Update row with select on same table

Question

I\'m trying to update row with same table query. Context:

ID        |  LANG       |  TEXT
----------------------------------
1         |  EN         |  Hello         


        

Answer 1

For MS SQL you can use a join to do this, it might not work with other databases though:

UPDATE t1
SET t1.text = t2.text
FROM table1 t1
INNER JOIN table1 t2 ON t1.id = t2.id 
WHERE t1.TEXT IS NULL AND t2.LANG = 'EN'

Sample SQL Fiddle