output the column name with the highest value

问题

I have a lot of columns with numbers in them in a SQL Server table. I need to check the specific columns for the highest number and output the name of the column for each row in the table.

For example:

RED | BLUE | GREEN | BLACK | Highest Column

0      2       1       4         BLACK <-- Outputted result of an expression

I have a dataset that pulls all the columns from the database table. I need an expression that will evaluate the data and return the highest valued column name.

I'm not sure of the logic behind this type of situation. Any help would be appreciated.

This is an SSRS report.

回答1:

Use CROSS APPLY. This will give you the highest valued color(black):

DECLARE @t table(red int, blue int, green int, black int)-- | Highest Column
INSERT @t values(0,2,1,4)

SELECT red, blue, green, black, highest 
FROM @t -- replace @t with your own table
CROSS APPLY
(SELECT top 1 color highest
FROM
  (VALUES('RED', red), ('BLUE', blue), 
  ('GREEN', green), ('BLACK', black)) x(color, value)
ORDER BY value desc) x

It should be quite easy to replace @t with your own table.

来源：https://stackoverflow.com/questions/30598895/output-the-column-name-with-the-highest-value