0 come last when sorting ascending - sql

Question

I am trying to select from one table a list of products ordered by price, year, name, and others....
The problem is that I must make zero values come last when sorting ascending.
My code is:
SELECT * FROM Product P
ORDER BY CASE WHEN #OrderBy='Date ASC' THEN Date END ASC,
CASE WHEN #OrderBy='Price ASC' THEN Price END ASC,
CASE WHEN #OrderBy='Title ASC' THEN Title END ASC,
CASE WHEN #OrderBy='' THEN Match END
This works but don't put the zero at the bottom of the list.
So, I tried to transform it (see next code), but it gave me the error Incorrect syntax near ','.
SELECT * FROM Product P
ORDER BY CASE WHEN #OrderBy='Price ASC' THEN
(case A.Price WHEN 0 THEN 1 ELSE 0 END,A.Price )
END ASC
I appreciate any help

Answer 1

You can do it by testing for price-ordering twice:
SELECT * FROM Product P
ORDER BY CASE WHEN #OrderBy='Date ASC' THEN Date END ASC,
CASE WHEN #OrderBy='Price ASC' THEN CASE WHEN Price = 0 THEN 1 ELSE 0 END ASC,
CASE WHEN #OrderBy='Price ASC' THEN Price END ASC,
CASE WHEN #OrderBy='Title ASC' THEN Title END ASC,
CASE WHEN #OrderBy='' THEN Match END
By the way, the implicit value of the case expression when #orderBy doesn't equal the string is null. When the sort column contains all nulls, it effectively disables sorting for that attribute.

Answer 2

I would suggest using a large dummy price:
ORDER BY CASE WHEN #OrderBy='Price ASC' THEN 99999999 ELSE A.Price END ASC
or if you DBMS supports NULLS LAST:
ORDER BY CASE WHEN #OrderBy='Price ASC' THEN NULLIF(A.Price,0) END ASC NULLS LAST

Answer 3

You can try with this syntax:
SELECT *,
CASE WHEN #OrderBy = 'Price ASC' AND Price = 0 THEN 1 ELSE 0 END AS OrderPriceZeroLast
FROM Product P
ORDER BY OrderPriceZeroLast,
CASE WHEN #OrderBy = 'Date ASC' THEN Date END ASC,
CASE WHEN #OrderBy = 'Price ASC' THEN Price END ASC,
CASE WHEN #OrderBy = 'Title ASC' THEN Title END ASC,
CASE WHEN #OrderBy = '' THEN Match END

Answer 4

I can't add comments yet. There is bug in your code
SELECT * FROM Product P
ORDER BY CASE WHEN #OrderBy='Price ASC' THEN
(case A.Price WHEN 0 THEN 1 ELSE 0 END,A.Price )
END ASC
Shoud be smth like
SELECT *
FROM Product P
ORDER BY
CASE
WHEN #OrderBy='Price ASC'
THEN
CASE A.Price
WHEN 0
THEN 1
ELSE 0
END
END,
A.Price

Answer 5

This may seem like a hack but you could create a new column on the result set on the fly. Like this:
SELECT *, [name of column that may contain zeroes] as foo WHERE /* rest of your code */
Then you could sort DESC on foo and ASC on the rest. Just remember to now show foo to the user. Also notice that yes, you'll get the same column in the result set twice. You also have to use a CASE to turn all non-zero values into 1 (or some other constant value).

Answer 6

Try this to sort 0 value to last, when there are 0,1,2,... values are in field.
It will bring 1, 2 ,... and 0 to last order.
select * from Product
order by
case
when OrderBy = 0
then -1
else 0
end,
OrderBy desc
-Chirag