different ways of writing inner join in sql code example

Example 1: two inner joins

SELECT 
  c.*, i.*, a.* 
FROM 
  invoices i 
INNER JOIN 
  client c 
ON 
  i.clientid = c.clientid 
INNER JOIN 
  address a 
ON 
  a.clientid = c.clientid 
WHERE 
  i.id = 21

Example 2: sql inner join

SELECT column_name(s)
FROM table1
INNER JOIN table2
ON table1.column_name = table2.column_name;