Question

我正在尝试运行此查询：

SELECT 
      USER_KEY, CHAR_KEY, CONVERT(VARCHAR,substring(char_data, 9, 16)) as CHAR_NAME
FROM  CHAR_DATA0
WHERE CONVERT(VARCHAR,substring(char_data, 9, 16)) LIKE '%BrightSide08'

这对我没有任何回报。（我不明白为什么）

但是将查询更改为

SELECT 
      USER_KEY, CHAR_KEY, CONVERT(VARCHAR,substring(char_data, 9, 16)) as CHAR_NAME
FROM  CHAR_DATA0
WHERE CONVERT(VARCHAR,substring(char_data, 9, 16)) LIKE '%BrightSide08%'

请注意，唯一的变化是...LIKE '%BrightSide08%'

此查询现在返回包含数据的1行：
21045 300434 BrightSide08

的示例：

(I only need the wild card to be at the beginning because)

I want the following:  
    0BrightSide08
    1BrightSide08

But not:  
    0BrightSide082  
    1BrightSide083

这是char_data

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

Answer 1

实际上，我在评论中说得太早了。为你正在追踪的子字符串部分定义一个显式长度可以防止varchar无长度的波动性干扰你的查询：

DECLARE @x TABLE(y VARBINARY(MAX));

INSERT @x VALUES(
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
);

SELECT CONVERT(VARCHAR, SUBSTRING(y, 9, 16)) FROM @x
  WHERE CONVERT(VARCHAR, SUBSTRING(y, 9, 16)) LIKE '%BrightSide08';

-- 0 rows

SELECT CONVERT(VARCHAR, SUBSTRING(y, 9, 16)) FROM @x
  WHERE CONVERT(VARCHAR(12), SUBSTRING(y, 9, 16)) LIKE '%BrightSide08';

-- 1 row

现在，您是否应该使用12或其他内容取决于所有可能的值可能是什么以及它们可能嵌入varbinary值中此特定位置的位置。如果你能提供一些更具体的例子，我们可以进一步提供帮助，但与此同时，在宣布varchar时要特别注意而不是过于愚蠢。

Answer 2

最可能的原因是08之后有一些看不见的角色。可能出现的一种方法是将字段定义为char;然后用空格填充。

查看是否存在任何此类值的一种方法是追加字符以分隔值：

select '|'+char_data+'|'
. . .

您的查询中还有其他问题。您使用的varchar没有长度。坏，坏，坏。事实上，似乎根本不需要convert。你可以这样做：

substring(char_data, 9, 16) LIKE '%BrightSide08'

但这相当于：

left(char_data, 25) LIKE '%BrightSide08'

或者，因为您要在字段末尾查找值：

right(char_data, 12) = 'BrightSide08'

MS SQL，其中类似条款不返回数据

2 个答案: