For clarity - unless you are also performing differential backups then a regular full backup is the same as a copy only backup.  The reason you want to take a...

Yes - transaction log backups are not dependent on anything in a full backup and can be applied to copy only or non-copy only full backups.  What you cannot do...

You should also look into page compression for those tables - not sure if that is available in 2012 for all versions, but if so it could save a lot...

Much easier to just use a FULL OUTER JOIN:

SELECT
    SNO = COALESCE(S1.SNO, S2.SNO)
   ,S2.[NAME]
   ,S2.PRODUCT
   ,S2.AMOUNT
  ...

If you knew there were specific objects that were candidates - you could have specified only those objects in the criteria.  That would capture every time one of those objects...

Since backups on a secondary node must be copy_only backups - you have to make sure copy only is set.  Once you do that - Ola's utility will look at...

Assuming SNO is the unique identifier - use an outer join to the old snapshot and filter on any of the columns that have changed.

SELECT n.sno
 ...

Unless I am missing something - you are trying to use an extended event to scan all SQL text executed on the instance and filtering that down for code running...

When you add additional files to a file group - SQL Server uses a proportional fill algorithm.  You can review further here: https://learn.microsoft.com/en-us/sql/relational-databases/databases/database-files-and-filegroups?view=sql-server-ver16

The ideal scenario is to have files all...

The documentation shows what permissions are granted: https://learn.microsoft.com/en-us/sql/relational-databases/security/authentication-access/database-level-roles?view=sql-server-ver16

As for changing system objects - no.

From the above documentation sp_dbfixedrolepermission displays permissions of a fixed database role.

Yeah, but in the actual question the OP asks for those students that turned in the assignment for all dates.

You do need an outer join with the dates students are expected to have turn-ins in order to accommodate a very naughty class that has conspired with each other...

I think all that is needed for this is a GROUP BY and HAVING count(*) = 3.  If you need it to be dynamic - then you need to determine...

Regardless of whether you have an AOG listener, you can connect directly to either the primary or secondary using a connection string similar to that below. If connecting to...

If someone hacked your system - they probably did not get access to SQL Server through the account running SQL Server.  That account is a virtual account and will be...