I know this question has been asked before but I've been trying the solutions and I'm still getting errors.

I've created a view to view the quantity of life jackets by size:

---------------LIFE JACKET LIST------------

CREATE VIEW Life_Jacket_List AS

SELECT size,SUM(quantity) AS Quantity

FROM life_jackets LEFT JOIN equipment USING(model)

GROUP BY size with ROLLUP

Which looks like this:

Basically I just want to change the "null" to "Total". Here is what I've done so far:

CREATE VIEW Life_Jacket_List AS

SELECT size, size = ISNULL(size, ‘Total’), TotalLife = SUM(quantity), SUM(quantity AS Quantity

FROM life_jackets LEFT JOIN equipment USING(model)

GROUP BY size with ROLLUP

I'm getting an error though:

1582 - Incorrect parameter count in the call to native function 'ISNULL'

Any idea on how to fix this?