Select from multiple table (passed by another select) - sql

Question

Question updated.
What I want to achive is to get list of new tables which are empty or null in description field. (new tables means with prefix new_) and all tables have description field.
Table definition:
create table topic (id int, description varchar(255));
create table comment (id int, description varchar(255));
create table author (id int, description varchar(255));
create table new_topic (id int, description varchar(255));
create table new_comment (id int, description varchar(255));
create table new_author (id int, description varchar(255));
Sample data and description:
insert into new_topic (id, description) values (1, null);
insert into new_topic (id, description) values (2, 'This is topic description');
insert into new_comment (id, description) values (1, null);
insert into new_comment (id, description) values (2, null);
insert into new_author (id, description) values (1, 'This is casual first author.');
insert into new_author (id, description) values (2, 'This is casual second author.');
Like you can notice on my example ideal output for my sample data would've be:
table_name:
new_topic
new_comment
My actual solution works, but I need to manually add tables and I make a lot of repetitions.
select distinct 'new_topic' as table_name
from new_topic where description is null
select distinct 'new_comment' as table_name
from new_comment where description is null
select distinct 'new_author' as table_name
from new_author where description is null
And output of my solution is like below:
table_name
new_topic
table_name
new_comment
table_name
I also created SELECT to get all new tables:
SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_NAME LIKE 'new_%' AND TABLE_TYPE = 'BASE TABLE'
Which could've be an entry point for my previous select, but I don't know how to connect those two.
Also my solution is avaiable on dbfiddle

Answer 1

Oh I think I understand what you are after. Yes this requires dynamic sql. Also, please note that your query to find all tables with a name like new_ is not quite right. The underscore is a wildcard pattern check. So that would return a table named "news" when you don't want it to. Wrap the underscore in square brackets to solve this. Here is how I would go about this type of query. The comments in the code should explain this.
declare #SQL nvarchar(max) = '' --this must be initialized to an empty string for this to work.
select #SQL = #SQL + 'select distinct TableName = ''' + t.name + ''' from ' + quotename(t.name) + ' where description is null union all '
from sys.tables t
where name like 'new[_]%' --need the square brackets because the underscore is a wildcard so you might get false positives
select #SQL = left(#SQL, len(#SQL) - 10)
--this will show you the dynamic sql
select #SQL
--once you are satisfied the dynamic sql is correct uncomment the next line to execute it
--exec sp_executesql #SQL

Answer 2

Could you not just do:-
select table_name from information_schema.columns
where table_name like 'prefix_%' and (column_name is null or column_name='')