將MySQL轉換爲SQL Server

我試圖運行以下查詢（針對Foodmart 2000），它在MySQL上運行良好。在SQL Server 2005上，我得到的只是一條「附近的語法錯誤」消息。將MySQL轉換爲SQL Server

SELECT * FROM ((SELECT COUNT(state_province) AS 'WA' 
       FROM customer c1 
       WHERE c1.state_province LIKE 'WA' 
       GROUP BY c1.state_province) as t1, 
       (SELECT COUNT(state_province) AS 'OR' 
       FROM customer c1 
       WHERE c1.state_province LIKE 'OR' 
       GROUP BY c1.state_province) as t2, 
       (SELECT COUNT(state_province) AS 'CA' 
       FROM customer c1 
       WHERE c1.state_province LIKE 'CA' 
       GROUP BY c1.state_province) as t3);

究竟是什麼導致了這個問題？

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2012-12-04 Tobias Timpe

我認爲你應該爲主表提供一個別名。 'SELECT * FROM（.....）tbl' – arunes

什麼是輸入以及該查詢的預期輸出是什麼？ – Alex

試試這個;使用SUM單SELECT代替COUNT

SELECT SUM(CASE WHEN state_province LIKE 'WA' THEN 1 ELSE 0 END) AS 'WA', 
     SUM(CASE WHEN state_province LIKE 'OR' THEN 1 ELSE 0 END) AS 'OR', 
     SUM(CASE WHEN state_province LIKE 'CA' THEN 1 ELSE 0 END) AS 'CA' 
FROM customer --c1 
--GROUP BY c1.state_province

編輯：工作演示，SQL Fiddle here

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2012-12-04 12:29:02 Kaf

你缺少一個別名：

SELECT * 
FROM 
(
    select * 
    from 
    (SELECT COUNT(state_province) AS 'WA' 
    FROM customer c1 
    WHERE c1.state_province LIKE 'WA' 
    GROUP BY c1.state_province) as t1, 
    (SELECT COUNT(state_province) AS 'OR' 
    FROM customer c1 
    WHERE c1.state_province LIKE 'OR' 
    GROUP BY c1.state_province) as t2, 
    (SELECT COUNT(state_province) AS 'CA' 
    FROM customer c1 
    WHERE c1.state_province LIKE 'CA' 
    GROUP BY c1.state_province) as t3 
) src; -- < add this alias

您必須對所有派生表和子查詢的別名。

您也可以通過以下使用版本@卡夫的仍然有count：

SELECT count(CASE WHEN state_province LIKE 'WA' THEN 1 ELSE null END) AS 'WA', 
     count(CASE WHEN state_province LIKE 'OR' THEN 1 ELSE null END) AS 'OR', 
     count(CASE WHEN state_province LIKE 'CA' THEN 1 ELSE null END) AS 'CA' 
FROM customer

看到SQL Fiddle with Demo

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2012-12-04 12:21:02 Taryn

我只是試着運行，我仍然得到相同的錯誤。 –

添加註釋並沒有幫助，請參閱[SQL小提琴]（http://www.sqlfiddle.com/#!6/cc7b9/14/1）。 –

@OlafDietsche你是對的，修好了 – Taryn

SELECT * FROM (Select (SELECT COUNT(state_province) AS 'WA' 
       FROM customer c1 
       WHERE c1.state_province LIKE 'WA' 
       GROUP BY c1.state_province) as t1, 
       (SELECT COUNT(state_province) AS 'OR' 
       FROM customer c1 
       WHERE c1.state_province LIKE 'OR' 
       GROUP BY c1.state_province) as t2, 
       (SELECT COUNT(state_province) AS 'CA' 
       FROM customer c1 
       WHERE c1.state_province LIKE 'CA' 
       GROUP BY c1.state_province) as t3) a ;

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2012-12-04 12:26:56 bummi

剛剛從子選擇離開了括號圍繞你並刪除group by，他們是不必要的

SELECT * FROM (SELECT COUNT(state_province) AS 'WA' 
       FROM customer c1 
       WHERE c1.state_province LIKE 'WA') as t1, 
       (SELECT COUNT(state_province) AS 'OR' 
       FROM customer c1 
       WHERE c1.state_province LIKE 'OR') as t2, 
       (SELECT COUNT(state_province) AS 'CA' 
       FROM customer c1 
       WHERE c1.state_province LIKE 'CA') as t3;

請參閱SQL Fiddle進行測試。

來源

2012-12-04 12:41:39

我寧願PIVOT我的數據

SELECT [WA] AS [WA], [OR] AS [OR], [CA] AS [CA] FROM 
(SELECT state_province FROM customer) C 
PIVOT 
(
    COUNT(C.state_province) FOR state_province IN ([WA],[OR],[CA]) 
) AS pivoted

Fiddle here

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2012-12-04 12:46:05 Alex

嗯，首先，感謝所有的建議。你們都是對的，我錯過了別名。另外，事實證明，我必須在聲明前添加「使用foodmart2000」。愚蠢的我:)

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2012-12-04 12:46:12

@bluefeet和@bummi是非常接近。問題是，你不能使用as關鍵字與表的別名在SQL Server：

SELECT * 
FROM 
(
    (SELECT COUNT(state_province) AS 'WA' 
    FROM customer c1 
    WHERE c1.state_province LIKE 'WA' 
    GROUP BY c1.state_province) t1, 
    (SELECT COUNT(state_province) AS 'OR' 
    FROM customer c1 
    WHERE c1.state_province LIKE 'OR' 
    GROUP BY c1.state_province) t2, 
    (SELECT COUNT(state_province) AS 'CA' 
    FROM customer c1 
    WHERE c1.state_province LIKE 'CA' 
    GROUP BY c1.state_province) t3 
) src;

你可能會得到來自@ KAF的例子更好的性能，但是。

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2012-12-04 12:46:31

將MySQL轉換爲SQL Server

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