sqlite> create table test ( id integer primary key autoincrement,word text not null unique on conflict ignore );
sqlite> insert into test values (1,'xxx');
sqlite> insert into test values (2,'id');
sqlite> select * from test;
1|xxx
2|id
sqlite> select * from test where word = "id";
sqlite> select * from test where word = 'id';
2|id

这是因为id是当前模式中列的名称,因为您可以在列名称周围使用双引号,sqlite认为您在谈论列,而不是给出字符串.即：

sqlite> insert into test values (3,3);
sqlite> select * from test where word = "id";
3|3
sqlite> select * from test where word = id;
3|3

如果你可以在列上使用双引号,那是因为空格在列名中是合法的：

sqlite> create table test2 ( "foo bar" integer );
sqlite> .schema test2
CREATE TABLE test2 ( "foo bar" integer );
sqlite> insert into test2 values (42);
sqlite> select * from test2;
42
sqlite> select * from test2 where "foo bar" = 42;
42