Question

I have two table like

id   Name    allocation
2    Ash      15
3    Alam     18
4    Rifat    20

and

Date   Id    Present
24     2     10
24     3     15
25     2     10
25     3     12
25     4     12

Now i want to get the following result

     Date  Id Alloc   Present
      24   2   15     10        
      24   3   18     15
      24   4   20     NULL
      25   2   15     10
      25   3   18     12
      25   4   20     12

I’ve tried JOIN query but it does not give desired result
How to get the above result?

Answer 1

SELECT 
    t1.id
  , dd.date
  , t1.allocation
  , t2.present 
FROM 
    table1 AS t1                         --- all items
  CROSS JOIN
    ( SELECT DISTINCT date
      FROM table2
    ) AS dd                              --- all dates
  LEFT JOIN
    table2 AS t2                         --- present allocations
      ON  t2.id = t1.id
      AND t2.date = dd.date ;

Tested at SQL-Fiddle: test (thank you @JW.)