Number of rows in multiple tables

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Yes, it's fairly straightforward.

select 'Customers' as tablename
     , count(*) as row_count
  from Customers
union all
select 'Orders' as tablename
     , count(*) as row_count
  from Orders
union all
select 'Products' as tablename
     , count(*) as row_count
  from Products
union all
...

If you need to run this for all tables in your database, you can generate the list of tables from the INFORMATION_SCHEMA.TABLES view:

select table_name
  from information_schema.tables
 where table_schema = 'mydatabase'

Then you can use the result set of this query along with a text editor to generate the first query.