Question

我在SQLite中有LIMIT 1的问题，我的查询没有LIMIT 1工作正常，但有时删除每个重复的元素。我想删除1行。

这有效：

myDataBase.execSQL("DELETE FROM praca
 WHERE pomieszczenie_id="+pomieszczenieid+" 

AND (praca.usluga_id IN (SELECT usluga_id FROM usluga
     WHERE usluga_nazwa='"+childvalue+"'))
AND (sciana_id IN(SELECT sciana_id from sciana 
    WHERE sciana_nazwa='"+rodzic_nazwa+"'))");

返回“LIMIT”语法错误

myDataBase.execSQL("DELETE FROM praca
 WHERE pomieszczenie_id="+pomieszczenieid+" 

AND (praca.usluga_id IN (SELECT usluga_id FROM usluga
     WHERE usluga_nazwa='"+childvalue+"'))
AND (sciana_id IN(SELECT sciana_id from sciana 
    WHERE sciana_nazwa='"+rodzic_nazwa+"')) LIMIT 1");

我该如何解决？

Answer 1

您可能需要启用SQLITE ENABLE UPDATE DELETE LIMIT或类似THIS的解决方法：

 delete from tablename where rowid in (
    select rowid from tablename condition LIMIT 1)

以上查询只是一个示例，请将其替换为您的查询和条件。

Answer 2

我认为你应该启用 SQLITE_ENABLE_UPDATE_DELETE_LIMIT http://www.sqlite.org/compile.html#enable_update_delete_limit

您必须使用NDK编译SQLite，并添加参数以启用SQLITE_ENABLE_UPDATE_DELETE_LIMIT

Answer 3

请尝试这样：

DELETE FROM praca where pomieszczenie_id in
(
select pomieszczenie_id from praca
 WHERE pomieszczenie_id="+pomieszczenieid+" 

AND (praca.usluga_id IN (SELECT usluga_id FROM usluga
     WHERE usluga_nazwa='"+childvalue+"'))
AND (sciana_id IN(SELECT sciana_id from sciana 
    WHERE sciana_nazwa='"+rodzic_nazwa+"')) LIMIT 1
)

从LIMIT 1错误删除

3 个答案: