sums[buyer.id] %>
<% end %>
<% Buyer.joins(:trans).merge(@seller.trans).
         select("buyers.*, SUM(`sum`) sums").order('SUM(`sum`)').each do |buyer| %>
  <%= buyer.name %> <%= buyer.sums %>
<% end %>
SQL - Create a join / query based on the results of another query. The Join table would be from the results of another q

SQL - Create a join / query based on the results of another query. The Join table would be from the results of another q


By : Prajwal P Jain
Date : March 29 2020, 07:55 AM
wish help you to fix your issue I'm unsure why something like this wouldn't work. It gives you rows instead of columns...
code :
Select Sum(x.value), reference
from table_abc
where ID = @itemID
group by reference
Trying to join AspNetUsers table in LINQ query results in Type inference failed in the call to 'Join'

Trying to join AspNetUsers table in LINQ query results in Type inference failed in the call to 'Join'


By : Prashant Dubey
Date : March 29 2020, 07:55 AM
wish helps you Why am I not able to join my AspNetUsers table in a LINQ query ? , The error
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