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.

youdao

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.

youdao

比较两个字符串是否相等，区分大小写。

Compares two Strings, returning true if they are equal ignoring the case.

youdao