SQL:减少结果集的大小

Question

SELECT p.Distributor, SUM(r.SalesVolume) as Sales, 
((Cast(SUM(r.SalesVolume) as decimal(14, 4)) / (SELECT SUM(r.SalesVolume) FROM RawData r)) * 100) as MarketSharesVolume
FROM RawData r
INNER JOIN Product p
ON r.ProductId = p.ProductId
WHERE p.Distributor in ('TF1','WARNER')
GROUP BY p.Distributor;

上述查询的结果是:

Distributor    Sales    MarketSharesVolume
  WARNER      2836192   58.131470300744400
  TF1         268668    5.506702600797200

基本上，我希望 MarketSharesVolume 的值类似于 58.1 我尝试更改精度 decimal(14, 4)，但其他所有组合都会给我带来 算术溢出错误。 有没有办法可以截断该列？

Answer 1

您可以转换列的数据类型:

       SELECT p.Distributor, SUM(r.SalesVolume) as Sales, 
    CAST( (Cast(SUM(r.SalesVolume) as decimal(14, 4)) / (SELECT SUM(r.SalesVolume) FROM RawData r)) * 100 
   as decimal(20,1)) as MarketSharesVolume
    FROM RawData r
    INNER JOIN Product p
    ON r.ProductId = p.ProductId
    WHERE p.Distributor in ('TF1','WARNER')
    GROUP BY p.Distributor;