MySQL multi table query_ Inner connection_ Show internal connections

-- Show syntax of inner connection ：
-- select Field name 1, Field name 2...from Table name 1 inner( It can be omitted )join Table name 2 on Connection condition
-- demand ： All information in the employee table is associated with the Department name of the query Department
SELECT 
  emp.*,
  dept.`name` 
FROM
  emp 
  INNER JOIN dept 
    ON emp.`dept_id` = dept.`id` ;
-- improvement ： Add an alias
SELECT 
  t1.*,
  t2.`name` 
FROM
  emp t1 
  JOIN dept t2 
    ON t1.`dept_id` = t2.`id` ;