Truy vấn: SQLFIDDLEExample
SELECT a.stock_id,
a.date,
a.open,
a.high,
a.low,
a.close,
a.volume,
a.p_high,
a.p_low
FROM (
SELECT t1.stock_id,
t1.date,
t2.open,
t2.high,
t2.low,
t2.close,
t2.volume,
t1.p_high,
t1.p_low
FROM table1 t1
LEFT JOIN table2 t2 ON t1.date = t2.date
UNION
SELECT t2.stock_id,
t2.date,
t2.open,
t2.high,
t2.low,
t2.close,
t2.volume,
t1.p_high,
t1.p_low
FROM table1 t1
RIGHT JOIN table2 t2 ON t1.date = t2.date ) a
WHERE a.stock_id = 3
Kết quả:
| STOCK_ID | DATE | OPEN | HIGH | LOW | CLOSE | VOLUME | P_HIGH | P_LOW |
-------------------------------------------------------------------------------------------------------------
| 3 | February, 26 2013 00:00:00+0000 | (null) | (null) | (null) | (null) | (null) | 100 | 80 |
| 3 | February, 25 2013 00:00:00+0000 | (null) | (null) | (null) | (null) | (null) | 100 | 80 |
| 3 | February, 24 2013 00:00:00+0000 | 90 | 110 | 70 | 90 | 250 | 100 | 80 |
| 3 | February, 23 2013 00:00:00+0000 | 90 | 110 | 70 | 90 | 250 | 100 | 80 |
| 3 | February, 22 2013 00:00:00+0000 | 90 | 110 | 70 | 90 | 250 | (null) | (null) |
| 3 | February, 21 2013 00:00:00+0000 | 90 | 110 | 70 | 90 | 250 | (null) | (null) |
