SQL-合并两个具有不同日期值的表 [英] SQL - Combine two tables with different date value

问题描述

我正在研究在网站上显示股票信息的项目.我想问一下如何在SQL中合并两个表.

I'm working on project to display stock information in a website. And i want to ask how to combine two tables in SQL.

假设我们有Table1

Suppose we have Table1

stock_id     date     p_high   p_low
------------------------------------
3         2013-02-26     100      80
3         2013-02-25     100      80
3         2013-02-24     100      80
1         2013-02-24     100      80
3         2013-02-23     100      80
2         2013-02-23     100      80

我们有Table2

stock_id     date       open   high  low  close  volume
---------------------------------------------------------
3         2013-02-24     90    110    70    90     250
3         2013-02-23     90    110    70    90     250
2         2013-02-23     90    110    70    90     250
3         2013-02-22     90    110    70    90     250
3         2013-02-21     90    110    70    90     250
1         2013-02-21     90    110    70    90     250

我想合并日期并显示所有数据，

And i want to combine the date and display all the data like this,

更新:我想结合日期和stock_id

Update: I want to combine the date and the stock_id

stock_id     date       open   high  low  close  volume  p_high  p_low
------------------------------------------------------------------------
3         2013-02-26                                       100    80
3         2013-02-25                                       100    80
3         2013-02-24     90    110    70    90     250     100    80
3         2013-02-23     90    110    70    90     250     100    80
3         2013-02-22     90    110    70    90     250
3         2013-02-21     90    110    70    90     250

谢谢您的帮助.

推荐答案

查询: SQLFIDDLEExample

Query: 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

结果:

| 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) |

这篇关于SQL-合并两个具有不同日期值的表的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！