max(length(field)) in mysql

Question

If I say:

select max(length(Name)) 
  from my_table

I get the result as 18, but I want the concerned data also. So if I say:

s         


        

Answer 1

select * 
from my_table 
where length( Name ) = ( 
      select max( length( Name ) ) 
      from my_table
      limit 1 
);

It this involves two table scans, and so might not be very fast !

Answer 2

Ok, I am not sure what are you using(MySQL, SLQ Server, Oracle, MS Access..) But you can try the code below. It work in W3School example DB. Here try this:

SELECT city, max(length(city)) FROM Customers;

Answer 3

Use:

  SELECT mt.name 
    FROM MY_TABLE mt
GROUP BY mt.name
  HAVING MAX(LENGTH(mt.name)) = 18

...assuming you know the length beforehand. If you don't, use:

  SELECT mt.name 
    FROM MY_TABLE mt
    JOIN (SELECT MAX(LENGTH(x.name) AS max_length
            FROM MY_TABLE x) y ON y.max_length = LENGTH(mt.name)