我的SQL代码出了什么问题?
我尝试在此answer
之后删除重复的行但我一直收到以下错误:
near"(":语法错误:SELECT rn = ROW_NUMBER()OVER(
这是SQL代码:
SELECT
rn = ROW_NUMBER() OVER (PARTITION BY s.stop_id, s.stop_name
ORDER BY s.stop_id, s.stop_name)
FROM stops s
我在某处读到它与SQL版本或sqlite3的用法有关吗?
这里有一些问题的其他信息:
我有开始表:
table_beginning =
[some_text0 , some_text1 , some_text2 , some_text3 ]
[ bla_1 , monday , red , bla_something ]
[ bla_77 , tuesday , green , bla_other ]
[ bla_99 , monday , blue , bla_anything ]
[ bla_00 , wednesday , red , bla_maybe ]
[ bla_55 , monday , violet , bla_more ]
[ bal_66 , monday , red , bla_kind ]
[ bal_22 , monday , red , bla_stuff ]
我想最终找到一个没有关于col_2和col_3的问题的表(不关心col_1和col_4是什么!!)
如:
table_final1 =
[some_text0 , some_text1 , some_text2 , some_text3 ]
[ bla_1 , monday , red , bla_something ]
[ bla_77 , tuesday , green , bla_other ]
[ bla_99 , monday , blue , bla_anything ]
[ bla_00 , wednesday , red , bla_maybe ]
[ bla_55 , monday , violet , bla_more ]
( - >被踢出的哪些行并不重要。因此,接受的决赛桌也可能如下所示:
table_final2 =
[some_text0 , some_text1 , some_text2 , some_text3 ]
[ bla_77 , tuesday , green , bla_other ]
[ bla_99 , monday , blue , bla_anything ]
[ bla_00 , wednesday , red , bla_maybe ]
[ bla_55 , monday , violet , bla_more ]
[ bal_66 , monday , red , bla_kind ]
或
table_final3 =
[some_text0 , some_text1 , some_text2 , some_text3 ]
[ bla_77 , tuesday , green , bla_other ]
[ bla_99 , monday , blue , bla_anything ]
[ bla_00 , wednesday , red , bla_maybe ]
[ bla_55 , monday , violet , bla_more ]
[ bal_22 , monday , red , bla_stuff ]
重要的是col_2和col_3从来没有相同的两个条目!
正如您所见,some_text1 = monday AND some_text2 = red
现在只存在一次!!
(从仅仅查看col_2和col_3的观点来消除重复)
截至col_1和col_4中的内容 - 我并不关心那里的内容!我只关心col_2和col_3里面的内容(那里没有任何疑问!)
一个解决方案:
我找到了一种方法(但也许有一种更优雅的方式?)
CREATE TABLE table_intermediate AS
SELECT DISTINCT col_2, col_3
FROM table_beginning;
- >这会创建一个中间表
- >使用DISTINCT
关键字可以消除疑点
- > (缺点,我完全松开col_1和col_4信息)
也许有一个解决方案,我可以保存col_1和col_4的信息??? (再一次,我不关心col_1或col_4中的哪一个!)
答案 0 :(得分:2)
在SQLite中,您通常可以使用rowid
:
select s.*
from stops s
where s.rowid = (select min(s2.rowid)
from stops s2
where s2.stop_id = s.stop_id and s2.stop_name = s.stop_name
);
我不确定这是否是你真正需要的。但这似乎是你想要用row_number()
做的。如果没有达到这个位置,那么就用样本数据和期望的结果提出另一个问题。