Question

i have a table with data like this (table A)

id | key  | status
-----------------
1  | dg12 | done
2  | dg12 | 

and like this (table B)

id   | Name  | status
------------------
dg12 | Dummy | 

i want to update table B status with this condition

if table A status in row 1 and 2 (i means not containing ” ” value) is done then dg12 status in table B is done…

how can i do that?? using php+mysql, anyone can help please??
thanks before

Answer 1

UPDATE 
    tableB AS b
SET 
    b.status = 'done'
WHERE 
    (SELECT COUNT(*) FROM tableA AS a WHERE a.key = b.id) 
    = 
    (SELECT COUNT(*) FROM tableA AS a WHERE a.key = b.id AND a.status = 'done')

OR

UPDATE 
    tableB AS b
SET 
    b.status = 'done'
WHERE 
    (SELECT COUNT(*) FROM tableA AS a WHERE a.key = b.id AND a.status != 'done') = 0