Mysql SQL使用同一个表组合3个查询

我有3个查询，共享同一个表，查询1如下：

SELECT MAX(TranDate) AS MaxDate
FROM tblTransaction
WHERE AccNo = 12345

SELECT MAX(TransactionID) AS MaxTran
FROM tblTransaction
WHERE AccNo = 12345
    AND TranDate = 'pass max tran date here'

SELECT Commission
FROM tblTransaction
WHERE AccNo = 12345
    AND TransactionID = 'pass max tranID here'

在得到账户12345的最大交易日期后，我想使用最大日期在查询2中找到最大交易ID，如下所示：

SELECT MAX(TranDate) AS MaxDate
FROM tblTransaction
WHERE AccNo = 12345

SELECT MAX(TransactionID) AS MaxTran
FROM tblTransaction
WHERE AccNo = 12345
    AND TranDate = 'pass max tran date here'

SELECT Commission
FROM tblTransaction
WHERE AccNo = 12345
    AND TransactionID = 'pass max tranID here'

之后，我想将查询2中的最大事务ID传递给查询3，如下所示：

SELECT MAX(TranDate) AS MaxDate
FROM tblTransaction
WHERE AccNo = 12345

SELECT MAX(TransactionID) AS MaxTran
FROM tblTransaction
WHERE AccNo = 12345
    AND TranDate = 'pass max tran date here'

SELECT Commission
FROM tblTransaction
WHERE AccNo = 12345
    AND TransactionID = 'pass max tranID here'

如何组合这3个查询？谢谢使用此查询：

SELECT Commission
FROM tblTransaction
WHERE AccNo = 12345
    AND TransactionID = (
        SELECT MAX(TransactionID) AS MaxTran
        FROM tblTransaction
        WHERE AccNo = 12345
            AND TranDate = (
                SELECT MAX(TranDate) AS MaxDate
                FROM tblTransaction
                WHERE AccNo = 12345
            )
    )

SELECT Commission
FROM tblTransaction
WHERE AccNo = 12345
    AND TransactionID = (
        SELECT MAX(TransactionID) AS MaxTran
        FROM tblTransaction
        WHERE AccNo = 12345
            AND TranDate = (
                SELECT MAX(TranDate) AS MaxDate
                FROM tblTransaction
                WHERE AccNo = 12345
            )
      );

使用此查询：

SELECT Commission
FROM tblTransaction
WHERE AccNo = 12345
    AND TransactionID = (
        SELECT MAX(TransactionID) AS MaxTran
        FROM tblTransaction
        WHERE AccNo = 12345
            AND TranDate = (
                SELECT MAX(TranDate) AS MaxDate
                FROM tblTransaction
                WHERE AccNo = 12345
            )
      );

简单地说：

SELECT Commission
FROM tblTransaction
WHERE AccNo = 12345
    AND TransactionID = (
        SELECT MAX(TransactionID) AS MaxTran
        FROM tblTransaction
        WHERE AccNo = 12345
            AND TranDate = (
                SELECT MAX(TranDate) AS MaxDate
                FROM tblTransaction
                WHERE AccNo = 12345
            )
    )

简单地说：

SELECT Commission
FROM tblTransaction
WHERE AccNo = 12345
    AND TransactionID = (
        SELECT MAX(TransactionID) AS MaxTran
        FROM tblTransaction
        WHERE AccNo = 12345
            AND TranDate = (
                SELECT MAX(TranDate) AS MaxDate
                FROM tblTransaction
                WHERE AccNo = 12345
            )
    )

请给我一张桌子

检查以下查询：

SELECT commission
FROM tbltransaction
WHERE accno = 12345
    AND TransactionID = (
        SELECT MAX(tbl1.TransactionID) AS MaxTran
        FROM tbltransaction AS tbl1
        WHERE tbl1.accno = 12345
            AND tbl1.trandate = (
                SELECT MAX(tbl2.trandate) AS MaxDate
                FROM tbltransaction AS tbl2
                WHERE tbl2.accno = 12345
            )
    )

请给我一张桌子

检查以下查询：

SELECT commission
FROM tbltransaction
WHERE accno = 12345
    AND TransactionID = (
        SELECT MAX(tbl1.TransactionID) AS MaxTran
        FROM tbltransaction AS tbl1
        WHERE tbl1.accno = 12345
            AND tbl1.trandate = (
                SELECT MAX(tbl2.trandate) AS MaxDate
                FROM tbltransaction AS tbl2
                WHERE tbl2.accno = 12345
            )
    )

---

就我个人而言，我倾向于使用内部查询问题的语法

（此解决方案是针对sql server的，我甚至不知道mysql是否支持此功能）

---

显然，这比上面的解决方案更详细，但是您可以将这种查询（不包括WHERE）放在函数中，并根据需要更改条件。例如，您可以使用这样一个函数来生成一个列表，其中列出了最近一次交易佣金>100的所有用户。

就个人而言，我倾向于使用内部查询问题的语法

（此解决方案是针对sql server的，我甚至不知道mysql是否支持此功能）

---

显然，这比上面的解决方案更详细，但是您可以将这种查询（不包括WHERE）放在函数中，并根据需要更改条件。例如，您可以使用这样一个函数来生成最后一笔交易佣金>100的所有用户的列表。

以下是解决您问题的另一种方法

SELECT 
    t1.COMISSION,
    t2.MaxTran,
    t3.MaxDate
FROM tblTransaction t1
    INNER JOIN (SELECT MAX(TransactionID) as MaxTran FROM tblTransaction) t2
          ON t1.TransactionID = t2.MaxTran
    INNER JOIN (SELECT MAX(TranDate) as MaxDate FROM tblTransaction) t3
          ON t1.TranDate = t3.MaxDate
WHERE 
    1 = 1
    AND t1.ACCNO = 12345

---

这里有一个不同的方法来回答你的问题

SELECT 
    t1.COMISSION,
    t2.MaxTran,
    t3.MaxDate
FROM tblTransaction t1
    INNER JOIN (SELECT MAX(TransactionID) as MaxTran FROM tblTransaction) t2
          ON t1.TransactionID = t2.MaxTran
    INNER JOIN (SELECT MAX(TranDate) as MaxDate FROM tblTransaction) t3
          ON t1.TranDate = t3.MaxDate
WHERE 
    1 = 1
    AND t1.ACCNO = 12345

---

假设

tblTransaction

将

TransactionID

作为主键，您可以使用更简单的forMySQL：

SELECT Commission
FROM tblTransaction
WHERE AccNo = 12345
ORDER BY TranDate DESC,
         TransactionID DESC 
LIMIT 1 ;

SELECT TOP (1) Commission
FROM tblTransaction
WHERE AccNo = 12345
ORDER BY TranDate DESC,
         TransactionID DESC ;

对于SQL Server：

SELECT Commission
FROM tblTransaction
WHERE AccNo = 12345
ORDER BY TranDate DESC,
         TransactionID DESC 
LIMIT 1 ;

SELECT TOP (1) Commission
FROM tblTransaction
WHERE AccNo = 12345
ORDER BY TranDate DESC,
         TransactionID DESC ;

---

假设

tblTransaction

将

TransactionID

作为主键，您可以使用更简单的forMySQL：

SELECT Commission
FROM tblTransaction
WHERE AccNo = 12345
ORDER BY TranDate DESC,
         TransactionID DESC 
LIMIT 1 ;

SELECT TOP (1) Commission
FROM tblTransaction
WHERE AccNo = 12345
ORDER BY TranDate DESC,
         TransactionID DESC ;

对于SQL Server：

SELECT Commission
FROM tblTransaction
WHERE AccNo = 12345
ORDER BY TranDate DESC,
         TransactionID DESC 
LIMIT 1 ;

SELECT TOP (1) Commission
FROM tblTransaction
WHERE AccNo = 12345
ORDER BY TranDate DESC,
         TransactionID DESC ;

---

那么，您使用的是哪种数据库管理系统？mysql还是sql server？那么，您使用的是哪种DBMS？mysql或sql server？此查询中不需要表别名此查询中不需要表别名