sql server - Replacement for scalar function by inline function -

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i have proc uses scalar function, in select statement twice described below.is better performance wise replace inline function when deal millions of records.if should it

create function getcategory (     @shopping_store char(4),     @cart_type      char(2),     @category_type  int,     @index_cat_type int ) returns int begin     if @shopping_store in ('1111','1222','3222') , @cart_type in ('120')         return -@category_type     else if @shopping_store in ('4333','54322') , @cart_type in ('120')         return @index_cat_type     else     begin         if @shopping_store in ('32214','5432','5654')             return @category_type         else             return -@index_cat_type     end      return @category_type end

all if elses can converted single case expression. lets convert scalar function inline table valued function. performance benefit of should substantial state have millions of rows. took liberty of changing @cart_type char(4) since garethd pointed out can't contain '120'. used explicit multiplication when wanting negative number because easy miss - @ beginning, clear when multiply negative 1.

create function getcategory (     @shopping_store char(4),     @cart_type      char(4),     @category_type  int,     @index_cat_type int ) returns table return     select case          when @shopping_store in ('1111','1222','3222') , @cart_type in ('120')              -1 * @category_type         when @shopping_store in ('4333','54322') , @cart_type in ('120')             @index_cat_type         when @shopping_store in ('32214','5432','5654')             @category_type         else             -1 * @index_cat_type     end categorytype

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