SQL 计数分组依据

【问题标题】：SQL COUNT GROUP BYSQL 计数分组依据
【发布时间】：2011-11-08 13:15:16
【问题描述】：

我有这张桌子：

码包重量
-------------------
11 2 20
12 1 45
11 1 15
12 4 15

我怎样才能得到结果：

码包重量
-------------------
11 3 35
12 5 60

提前谢谢你，史蒂夫

【问题讨论】：

【解决方案1】：

SELECT    Code,
          SUM(Packet) AS Packet,
          SUM([Weight]) AS [Weight]
FROM      [YourTable]
GROUP BY  CODE
ORDER BY  CODE

【讨论】：

【解决方案2】：

SELECT Code, SUM(Packet) [Packet], SUM(Weight) [Weight]
FROM MyTable
GROUP BY Code

【讨论】：

【解决方案3】：

SELECT Code, SUM(Packet) as Packet, SUM(Weight) as Weight
FROM Table
GROUP BY Code

【讨论】：

【解决方案4】：

select code, sum(packet), avg(weight) from mytable group by code

【讨论】：

【解决方案5】：

SELECT 
    SUM(Packet) AS PacketSum,
    SUM(Weight) AS WeightSum

FROM table
GROUP BY Code

【讨论】：