Question

这是我使用正常的WHERE条件

完成的QUERY

<ScrollView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:padding="5dp">

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">

    <com.foodjoo.fjco.customViews.BYekanFontText
        android:id="@+id/market_category"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="right"
        android:padding="@dimen/normal_plus_value"
        android:text=" لبنیات > مارکت پیکی علی  "
        android:textAppearance="@style/Base.TextAppearance.AppCompat.Subhead"
        android:textColor="@color/light_black2" />

    <android.support.v7.widget.RecyclerView
        android:id="@+id/market_cat_recycler"
        android:layout_width="match_parent"
        android:layout_height="500dp" />

    <com.foodjoo.fjco.customViews.BYekanFontText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="right"
        android:padding="@dimen/normal_plus_value"
        android:text="ساعات کار"
        android:textAppearance="@style/Base.TextAppearance.AppCompat.Subhead"
        android:textColor="@color/light_black2" />

    <android.support.v7.widget.RecyclerView
        android:id="@+id/market_hours_recycler"
        android:layout_width="match_parent"
        android:layout_height="500dp" />

</LinearLayout>

这与JOIN完成相同的过程，但产生错误

SELECT  FIXTURE.Fixture_ID, FIXTURE.Game_Date, TEAM.Team_Name,
        OPPONENT.Opponent_Team_Name, FIXTURE.Results, FIXTURE.Score,
        FIXTURE.Location
    FROM  FIXTURE,TEAM,OPPONENT
    WHERE  FIXTURE.Location='Home'
      AND  FIXTURE.TM_ID = TEAM.Team_ID
      AND  FIXTURE.OPP_ID = OPPONENT.Opponent_ID
    GROUP BY  Game_Date
    ORDER BY  Game_Date DESC;

我在这里做错了什么？请提出正确的解决方案。

谢谢。

Answer 1

JOIN和WHERE的顺序不正确，JOIN必须在FROM之后和WHERE之前：

SELECT FIXTURE.Fixture_ID,
       FIXTURE.Game_Date,
       TEAM.Team_Name,
       OPPONENT.Opponent_Team_Name,
       FIXTURE.Results,
       FIXTURE.Score,
       FIXTURE.Location
FROM FIXTURE
     JOIN TEAM ON FIXTURE.TM_ID = TEAM.Team_ID
     JOIN OPPONENT ON FIXTURE.OPP_ID = OPPONENT.Opponent_ID
WHERE FIXTURE.Location='Home'
GROUP BY Game_Date
ORDER BY Game_Date DESC;

按日期降序选择所有家庭装置的查询

1 个答案: