Android SQLite: near "...": syntax error (code 1): , while compiling: SELECT ".." FROM ".."WHERE _id=?

I'm getting this error when running my code in Android Studio.

08-06 04:10:00.209  24514-24514/com.example.mk.anotherapp E/SQLiteLog﹕ (1) near "16": syntax error
08-06 04:10:00.269  24514-24514/com.example.mk.anotherapp E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.example.mk.anotherapp, PID: 24514
android.database.sqlite.SQLiteException: near "16": syntax error (code 1): , while compiling: SELECT 10 FROM 16 WHERE _id=?
        at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
        at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:889)
        at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:500)
        at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
        at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
        at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:37)
        at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:44)
        at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1314)
        at android.database.sqlite.SQLiteDatabase.queryWithFactory(SQLiteDatabase.java:1161)
        at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1032)
        at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1238)
        at com.example.mk.anotherapp.Irradfrag$1.onClick(Irradfrag.java:108)
        at android.view.View.performClick(View.java:4445)
        at android.view.View$PerformClick.run(View.java:18446)
        at android.os.Handler.handleCallback(Handler.java:733)
        at android.os.Handler.dispatchMessage(Handler.java:95)
        at android.os.Looper.loop(Looper.java:136)
        at android.app.ActivityThread.main(ActivityThread.java:5146)
        at java.lang.reflect.Method.invokeNative(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:515)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:732)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:566)
        at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:132)
        at dalvik.system.NativeStart.main(Native Method)

Here is the relevant code:

            //assign actual values
            Integer pitch = pitchsel;
            Integer orientation = orientaationsel * 5;
            Double shadefactor =   shadesel / 100.0;
            String postregion = "1";

            RegionDatabase mDb  = new RegionDatabase(getActivity());
            SQLiteDatabase db = mDb.getReadableDatabase();
            String[] columns = {"Region"};
            String Selection = "_id=?";
            String[] SelectionArgs ={""+postcodesel};

            Cursor cursor = db.query("Region_Key",columns,Selection,SelectionArgs,null,null,null,null);
            while (cursor.moveToNext()) {
                    postregion = cursor.getString(cursor.getColumnIndexOrThrow("Region"));
                    Toast.makeText(getActivity(),"Region:"+ postregion, Toast.LENGTH_SHORT).show();
                }


             String[] columnsx = {""+orientation};
             String[] SelectionArgsx ={""+pitch};
             String ratio ="1";
// This is the query that the error refers to
            cursor = db.query(postregion,columnsx,Selection,SelectionArgsx,null,null,null,null);
            while (cursor.moveToNext()) {
                ratio = cursor.getString(cursor.getColumnIndexOrThrow(""+orientation));
                Toast.makeText(getActivity(),"Ratio:"+ ratio, Toast.LENGTH_SHORT).show();
            }

What really has me stumped is that the first query works perfectly and the second doesn't. This is a syntax error and the syntax seems to be exactly the same. The queries are done in two different tables in the same database. I've double checked the column names and data values to make sure everything exists as typed.

The other times this error has been posted, it is usually a case of wrong quotes in a rawquery, but that's not what I'm doing.