Databases
StackOverflow2013
Postsdbo
POGet sql max datetime of multiple rows
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POGet sql max datetime of multiple rows
    primarykey
    data
    text
    <p>This statement returns 2 rows:</p> <pre><code>SELECT ts.UnitId,ts.TeststepId, MAX(ts.CreatedAt)as CreatedAt FROM Teststep ts INNER JOIN Unit u ON ts.UnitId = u.UnitId Where u.TemplateId = 2 Group by TeststepId, ts.UnitId </code></pre> <p>How can I get the one row with the highest <code>CreatedAt</code> date ? Should I distinct the <code>unitId</code>?</p> <p><strong>UPDATE</strong></p> <p>Aaron and flem aksed for more info:</p> <pre><code>1 Template has N Units 1 Unit has N Teststeps </code></pre> <p>The clustered primary key of the Teststep table is TeststepId and CreatedAt. </p> <pre><code>[TeststepId] [int] NOT NULL, [Name] [nvarchar](50) NOT NULL, [PreCondition] [nvarchar](500) NOT NULL, [TestInstruction] [nvarchar](500) NOT NULL, [ExpectedResult] [nvarchar](500) NOT NULL, [CreatedAt] [datetime] NOT NULL, [CreatedBy] [nvarchar](50) NOT NULL, [UnitId] [int] NOT NULL, </code></pre> <p>The <strong>Teststep</strong> table</p> <p>sample data with the most important fields in the Teststep table could be:</p> <p><img src="https://i.stack.imgur.com/9OCUp.png" alt="enter image description here"></p> <p>The teststep shows historized teststeps. From the above image you see that the TeststepId = 4 exist 2 times. A historized version (58 sec.) and a current version (59 sec.).</p> <p>I want to get only the teststepid 4 with 59 seconds to show in a "current" View.</p> <p><strong>UPDATE 2</strong></p> <p>I want to get only the teststepid 4 with 59 seconds AND all other teststepId<code>s with their current date. If there are only rows with different teststepid</code>s take those because they are the current rows.</p> <p>I am just about to change my integration test and find about the solution.</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USsebenalern
    1. USElisabeth
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POGet sql max datetime of multiple rows
      1. This table or related slice is empty.
      1. VTDownMod
    2. VO
      singulars
      1. POGet sql max datetime of multiple rows
      1. This table or related slice is empty.
      1. VTDownMod
    3. VO
      singulars
      1. POGet sql max datetime of multiple rows
      1. This table or related slice is empty.
      1. VTDownMod
    1. COCan you expand on what you are actually trying to achieve? e.g. What happens when there are more than units?
      singulars
      1. POGet sql max datetime of multiple rows
      1. USPaul Fleming
    2. COAgreed with @flem - do you want "the one row", or do you want one row ***PER UNITID***? Can you please specify so we know which question we're answering, and can you also specify the version of SQL Server?
      singulars
      1. POGet sql max datetime of multiple rows
      1. USAaron Bertrand
    3. CO@Aaron I updated my question. Your solutions both work, question is which one is faster. Usually there will not exist more than 20 teststeps with the same id but different dates. So i guess the orderby clause is faster than the CTE.
      singulars
      1. POGet sql max datetime of multiple rows
      1. USElisabeth
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload