Android:So treten Sie der untergeordneten Tabelle mit der übergeordneten Tabelle Sqlite bei

Sie können den Hochschulnamen als Fremdschlüssel in der Studententabelle verwenden. Stellen Sie sicher, dass Ihre beiden Spaltentabellen unterschiedliche Spaltennamen haben. Stellen Sie einfach sicher, dass COLUMN_ID ="id" als COLUMN_ID ="s_id"

// Datenbanknamepublic static final String DATABASE_NAME ="details.db";

        // Table 1
        public static final String TABLE_NAME = "CollegeName";
        public static final String COLUMN_ID = "c_ID";
        public static final String COLUMN_TITLE = "college_NAME";
        private static final String COLUMN_IMAGE = "image_bitmap";
    
        // Table 2
        private static final String TABLE2_NAME = "studentsName";
        public static final String COLUMN1_ID = "s_ID";
        public static final String COLUMN2_TITLE = "students_NAME";


public void onCreate(SQLiteDatabase sqLiteDatabase) {

        String query =
                "CREATE TABLE IF NOT EXISTS " + TABLE_NAME + "("
                        + COLUMN_ID + " INTEGER PRIMARY KEY  ,"
                         + COLUMN_TITLE + " TEXT, "
                + COLUMN_IMAGE + " BLOB );";

        sqLiteDatabase.execSQL(query);

        String query1 =
                "CREATE TABLE IF NOT EXISTS " + TABLE2_NAME + "("
                        + COLUMN1_ID + " INTEGER PRIMARY KEY ,"
                        + COLUMN2_TITLE + "  TEXT ,"
                        + COLUMN_C_ID + " INTEGER, " + "FOREIGN KEY("+ 
                   COLUMN_C_ID +") " 
     + "REFERENCES " + TABLE_NAME +"("+COLUMN_ID +")"+ ");";


        sqLiteDatabase.execSQL(query1);

    }