MySQL查询-使用ORDER BY rand()强制区分大小写 [英] MySQL query - force case-sensitive with a ORDER BY rand( )

问题描述

是否可以对查询强制区分大小写?

Is it possible to force case-sensitive for a query?

我的声音听起来像这样:

Mine sounds like this:

"SELECT g_path FROM glyphs WHERE g_glyph = :g_glyph ORDER BY rand()"

如果g_glyph = r，结果可以是R或r，这不是我期望的. 我正在寻找区分大小写的退货.

if g_glyph = r, the result can be R or r and it's not what I expect. I'm looking for a case-sensitive return.

我在问题上进行了搜索，找到了以下解决方案:

I googled my issue and I found this solution:

/*Case-sensitive sort in descending order.
In this query, ProductName is sorted in 
case-sensitive descending order.
*/
SELECT ProductID, ProductName, UnitsInStock
FROM products
ORDER BY BINARY ProductName DESC;

但是以下行根本不起作用:

But the following line doesn't work at all:

"SELECT g_path FROM glyphs WHERE g_glyph = :g_glyph ORDER BY BINARY rand()"

有什么建议吗?

非常感谢您的帮助.

推荐答案

字符的顺序和相等性由

The order and equality of characters is defined by the collation. In most cases, a case-insensitive collation is used.

如果需要对特定的基准使用严格的，区分大小写的比较，请使用

If you need to use a strict, case-sensitive comparison for a specific datum, use the BINARY operator:

mysql> SELECT 'a' = 'A';
        -> 1
mysql> SELECT BINARY 'a' = 'A';
        -> 0
mysql> SELECT 'a' = 'a ';
        -> 1
mysql> SELECT BINARY 'a' = 'a ';
        -> 0

所以在您的情况下:

SELECT g_path FROM glyphs WHERE BINARY g_glyph = :g_glyph ORDER BY rand()

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