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  • sql Test

    IF NOT OBJECT_ID('[t_Brand]') IS NULL    
    DROP TABLE [t_Brand]
    GO
    CREATE 
    TABLE [t_Brand]
    (
    [ID] int identity(1,1) primary key not null,
    [brandName] Nvarchar(20) null
    )
    go
    IF NOT OBJECT_ID('[t_Product]') IS NULL    
    DROP TABLE [t_Product]
    GO
    CREATE TABLE [t_Product]
    (
    [ID] int identity(1,1) primary key not null,
    [ProductName] Nvarchar(20) null
    )
    go
    INSERT [t_Brand]
    SELECT '喜来登珠宝 ' 
    union all SELECT '香菲草  ' 
    union all SELECT '夏普' 
    union all SELECT '仙蒂罗娜' 
    union all SELECT '小鸡卡迪' 
    union all SELECT '小龙哈彼' 
    go
    insert into [t_Product]
    SELECT '喜来登珠宝 ' 
    union all SELECT '香菲草  ' 
    union all SELECT '夏普' 
    union all SELECT '仙蒂罗娜' 
    union all SELECT '小鸡卡迪' 
    union all SELECT '小龙哈彼'
    union all SELECT '香菲草  '
    union all SELECT '夏普' 
    union all SELECT '仙蒂罗娜' 
    union all SELECT '小鸡卡迪'
    union all SELECT '小龙哈彼'
    union all SELECT '小龙哈彼' 
    union all SELECT '香菲草  ' 
    union all SELECT '仙蒂罗娜' 
    union all SELECT '小鸡卡迪' 
    union all SELECT '小龙哈彼' 
    union all SELECT '香菲草  ' 
    union all SELECT '夏普' 
    union all SELECT '夏普' 
    go
    select a.brandName as 品牌数,
    (
    select count(1)  from t_product  t where t. productname=a.brandname) 产品数 
    from T_brand aorder by 产品数 desc
    go
    /*品牌数    产品数
      香菲草      4
      夏普        4
      小龙哈彼    4
      仙蒂罗娜    3
      小鸡卡迪    3
      喜来登珠宝  1
    */
    
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  • 原文地址:https://www.cnblogs.com/Leo_wl/p/1807063.html
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