logo
Tags down

shadow

What is the optimal way to get only latest ID's from table in SQL


By : user2174154
Date : October 18 2020, 08:10 PM
wish help you to fix your issue I'm trying to get only a single row per Appointment Number in a table storing a history of appointments. It works fine with a few rows but then gets slower? Is this the best way to do this kind of check and I'm just missing some indexes or is there a better way? , Solution 1:
code :
select * from (
    SELECT f1.*, row_number() over(partition by ApptNumber order by id desc ) rang FROM @temptable f1
) tmp where rang=1


Share : facebook icon twitter icon

Optimal performing query for latest record for each N


By : Java
Date : March 29 2020, 07:55 AM
Hope that helps Depends on your data (how many rows are there per group?) and your indexes.
See Optimizing TOP N Per Group Queries for some performance comparisons of 3 approaches.
code :
SELECT CA.*
FROM   Vehicles V
       CROSS APPLY (SELECT TOP 1 *
                    FROM   ChannelValue CV
                    WHERE  CV.VehicleID = V.VehicleID
                    ORDER  BY TimeStamp DESC) CA  

min-width on a table working on the latest of latest IE, Chrome, FF for windows but not Safari 5.1.7


By : Gratiandev
Date : March 29 2020, 07:55 AM
help you fix your problem This is similar to some questions that have been asked here before, such as this one: Safari and Chrome ignore min-width CSS propery. I'm using GWT to generate a layout in which I've used CSS to define a min-width on one of the panels (which turns out to be a style matched onto a table in the generated JS). It is working as expected on all of the latest IE, Chrome, FF, but not on the older Safari 5.1.7. , I check BrowserStack today, and it does work with 6.

Get all rows from table - with the latest row from another table, with another table based on the latest row


By : Marko Mitic
Date : March 29 2020, 07:55 AM
I wish this helpful for you I'd break this down by first getting the max(updated_at) for each order, then work to everything else you need. You can get the max date for each order by using subquery:
code :
select  
   s.`order`, 
   s.`status`,
   s.updated_at
from order_to_statuses s
inner join 
(
   select 
       `order`,
       max(updated_at) as updated_at
   from order_to_statuses
   group by `order`
) m
   on s.`order` = m.`order`
   and s.updated_at = m.updated_at
select 
    o.customer,
    o.product,
    ots.updated_at,
    os.name
from orders o
inner join
(
   select  
       s.`order`, 
       s.`status`,
       s.updated_at
   from order_to_statuses s
   inner join 
   (
       select 
           `order`,
           max(updated_at) as updated_at
       from order_to_statuses
       group by `order`
   ) m
       on s.`order` = m.`order`
       and s.updated_at = m.updated_at
) ots
    on o.Id = ots.`order`
inner join order_states os
    on ots.`status` = os.id;

Any other optimal way to update the parent table's columns when a child table is updated?


By : Fotis Kolytoumpas
Date : March 29 2020, 07:55 AM
Hope that helps Trigger is optimal (from a performance perspective) here; it's simply like running an update statement on a bunch of rows from the front end code. I don't see why you think there is a performance penalty. Your trigger code should look more like this though:
code :
CREATE TRIGGER TriggerName ON dbo.Info
AFTER INSERT, UPDATE
AS
BEGIN 
    SET NOCOUNT ON;
    UPDATE  dbo.Person
    SET     LastUpdatedBy = INSERTED.LastUpdatedBy ,
            LastUpdatedDate = INSERTED.LastUpdatedDate
    FROM    dbo.Person 
            INNER JOIN 
            INSERTED
            ON dbo.Person.PersonID = INSERTED.PersonID
END 
GO 

Get the latest row of a table based on Latest Date and a distinct column in SQL Server 2008 R2


By : dangermace
Date : March 29 2020, 07:55 AM
help you fix your problem If I have the following SQL Table , Perhaps the fastest way is :
code :
select t.*
from t
where t.colDate = (select max(t2.colDate) from t t2 where t2.colThree = t.colThree);
select t.*
from (select t.*,
             row_number() over (partition by colThree order by colDate desc) as seqnum
      from t
     ) t
where seqnum = 1;
Related Posts Related Posts :
  • how to sum up all time values on a given date?
  • Text Clause Explanation
  • SQL Server 2016 - Can't to log into SSMS after install
  • SQL Server table with different case in PowerShell SMO vs SSMS
  • Transpose and Create Variables
  • SQL : Output multiple left joined rows as one record for csv file
  • Removing Date From Date/Time Column
  • Subquery a Cast Function
  • Set based stacking update query
  • Can someone explain the `BypassPrepare` connection-parameter used when building an ETL via SSIS and VS?
  • How to join JSON with table?
  • Transforming a sql table into its inverse
  • Azure SQL Database Pricing
  • Log Reader error while adding a node in SQL Server peer to peer replication
  • Correct way to convert Month Name and Year to complete date SQL Server
  • Select records that appear twice, with a slight difference
  • tsql display value on first row of each group
  • shadow
    Privacy Policy - Terms - Contact Us © voile276.org