如何用指定的單詞對數據進行計數？

Question

我是SQL的新面孔。 假設我有一組數據：

================== 
|| iphone6  || 
|| iphone7  || 
|| iphone7s  || 
|| Android 7.1 || 
|| Android 6.3 || 
================== 

而且我想要得到的結果是這樣的：

||Model  ||Amount || 
========================== 
||iphone  ||  3|| 
||Android ||  2|| 
========================== 

我的代碼是這樣的：

SELECT 
CASE 
    WHEN model LIKE '%Android%' THEN 'Android' 
    WHEN model LIKE '%iPhone%' THEN 'IPhone' 
END, 
, COUNT(*) AS Amount FROM #table GROUP BY model; 

但我的輸出是：

||Model  || Amount|| 
========================== 
||IPhone ||   1|| 
||IPhone ||   1|| 
||IPhone ||   1|| 
||Android ||   1|| 
||Android ||   1|| 
========================== 

how ca我解決了它？

Answer 1

你只需要通過你所創建的列彙總：

SELECT (CASE WHEN model LIKE '%Android%' THEN 'Android' 
      WHEN model LIKE '%iPhone%' THEN 'IPhone' 
     END), 
     COUNT(*) AS Amount 
FROM #table 
GROUP BY (CASE WHEN model LIKE '%Android%' THEN 'Android' 
       WHEN model LIKE '%iPhone%' THEN 'IPhone' 
      END);