Question

我有一张这样的表：

    | ID | X1 | X2 | X3 | .. | Xn |
    +----+----+----+----+----+----+
    | 1  | x  | '' | x  | '' | '' |
    +----+----+----+----+----+----+
    | 2  | '' | '' | x  | '' | '' |
    +----+----+----+----+----+----+
    | 3  | x  | x  | x  | '' | x  |
    +----+----+----+----+----+----+
'' = Empty string, not null

现在我想知道有多少＆＃39; x＆＃39;在第2行或第3行或n行。有没有一种简单的方法来实现这一目标？

使用MS SQL Server 2008

Answer 1

SELECT ID,
       (SELECT COUNT(*)
        FROM   (VALUES (X1),
                       (X2),
                       (X3),
                       /* ... */
                       (Xn)) T(X)
        WHERE  X = 'X') AS Num
FROM   YourTable

Answer 2

不要以这种方式存储数据。而是将其存储在XCoord，YCoord，Value的表中。然后你可以做类似的事情：

SELECT     XCoord, COUNT(Value) AS XTotal
FROM         TicTacTable
WHERE     (Value = 'x')
GROUP BY XCoord

如何计算单行中的值？

2 个答案: