SQL:WHERE 子句多个条件

Question

SELECT
    ((1.0 * (SELECT SUM(r.SalesVolume) 
             FROM RawData r
             INNER JOIN Product p ON r.ProductId = p.ProductId
             WHERE p.Distributor = 'TF1', 'WARNER')
GROUP BY p.Distributor)
/
(SELECT SUM(r.SalesVolume) FROM RawData r)*100)
;

上面的查询给出了一个错误:

Lookup Error - SQL Server Database Error: Incorrect syntax near ','.

谁能指出问题所在？我知道在这种情况下我不能使用 OR/AND 条件。结果集必须有 2 行。

产品:

Distributor     
  WARNER              
  TF1                 
  WARNER              
  TF1  

原始数据:

   SalesVolume
        5
        6
        3
        4

Answer 1

也许 IN 而不是 =

SELECT
((1.0*(SELECT SUM(r.SalesVolume) FROM RawData r
INNER JOIN Product p
ON r.ProductId = p.ProductId
WHERE p.Distributor in ('TF1','WARNER'))
/
(SELECT SUM(r.SalesVolume) FROM RawData r)*100)
;