找到mysql中给定日期范围的间隙，有多个连接

Question

我有四张桌子：

CREATE TABLE `A` (
  `AID` bigint(20) NOT NULL AUTO_INCREMENT,
  `Name` varchar(150) DEFAULT NULL,
  PRIMARY KEY (`AID`)
);

CREATE TABLE `B` (
  `BID` bigint(20) NOT NULL AUTO_INCREMENT,
  `DtStart` datetime DEFAULT NULL,
  `DtStop` datetime DEFAULT NULL,
  `AID` bigint(20) DEFAULT NULL,
  `CID` bigint(20) DEFAULT NULL,
  PRIMARY KEY (`BID`)
);

CREATE TABLE `C` (
  `CID` bigint(20) NOT NULL AUTO_INCREMENT,
  `FLAGS` smallint(6) DEFAULT NULL,
  PRIMARY KEY (`CID`)
);

CREATE TABLE `D` (
  `DID` bigint(20) NOT NULL AUTO_INCREMENT,
  `CID` bigint(20) DEFAULT NULL,
  `Name` varchar(150) DEFAULT NULL,
  PRIMARY KEY (`DID`)
);

我正在提供这样的数据，

INSERT INTO A (Name) VALUES ("First");
INSERT INTO C (FLAGS) VALUES (1);
INSERT INTO B (DtStart, DtStop, AID, CID) VALUES ("2016-09-07", "2017-09-07", 1, 1);
INSERT INTO D (CID, Name) VALUES (1, "Alan");
INSERT INTO C (FLAGS) VALUES (2);
INSERT INTO B (DtStart, DtStop, AID, CID) VALUES ("2016-09-15", "2017-09-23", 1, 2);
INSERT INTO D (CID, Name) VALUES (2, "John");

当我点击查询时：

SELECT 
    A.Name as Object, B.DtStart, B.DtStop, C.FLAGS, D.Name as User
FROM A
    LEFT JOIN B ON B.AID=A.AID
    LEFT JOIN C ON C.CID=B.CID
    LEFT JOIN D ON D.CID=C.CID
WHERE "2017-09-01" <= B.DtStop AND "2017-10-01" > B.DtStart;

我得到了结果：

+--------+---------------------+---------------------+-------+------+
| Object | DtStart             | DtStop              | FLAGS | User |
+--------+---------------------+---------------------+-------+------+
| First  | 2016-09-07 00:00:00 | 2017-09-07 00:00:00 |     1 | Alan |
| First  | 2016-09-15 00:00:00 | 2017-09-23 00:00:00 |     2 | John |
+--------+---------------------+---------------------+-------+------+
2 rows in set (0.00 sec)

我怎样才能找到包含给定日期范围间隙的所有行？

在我的示例中，我正在寻找报告（ 2017年9月1日到 2017年9月30日），所以我想要这样的结果：

+--------+---------------------+---------------------+-------+------+
| Object | DtStart             | DtStop              | FLAGS | User |
+--------+---------------------+---------------------+-------+------+
| First  | 2016-09-07 00:00:00 | 2017-09-07 00:00:00 |     1 | Alan |
| First  | 2017-09-08 00:00:00 | 2017-09-14 00:00:00 |  NULL | NULL |
| First  | 2016-09-15 00:00:00 | 2017-09-23 00:00:00 |     2 | John |
| First  | 2016-09-24 00:00:00 | 2017-09-30 00:00:00 |  NULL | NULL |
+--------+---------------------+---------------------+-------+------+
4 rows in set (0.00 sec)

这只是我原始表的模型，我在查询中有10个表的多个连接