This sounds like you're opening SSMS (SQL Server management studio), which depending on the version you've installed could well be a standalone application.

Do you have an application called...

You should really post SQL that doesn't rely on User languages. i can't run the above as I'm British (there aren't 31 months in the year). Ideally supply dates in...

Duplicate of topic https://www.sqlservercentral.com/Forums/1857023/Every-day-count-of-Inventory?Update=1#bm1857267. Please direct further answers there.

Just noticed you duplicated this topic here: https://www.sqlservercentral.com/Forums/1857105/RE-Count-Difference-for-Every-15-Min#bm1857132 I've answered your questions there, I believe. Please direct your answer to this topic though, don't create two topics for one...

SELECT ID
FROM #Sample S
WHERE S.StartDate = (SELECT MIN(sq.StartDate) FROM #Sample sq);

The DDL and DLM you've provided is for Oracle, not  SQL, so we can't use it.

But why do wyou WANT to do do it in string? It would...

Still no DDL, so I've had to guess your field names, and untested as no DLM, but maybe:
WITH CTE AS(
  SELECT l.Locaton AS CountryIndicator,
    ...

Really need to see the error behind it (you have remote error disabled so I have no idea what the error is). Unfortunately without a true error I'm going to...