SQL：如何統計一個字符串中每個元音的個數

Question

首先，我是一個SQL初學者。

我有一個名爲State在表如下圖所示

State 
Karnataka 
Uttar Pradesh 
Tamilnadu 
Telangana 
Kerela 
Andhra Pradesh 

我想知道有多少元音存在於每個狀態和結果應該是單獨爲每個元音在那裏我有數據列。

預期輸出：

State   Count of a Count of e Count of i Count of o Count of u 
Karnataka  4   0   0   0   0 
Uttar Pradesh 2   1   0   0   1 

Answer 1

請嘗試以下SQL：

SELECT 
State, 
LEN(state)-LEN(REPLACE(state,'a','')) 'Count of a', 
LEN(state)-LEN(REPLACE(state,'e','')) 'Count of e', 
LEN(state)-LEN(REPLACE(state,'i','')) 'Count of i', 
LEN(state)-LEN(REPLACE(state,'o','')) 'Count of o', 
LEN(state)-LEN(REPLACE(state,'u','')) 'Count of u' 
FROM TableName 

Answer 2

使用PIVOT：

CREATE TABLE #TEST ([STATE] NVARCHAR(MAX)) 

INSERT INTO #TEST VALUES ('Karnataka' ) 
INSERT INTO #TEST VALUES ('Uttar Pradesh') 
INSERT INTO #TEST VALUES ('Tamilnadu' ) 
INSERT INTO #TEST VALUES ('Telangana' ) 
INSERT INTO #TEST VALUES ('Kerela'  ) 
INSERT INTO #TEST VALUES ('Andhra Pradesh') 

SELECT * 
FROM 
(
SELECT [STATE], N, LEN([STATE]) - LEN(REPLACE([STATE], N,'')) AS VOWELCOUNT 
FROM #TEST 
CROSS JOIN (VALUES('A'),('E'),('I'),('O'),('U')) AS A(N) 
) PVT 
PIVOT (MAX(VOWELCOUNT) FOR N IN ([A],[E],[I],[O],[U])) AS D