Php 合并两列以创建帐户流查询

我有两个表，一个用于客户信用（付款），它看起来像这样：

id     client     date              amount
1       ana       2012-01-01        5000  
2       ana       2012 02-01        10000
3       ana       2012-03-01        5000

id    client      date             amount 
1       ana       2012-01-15        5000
2       ana       2012 02-15        8000
3       ana       2012-03-15        9000

date           payment     withdrawal 
2012-01-01     5000           ----
2012-01-15     -----          5000
2012-02-01     10000          ----  
2012-02-15     -----          8000
2012-03-01      5000          ----
2012-03-15     -----          9000

等等

另一张借记（取款）表如下所示：

id     client     date              amount
1       ana       2012-01-01        5000  
2       ana       2012 02-01        10000
3       ana       2012-03-01        5000

id    client      date             amount 
1       ana       2012-01-15        5000
2       ana       2012 02-15        8000
3       ana       2012-03-15        9000

date           payment     withdrawal 
2012-01-01     5000           ----
2012-01-15     -----          5000
2012-02-01     10000          ----  
2012-02-15     -----          8000
2012-03-01      5000          ----
2012-03-15     -----          9000

等等

我想生成一个查询，按日期对每个客户的所有交易进行排序，将两个日期列合并为一个，然后按日期排序，它应该如下所示：

id     client     date              amount
1       ana       2012-01-01        5000  
2       ana       2012 02-01        10000
3       ana       2012-03-01        5000

id    client      date             amount 
1       ana       2012-01-15        5000
2       ana       2012 02-15        8000
3       ana       2012-03-15        9000

date           payment     withdrawal 
2012-01-01     5000           ----
2012-01-15     -----          5000
2012-02-01     10000          ----  
2012-02-15     -----          8000
2012-03-01      5000          ----
2012-03-15     -----          9000

这是我尝试过的，但我知道这是错误的，它提供了重复的记录：

SELECT payments.amount, payments.date withdrawals.amount, withdrawals.date
FROM payments,withdrawals 
WHERE payments.client = withdrawals.client
ORDER BY date

我尝试了左连接，但结果相同：

 SELECT payments.amount, payments.date, withdrawals.amount, withdrawals.date
 FROM payments 
 LEFT JOIN withdrawals 
 ON payments.client= withdrawals.client
 ORDER BY date

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请帮助并感谢您

您需要的是一个完整的外部连接：

SELECT payments.amount, payments.date, withdrawals.amount, withdrawals.date
FROM payments FULL OUTER JOIN withdrawals
  ON payments.client= withdrawals.client
Order by date

或者使用联合（MySQL需要）：

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您需要执行两个简单的SELECT查询，每个表分别执行一个查询，然后使用UNION关键字组合结果，如下所示：

SELECT date, amount AS payment, NULL AS withdrawal FROM payments WHERE client = 'ana'
UNION ALL
SELECT date, NULL AS payment, amount AS withdrawal FROM withdrawals WHERE client = 'ana'
ORDER BY date

---

您不想执行任何类型的联接，因为每一行的数据只从一个表中提取，而不是从另一个表中提取。

是否将客户端用作外键？如果安娜拼错了她的名字，后来改成了安娜贝利怎么办？对于这种关系，尽量使用不可更改的类型，如ID。这取决于您使用的数据库类型，对于mysql，您应该使用UNION，因为它不执行完整的外部连接。我通过PHP这样做：$query=mysql_query（“SELECT…”）；while（$person=mysql_fetch_array（$query））{echo$person['client']；echo$person['date']；echo$person['amount']；echo“
”；}