075 Stored Procedure #1

SQL

--create
CREATE PROCEDURE sp_test1
AS
BEGIN
    select 
        C.Name as 'Category Name',
        SUM(ISNULL(OL.Quantity,0)) as 'Ordered Quantity',
        case
            when SUM(ISNULL(OL.Quantity,0)) between 1 and 9 then 'Low-demand'
            when SUM(ISNULL(OL.Quantity,0)) between 10 and 30 then 'Mid-demand'
            when SUM(ISNULL(OL.Quantity,0)) > 30 then 'High-demand'
            else 'No-demand'
        end as 'Demand Type'
    from Categories C
        left join Products P on C.CategoryId = P.CategoryId
        left join OrderLines OL on P.ProductId = OL.ProductId
    group by C.Name
    order by C.Name
END

EXEC sp_test1


--alter
ALTER PROCEDURE sp_test1
AS
BEGIN
    select 
        C.Name as 'Category Name 1',
        SUM(ISNULL(OL.Quantity,0)) as 'Ordered Quantity',
        case
            when SUM(ISNULL(OL.Quantity,0)) between 1 and 9 then 'Low-demand'
            when SUM(ISNULL(OL.Quantity,0)) between 10 and 30 then 'Mid-demand'
            when SUM(ISNULL(OL.Quantity,0)) > 30 then 'High-demand'
            else 'No-demand'
        end as 'Demand Type'
    from Categories C
        left join Products P on C.CategoryId = P.CategoryId
        left join OrderLines OL on P.ProductId = OL.ProductId
    group by C.Name
    order by C.Name
END

EXEC sp_test1

DROP PROCEDURE sp_test1

--paramaters
CREATE PROCEDURE sp_test1
    @categoryName as nvarchar(500)
AS
BEGIN
    select 
        C.Name as 'Category Name',
        SUM(ISNULL(OL.Quantity,0)) as 'Ordered Quantity',
        case
            when SUM(ISNULL(OL.Quantity,0)) between 1 and 9 then 'Low-demand'
            when SUM(ISNULL(OL.Quantity,0)) between 10 and 30 then 'Mid-demand'
            when SUM(ISNULL(OL.Quantity,0)) > 30 then 'High-demand'
            else 'No-demand'
        end as 'Demand Type'
    from Categories C
        left join Products P on C.CategoryId = P.CategoryId
        left join OrderLines OL on P.ProductId = OL.ProductId
    where c.Name = @categoryName
    group by C.Name
    order by C.Name
END

EXEC sp_test1 'fruit'

ALTER PROCEDURE sp_test1
    @categoryName as nvarchar(500)
AS
BEGIN
    
    SET NOCOUNT ON

    select 
        C.Name as 'Category Name',
        SUM(ISNULL(OL.Quantity,0)) as 'Ordered Quantity',
        case
            when SUM(ISNULL(OL.Quantity,0)) between 1 and 9 then 'Low-demand'
            when SUM(ISNULL(OL.Quantity,0)) between 10 and 30 then 'Mid-demand'
            when SUM(ISNULL(OL.Quantity,0)) > 30 then 'High-demand'
            else 'No-demand'
        end as 'Demand Type'
    from Categories C
        left join Products P on C.CategoryId = P.CategoryId
        left join OrderLines OL on P.ProductId = OL.ProductId
    where c.Name = @categoryName
    group by C.Name
    order by C.Name
END

EXEC sp_test1 'fruit'