Question

In my MySQL what is the difference between using the word JOIN or using: table1.id=table2.id

Table 1
id  name
1   John Lennon

Table 2
id  position
1   Singer

//What is the difference then calling JOIN?

Select name, position
From Table1, Table2
Where Table1.id=Table2.id;

Answer 1

There is none as long as there are only two tables. When there are more, you might get different JOIN order than expected, if you use comma to separate tables.

From manual:

INNER JOIN and , (comma) are semantically equivalent in the absence of
a join condition: both produce a Cartesian product between the
specified tables (that is, each and every row in the first table is
joined to each and every row in the second table).

However, the precedence of the comma operator is less than of INNER
JOIN, CROSS JOIN, LEFT JOIN, and so on. If you mix comma joins with
the other join types when there is a join condition, an error of the
form Unknown column ‘col_name’ in ‘on clause’ may occur. Information
about dealing with this problem is given later in this section.