Question

Possible Duplicate:
Explicit vs implicit SQL joins
Is there a difference using join andselect from multi-tables?
SQL Joins: Future of the SQL ANSI Standard (where vs join)?

What is the difference between JOIN and declaring multiple tables in the FROM clause?

Such as:

SELECT *
FROM  table1 AS t1,
      table2 AS t2
WHERE t1.id = t2.id

Compared to:

SELECT *
FROM table1 AS t1
INNER JOIN table2 AS t2 ON t2.id = t1.id

Answer 1

The second version, with the explicit JOIN and join condition is standardized SQL.

The implicit join syntax with a WHERE clause is deprecated syntax (or, rather, considered bad) – partially because it is easy to forget the WHERE clause and cause a Cartesian product.