Question

我已经为此工作了大约两天，似乎无法弄清楚，所以我希望获得帮助。

我有两个表：

mysql> select id, date, volume, symbol_id  from control_quotedaily limit 5;
+-------+---- -------+----------+-----------+
| id    | date       | volume   | symbol_id |
+-------+------------+----------+-----------+
| 13263 | 2017-11-02 |  7800191 | AXISBANK  |
| 13264 | 2017-11-02 |  9303981 | SBIN      |
| 13265 | 2017-11-02 |  8013536 | HDFCBANK  |
| 13266 | 2017-11-03 |  9642624 | AXISBANK  |
| 13267 | 2017-11-04 | 19642327 | AXISBANK  |
+-------+------------+----------+-----------+
5 rows in set (0.00 sec)
14 rows in set (0.01 sec)

mysql> select * from control_oidaily
+-----------+------------+-------------+--------------+
| symbol_id | date       | expiry_date | val_in_lakhs |
+-----------+------------+-------------+--------------+
| AXISBANK  | 2017-11-02 | 2017-11-30  |     166881.8 |
| AXISBANK  | 2017-11-02 | 2017-12-28  |      2676.84 |
| AXISBANK  | 2017-11-02 | 2018-01-25  |        97.13 |
| HDFCBANK  | 2017-11-02 | 2017-11-30  |     76351.11 |
| HDFCBANK  | 2017-11-02 | 2017-12-28  |      1509.48 |
| HDFCBANK  | 2017-11-02 | 2018-01-25  |            0 |
| SBIN      | 2017-11-02 | 2017-11-30  |      88654.3 |
| SBIN      | 2017-11-02 | 2017-12-28  |      1060.51 |
| SBIN      | 2017-11-02 | 2018-01-25  |            0 |
| AXISBANK  | 2017-11-03 | 2017-11-30  |     87640.06 |
+-----------+------------+-------------+--------------+

因此，对于control_quotedaily表中的每个报价，这就是我想要的：

control_oidaily表中该报价的最接近到期日期
我想要那个有效日期的val_in_lakhs。

例如：对于日期2017-11-02，最接近的到期日期是2017-11-30，我希望返回val_in_lakhs（76351.11）。

这是我正在尝试的：

select o.date, o.expiry_date as expiry_date, o.symbol_id, q.date, q.symbol_id, o.val_in_lakhs, q.tottrdval, q.volume, q.symbol_id
FROM control_oidaily o
JOIN ( select o.date, MIN(expiry_date) as expiry_date, symbol_id
    FROM control_oidaily o
    GROUP by o.date,o.symbol_id                 
    ORDER BY o.date asc) as ed
ON ed.date = o.date 
    AND ed.symbol_id = o.symbol_id
    AND ed.expiry_date = o.expiry_date
JOIN control_quotedaily q
ON q.date = ed.date
    AND q.symbol_id = ed.symbol_id

这是我期望的输出：

+-------+------------+----------+-----------+--------------+--------------+
| id    | date       | volume   | symbol_id | expiry_date  | val_in_lakhs |
+-------+------------+----------+-----------+--------------+--------------+
| 13263 | 2017-11-02 |  7800191 | AXISBANK  | 2017-11-30   |     166881.8 |
| 13264 | 2017-11-02 |  9303981 | SBIN      | 2017-11-30   |      88654.3 |
| 13265 | 2017-11-02 |  8013536 | HDFCBANK  | 2017-11-30   |     76351.11 |
| 13266 | 2017-11-03 |  9642624 | AXISBANK  | 2017-11-30   |     87640.06 |
+-------+------------+----------+-----------+--------------+--------------+

Answer 1

在Derived Table中，从{{1}获取closest_expiry_date和expiry_date的{{1}}（最小值symbol_id） }表。
将其与date和control_oidaily上的control_quotedaily表结合起来，以获取symbol_id表中每一行的最近值。
现在，再次使用相同的派生表与date表联接，在control_quotedaily，control_oidaily（具有最接近的到期日期）和date上进行匹配，以得到{ {1}}。

您可能需要以下查询：

expiry_date

连接两个表不能按预期工作

1 个答案: