Sql tive是一个相关子查询： SELECT created_at, ( SELECT AVG(value) FROM test_result t1 WHERE t1.test = t.t

tive是一个相关子查询：

SELECT 
    created_at, 
    (
        SELECT AVG(value) 
        FROM test_result t1 
        WHERE t1.test = t.test and t1.created_at <= t.created_at
        ORDER BY t1.created_at DESC LIMIT 4
    ) running_avg_value
FROM test_result t

---

post您的错误adb logcat会让您感到非常痛苦，因为事情滚动得如此之快是完全没有用的，但无论如何，我现在会把它放在原始问题中，比如，

db.rawQuery（“选择测试，MAX（创建时）OVER（按测试顺序划分，按创建时的描述）FROM test_result；”，arrayOf（））.close（）

您正在运行哪个版本的SQLite？@GMB我的SQLite版本是3.18.2非常感谢您的回答。您知道如何在android上升级sqlite吗？我没有找到太多关于这方面的信息，我甚至不知道这是否可能。这就是为什么我感到困惑的原因，我的桌面版应用程序运行了查询，而安卓版没有。@ArnaudParan:不幸的是，我对安卓一无所知……不管怎样，我是根据你的建议进行查询的，现在我的应用程序运行得很好，你让我开心

db.rawQuery("SELECT MAX(created_at) FROM test_result;", arrayOf()).close()

09-03 07:58:28.627 10723 10723 E AndroidRuntime: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.memorizer/com.example.memorizer.TestActivity}: android.database.sqlite.SQLiteException: near "(": syntax error (code 1): , while compiling: SELECT MAX(created_at) OVER (PARTITION BY test ORDER BY created_at) FROM test_result;
09-03 07:58:28.627 10723 10723 E AndroidRuntime: #################################################################
09-03 07:58:28.627 10723 10723 E AndroidRuntime: Error Code : 1 (SQLITE_ERROR)
09-03 07:58:28.627 10723 10723 E AndroidRuntime: Caused By : SQL(query) error or missing database.
09-03 07:58:28.627 10723 10723 E AndroidRuntime:    (near "(": syntax error (code 1): , while compiling: SELECT MAX(created_at) OVER (PARTITION BY test ORDER BY created_at) FROM test_result;)
09-03 07:58:28.627 10723 10723 E AndroidRuntime: #################################################################
09-03 07:58:28.627 10723 10723 E AndroidRuntime:    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2957)
09-03 07:58:28.627 10723 10723 E AndroidRuntime:    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3032)
09-03 07:58:28.627 10723 10723 E AndroidRuntime:    at android.app.ActivityThread.-wrap11(Unknown Source:0)
09-03 07:58:28.627 10723 10723 E AndroidRuntime:    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1696)
09-03 07:58:28.627 10723 10723 E AndroidRuntime:    at android.os.Handler.dispatchMessage(Handler.java:105)
09-03 07:58:28.627 10723 10723 E AndroidRuntime:    at android.os.Looper.loop(Looper.java:164)
09-03 07:58:28.627 10723 10723 E AndroidRuntime:    at android.app.ActivityThread.main(ActivityThread.java:6944)
09-03 07:58:28.627 10723 10723 E AndroidRuntime:    at java.lang.reflect.Method.invoke(Native Method)
09-03 07:58:28.627 10723 10723 E AndroidRuntime:    at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
09-03 07:58:28.627 10723 10723 E AndroidRuntime:    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)
09-03 07:58:28.627 10723 10723 E AndroidRuntime: Caused by: android.database.sqlite.SQLiteException: near "(": syntax error (code 1): , while compiling: SELECT MAX(created_at) OVER (PARTITION BY test ORDER BY created_at) FROM test_result;
09-03 07:58:28.627 10723 10723 E AndroidRuntime: #################################################################
09-03 07:58:28.627 10723 10723 E AndroidRuntime: Error Code : 1 (SQLITE_ERROR)
09-03 07:58:28.627 10723 10723 E AndroidRuntime: Caused By : SQL(query) error or missing database.
09-03 07:58:28.627 10723 10723 E AndroidRuntime:    (near "(": syntax error (code 1): , while compiling: SELECT MAX(created_at) OVER (PARTITION BY test ORDER BY created_at) FROM test_result;)
09-03 07:58:28.627 10723 10723 E AndroidRuntime: #################################################################
09-03 07:58:28.627 10723 10723 E AndroidRuntime:    at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
09-03 07:58:28.627 10723 10723 E AndroidRuntime:    at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:1096)
09-03 07:58:28.627 10723 10723 E AndroidRuntime:    at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:661)
09-03 07:58:28.627 10723 10723 E AndroidRuntime:    at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
09-03 07:58:28.627 10723 10723 E AndroidRuntime:    at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:59)
09-03 07:58:28.627 10723 10723 E AndroidRuntime:    at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:37)
09-03 07:58:28.627 10723 10723 E AndroidRuntime:    at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:44)
09-03 07:58:28.627 10723 10723 E AndroidRuntime:    at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1746)
09-03 07:58:28.627 10723 10723 E AndroidRuntime:    at android.database.sqlite.SQLiteDatabase.rawQuery(SQLiteDatabase.java:1685)
09-03 07:58:28.627 10723 10723 E AndroidRuntime:    at com.example.memorizer.TestActivity.getData(TestActivity.kt:202)
09-03 07:58:28.627 10723 10723 E AndroidRuntime:    at com.example.memorizer.TestActivity.onCreate(TestActivity.kt:184)
09-03 07:58:28.627 10723 10723 E AndroidRuntime:    at android.app.Activity.performCreate(Activity.java:7183)
09-03 07:58:28.627 10723 10723 E AndroidRuntime:    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1220)
09-03 07:58:28.627 10723 10723 E AndroidRuntime:    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2910)
09-03 07:58:28.627 10723 10723 E AndroidRuntime:    ... 9 more

SELECT 
    created_at, 
    (
        SELECT AVG(value) 
        FROM test_result t1 
        WHERE t1.test = t.test and t1.created_at <= t.created_at
        ORDER BY t1.created_at DESC LIMIT 4
    ) running_avg_value
FROM test_result t

AVG(value) OVER(PARTITION BY test ROWS BETWEEN 3 PRECEDING AND CURRENT ROW)