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

UPDATE TABLE
SET TEXT = (SELECT TOP 1 text WHERE id = table.id AND LANG ='EN' AND TEXT IS NOT NULL) --TOP 1 INCASE YOU HAVE DUPLICATES
WHERE TEXT IS NULL