I have got only the .ibd (eg: users.ibd) files of the table names in the MySql data directory, there is no other file extension of the table is available (eg: .frm or .cfg).

I recently upgrade mySQL 5.6 to 5.7 to 8
currently they’re working as chain replication but that’s not the case
for some table that I create in mySQL 5.7 im getting row size error in mysql 8, for exmaple:

I used below command to grant select PRIVILEGES on specific columns of one MYSQL DB table.

I try to understand the following problem. I have a table, let it be A, where ID field is varbinary(50).
Then trying to select from this table:

I try to understand the following problem. I have a table, let it be A, where ID field is varbinary(50).
Then trying to select from this table:

I want to design a database for the SCM system.
SCM Features:

I mistakenly dropped a table in my database why trying to copy a table from one database to another using these queries

These are my tables:
Students

I am currently keeping track of which users download which item from the object1 table so my table looks something like this:

What is easiest and effective way to fetch data based on time Zone.