SQL | Calculations using dates exercise | Use the DATENAME function and CASE to display full dates

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Software ==> SQL  (198 exercises)
Version ==> Any version of SQL Server
Topic ==> Calculations using dates  (4 exercises)
Level ==> Harder than average
Subject ==> SQL training
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Create a query to show the full dates for any event:

Full list of dates

The first few events, in chronological order.

To get the suffix, you'll need to use a CASE statement based on the day number for any date.

Save this query as Query suffices (marvelling at the wordplay involved in the title), then close it down.

You can unzip this file to see the answers to this exercise, although please remember this is for your personal use only.
This page has 2 threads Add post
09 May 21 at 10:55

select   EventName as [Event Name]
        ,concat(datename(weekday,EventDate),' ' 
        ,case when datepart(day,EventDate) in (1,21,31) 
        then convert(varchar,datepart(day,EventDate))+'st'
        when datepart(day,EventDate) in (2,22) 
        then convert(varchar,datepart(day,EventDate))+'nd'
        when datepart(day,EventDate) in (3,23) 
        then convert(varchar,datepart(day,EventDate))+'rd'
        else convert(varchar,datepart(day,EventDate)) +'th'
        end ,' ' 
        ,datename(month, EventDate) ,' ' 
        ,year(EventDate)) as [Full Date]
from [dbo].[tblEvent]

10 Apr 20 at 02:12

Why do we need to use the CASE function?
What's wrong with this:

SELECT EventName, EventDate, ( (DATENAME(Weekday, EventDate)) + ' ' + (DATENAME(day, EventDate)) + 'th ' + (DATENAME(month, EventDate)) + ' ' + (DATENAME(year, EventDate)) ) AS 'Full Date'
FROM [tblEvent]
ORDER BY EventDate

09 May 21 at 11:04

Please check your "1st", "2nd", "3rd", "4th" etc.

18 Dec 20 at 18:47

SELECT EventName
    ,CASE WHEN DATEPART(day,EventDate) IN (1,21,31) THEN CONCAT(DATENAME(weekday,EventDate),' ',DATEPART(day,EventDate),'st ',DATENAME(month,EventDate),' ',DATEPART(year,EventDate)) 
          WHEN DATEPART(day,EventDate) IN (2,22) THEN CONCAT(DATENAME(weekday,EventDate),' ',DATEPART(day,EventDate),'nd ',DATENAME(month,EventDate),' ',DATEPART(year,EventDate)) 
          WHEN DATEPART(day,EventDate) IN (3,23) THEN CONCAT(DATENAME(weekday,EventDate),' ',DATEPART(day,EventDate),'rd ',DATENAME(month,EventDate),' ',DATEPART(year,EventDate)) 
          ELSE  CONCAT(DATENAME(weekday,EventDate),' ',DATEPART(day,EventDate),'th ',DATENAME(month,EventDate),' ',DATEPART(year,EventDate))
    END as FullDate
FROM tblEvent

10 Apr 20 at 12:07

That answer will work for most dates, but won't for 1st, 2nd, 3rd, 21st, 22nd and 23rd.  

13 Apr 20 at 13:01

True that.