如何在存储过程查询中定义变量？

Question

I am newbie to Stored Procedures. how can I define a variable to be used inside a sql query? here is my code but when I run this stored procedure I get this error:

An expression of non-boolean type specified in a context where a condition is expected, near 'or'.

this is my code:

 declare @sql nvarchar(MAX)
    Declare @availabilityStatus nvarchar(MAX)
    BEGIN
            IF @Availability = 1
                set @availabilityStatus = '0 or 1 or 2'
            ELSE
                set @availabilityStatus = '1'
            set @sql = 
                'SELECT Distinct P.ProductId, P.BrandId, P.[' + @OrderIndex + ']  FROM Products P INNER JOIN ProductStores PS ON P.ProductId = PS.ProductId ' +
                'Where PS.StoreId = @StoreId and (PS.Status = ' + @availabilityStatus + 'or PS.AvailabilityRank < '

this @Availability variable is an input that I have defined at the beginning of the stored procedure.

Answer 1

An IN clause will work nicely here as it will work for both single values and a comma-separated list of values..

 CREATE PROC YourProcName (@Availability int) AS declare @sql nvarchar(MAX) Declare @availabilityStatus nvarchar(MAX) BEGIN IF @Availability = 1 set @availabilityStatus = '0, 1, 2' ELSE set @availabilityStatus = '1' set @sql = 'SELECT Distinct P.ProductId, P.BrandId, P.[' + @OrderIndex + '] FROM Products P INNER JOIN ProductStores PS ON P.ProductId = PS.ProductId ' + 'Where PS.StoreId = @StoreId and PS.Status IN (' + @availabilityStatus + ') or PS.AvailabilityRank < ' -- the rest of your @sql code -- the rest of your code END GO 

Answer 2

您是否尝试添加方括号，例如(@Availability = 1) ？