要想创建对于所有字符串比较不区分大小写的数据库，需要使用排序规则U CA500R1，见清单4。
To create a database that is case-insensitive for all string comparisons, it is necessary to use the collation UCA500R1 as shown in Listing 4.
换句话说，在不区分大小写的数据库中，字符串比较的开销可能会略微增加。
In other words, string comparisons may be slightly more expensive in a case-insensitive database.
标头的键应为字符串，在不区分大小写的基础上进行比较。
Keys to the headers are required to be strings, and comparisons are done on a case-insensitive basis.
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