SQL updating multiple rows in 1 table - sql

Question

I have a question. I am using MS SQL Server Management Studio by the way.
I have a Dictionary table with a lot of translations. I need to copy a complete description from a languageID to another languageID.
Example below.
LanguageID | Description
2 | Some text
2 | More text
2 | Some more text
10 | *needs to be replaced
10 | *needs to be replaced
10 | *needs to be replaced
The result must be like this:
LanguageID | Description
2 | Some text
2 | More text
2 | Some more text
10 | Some text
10 | More text
10 | Some more text
The description of LanguageID 2 and 10 must be exactly the same.
My current Query runs into an error:
update tblDictionary
set Description = (Select Description from tblDictionary where
tblDictionary.LanguageID = 2)
where LanguageID = 10
Msg 512, Level 16, State 1, Line 1 Subquery returned more than 1
value. This is not permitted when the subquery follows =, !=, <, <= ,
, >= or when the subquery is used as an expression. The statement has been terminated.

Answer 1

If all translations for LanguageID 10 must be exact the same as for languageID 2 then its easier to delete all translations for ID 10 and then insert them back again.
Something like this
delete from tblDictionary where LanguageID = 10;
insert into tblDictionary (LanguageID, Description)
select 10, d.Description
from tblDictionary d
where d.LanguageID = 2
This method also has the advantage that if there are less records with LanguageID = 10 then there are for LanguageID = 2 this will be corrected in the same process.
If you have more columns in tblDictionary than you will need to modify the insert statement off course

Answer 2

DECLARE #temp varchar(50)
DECLARE language_cursor CURSOR FOR
SELECT Description FROM tblDictionary
WHERE LanguageID = 2
ORDER BY Description;
OPEN language_cursor;
-- Perform the first fetch.
FETCH NEXT FROM language_cursor
into #temp;
-- Check ##FETCH_STATUS to see if there are any more rows to fetch.
WHILE ##FETCH_STATUS = 0
BEGIN
update TOP (1) tblDictionary
set Description = #temp
where Description = ''
and LanguageID = 10;
FETCH NEXT FROM language_cursor
into #temp;
END
CLOSE language_cursor;
DEALLOCATE language_cursor;
Set all languageID 10 to empty first, then loop all description from languageID 2 to update into languageID 10 one by one until all empty description from languageID10 is filled.

Answer 3

Now if you really want an update, something like this should work, even though I think the structure of the table needs to be improved.
WITH l2 AS
(SELECT *,
ROW_NUMBER() OVER(PARTITION BY LanguageId ORDER BY Description ASC) AS No FROM tblDictionary WHERE LanguageId=2),
l10 AS
(SELECT *,
ROW_NUMBER() OVER(PARTITION BY LanguageId ORDER BY Description ASC) AS No FROM tblDictionary WHERE LanguageId=10)
UPDATE l10 SET Description = l2.Description
FROM l10
INNER JOIN l2 ON l10.No = l2.No