i would like to ask you if there is a way to get the value of maxlength of column in ms sql server.
For example in the table A we have:
id | value
----+--------
1 | 0123
2 | 00034567
3 | 547
The desired result for this data set is 00034567.
Wherever i have searched for this problem i get the answer select max(len(value)) which is not what i need, because it gives the max number of characters of the value and not the value itself.
Any ideas?
SELECT TOP 1 t.value
FROM table AS t
ORDER BY LEN(t.value) DESC
你使用的sql是正确的,你只需要将它转换为nvarchar
Sort by length and take the first row:
select top 1 value
from mytable
order by len(value) desc
If you want ties:
select value
from mytable
where len(value) = (select max(len(value)) from mytable)
Or more efficient but SQL Server specific:
select value from (
select value,
rank() over (order by len(value) desc) rank
from mytable) x
where rank = 1
See SQLFiddle for last one.
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