DROP TABLE IF EXISTS #Path;

CREATE TABLE #Path
(
    FilePath VARCHAR(200) NOT NULL
);

INSERT #Path
(
    FilePath
)
VALUES
('A:\AABCD\EDFG\RFG\MyDB123.bak')
,('A:\RFG\MyDB1123.bak')
,('A:\AABCD\EDFG\MyDB1223.bak');

SELECT p.FilePath
      ,LEFT(p.FilePath, CHARINDEX('MyDB',...

1. Then replication or backup/restore would seem reasonable options.
2. Probably. It would require some analysis and design work to decide on how best to handle all the changes, and in...

OK, now I understand why you wrote that.

Despite mention of the CS by the OP, my assumption was that this was a data flow containing multiple columns, one of which...

Are there lots of different tables being changed? If so, the answer is likely to be one of

1. Replication
2. Backup / Restore

If only a handful of table are being modified,...

I assume all you need it this:

LEN((DT_WSTR, 4) [Your Column]) == 4

If the values can also be longer than 4 characters as well increase the...

I understand, but most SQL devs (including me) try to avoid triggers, as they can become difficult to manage, and sometimes have unexpected side effects.

The above is such a complicated...

This sounds like business logic which should be handled in the stored proc which your front-end application calls when performing the INSERT.

Which is quite handy on those occasions where the...

I am looking to see if there are any ways to improve the run time for select queries.

This was the request I responded to. The remainder of your post provides...

Take a look in the Books section here too.

SELECT * FROM TABLE can't really be optimised, as far as I am aware. It's a full table scan.

(Even though you want all the columns, you should still name them,...

I suggest that you do it using this method (copied from https://sqlperformance.com/2020/09/locking/upsert-anti-pattern):

BEGIN TRANSACTION;
 
UPDATE dbo.t WITH (UPDLOCK, SERIALIZABLE) SET val = @val WHERE  = @key;
...

MSOLEDB is available:

In the application they would select, from a drop down one of the symbols (<,>,=,!=). I figured I can assigning them letters or numbers, if it is number one...

You'll have to use fully dynamic SQL to make this work.

Building arithmetic expressions like this is generally regarded as an anti-pattern in the T-SQL world. What is the underlying business...