Question

I have two tables: A, B. I need to select all data from B.
I could do this like

SELECT id, b1, b2, ... b20 FROM A,B WHERE A.id = B.id; 

it’s not cool solution. I will need to update this statement if I modify B’s database. Is exist something like ?

SELECT *(B) 

It selected all data from B and didn’t selected any data from A.

My databases

A
id
a1
a2
...
a20 

B
id
b1
b2
...
b20

Answer 1

So if you want create database seriously you shouldn’t see on complexity of way but on efficiency and speed. So my advice to you is use JOIN that is the best solution for selecting data from two and more tables, because this way is fast as possible, at least for my more cleaner like for example inserted select.

You wrote: I need to select all data from B this means SELECT * FROM B not that you wrote.

My advice to your is using this:

SELECT * FROM A <INNER / LEFT / RIGHT / NATURAL> JOIN B ON A.id = B.id;

or to select specific columns

SELECT A.column1, A.column2, ... FROM A <INNER / LEFT / RIGHT / NATURAL> JOIN B ON A.id = B.id;

Note:

NATURAL JOIN will work in above example since the primary key
and the foreign key in the two tables have the same name. So you must be very
careful in using NATURAL JOIN queries in the absence of properly
matched columns.

So you really should think about how you will create database and how you will working with database, how you will pulling data for View from database, how you will insert new potential data to database etc.

Regards man!