sql - 如何更改 sqlite3 数据库的排序规则以不区分大小写？

Question

我查询了提供排序数据的 sqlite3 数据库。数据根据varchar列“名称”进行排序。现在当我做查询

select * from tableNames Order by Name;

它提供这样的数据。

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意味着它正在考虑区分大小写的东西。我想要的方式如下

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那么我应该在 sqlite3 数据库中进行哪些更改以获得必要的结果？

相关字符串比较时如何将Sqlite3设置为不区分大小写？

Answer 1

要对其进行排序，不区分大小写，您可以使用ORDER BY Name COLLATE NOCASE

Answer 2

The SQLite Datatypes documentation discusses user-defined collation sequences. Specifically you use COLLATE NOCASE to achieve your goal.

They give an example:

CREATE TABLE t1(
    a,                 -- default collation type BINARY
    b COLLATE BINARY,  -- default collation type BINARY
    c COLLATE REVERSE, -- default collation type REVERSE
    d COLLATE NOCASE   -- default collation type NOCASE
);

and note that:

-- Grouping is performed using the NOCASE collation sequence (i.e. values -- 'abc' and 'ABC' are placed in the same group). SELECT count(*) GROUP BY d FROM t1;

Answer 3

select * from tableNames Order by lower(Name);

Michael van der Westhuizen explains in his comment below why this is not a good way. I am leaving this answer up so as to preserve his comment and to serve as a warning to others who might have the same 'bright' idea I had ;-)

Answer 4

在您的 SQLite 数据库中使用此语句：

PRAGMA case_sensitive_like = false