獲取總行數

Question

目前，我有三列批次數據。 每批都有不同的日期戳設置的共同價值。 我正在嘗試計算每個公共值集的分組數。 下面的示例：表名 = Data1

 Position     Lot       Date                      
    1         ABCD       2021-10-01 15:00.000
    1         ABCD       2021-10-01 15:30.000
    1         ABCD       2021-10-01 15:45.000
    2         ABCDE      2021-10-01 19:00.000
    2         ABCDE      2021-10-01 19:56.000
    2         ABCDE      2021-10-01 20:00.000

Output expected would be:
 Position    Count    Lot
    1          3     ABCD
    2          3     ABCDE

Select DISTINCT COUNT(POSITION) AS COUNT, LOT
FROM DATA1
GROUP BY POSITION;

我得到 2 計數而不是 3。

Answer 1

DISTINCT適用於整個結果集，通常應用不正確。 根據 6 行樣本數據，我的第一個猜測是：

SELECT Position, Lot, [Count] = COUNT(*) 
  FROM dbo.Data1
  GROUP BY Position, Lot;

Answer 2

檢查這個。

SELECT Position, COUNT(Position) AS Count, Lot
FROM  DATA1
GROUP BY Position, Lot