Question

我正在使用Teradata中的SQL来研究客户及他们的购物习惯。

说我有以下信息：

Table wklytrans
CustNm  GroceryStore  # WklyTrxns  Sum WklyTrxns  CustType
Jack    Publix        2            $70            Publix
Ruby    Kroger        1            $15            Both
Moe     Kroger        4            $120           Kroger
Ruby    Publix        1            $20            Both

我想创建一个新表，按如下方式对它们进行分类：

CustNm  CustType  # PubTrxns  Sum PubTrxns  # KroTrxns  Sum KroTrxns
Jack    Publix    2           $70           NULL        NULL
Ruby    Both      1           $20           1           $15
Moe     Kroger    NULL        NULL          4           $120

我目前正在尝试运行的代码如下：

CREATE MULTISET VOLATILE TABLE custclass AS(
SEL
CustNm,
CustType,
CASE WHEN CustType IN 'Both' AND GroceryStore IN 'Publix' THEN # WklyTrxns
WHEN CustType IN 'Publix' THEN # WklyTrxns
END AS # PubTrxns,
CASE WHEN CustType IN 'Both' AND GroceryStore IN 'Publix' THEN Sum WklyTrxns
WHEN CustType IN 'Publix' THEN Sum WklyTrxns
END AS Sum PubTrxns,
CASE WHEN CustType IN 'Both' AND GroceryStore IN 'Kroger' THEN # WklyTrxns
WHEN CustType IN 'Kroger' THEN # WklyTrxns
END AS # KroTrxns,
CASE WHEN CustType IN 'Both' AND GroceryStore IN 'Kroger' THEN Sum WklyTrxns
WHEN CustType IN 'Kroger' THEN Sum WklyTrxns
END AS Sum KroTrxns
FROM wklytrans
)
WITH DATA                                      
PRIMARY INDEX (CustNm)                          
ON COMMIT PRESERVE ROWS;

这是目前输出的内容：

CustNm  CustType  # PubTrxns  Sum PubTrxns  # KroTrxns  Sum KroTrxns
Jack    Publix    2           $70           NULL        NULL
Ruby    Both      1           $20           NULL        NULL
Ruby    Both      NULL        NULL          1           $15
Moe     Kroger    NULL        NULL          4           $120

如何让我的代码将Ruby的事务组合到同一行，以便它看起来像我想要的输出？

感谢任何帮助！

Answer 1

您可能需要使用MAX / GROUP BY组合多行，如下所示：

CREATE MULTISET VOLATILE TABLE custclass AS(
SEL

    CustNm,
    CustType,
    MAX(CASE WHEN CustType IN 'Both' AND GroceryStore IN 'Publix' THEN # WklyTrxns
        WHEN CustType IN 'Publix' THEN # WklyTrxns
        END) AS # PubTrxns,
    MAX(CASE WHEN CustType IN 'Both' AND GroceryStore IN 'Publix' THEN Sum WklyTrxns
        WHEN CustType IN 'Publix' THEN Sum WklyTrxns
        END) AS Sum PubTrxns,
    MAX(CASE WHEN CustType IN 'Both' AND GroceryStore IN 'Kroger' THEN # WklyTrxns
        WHEN CustType IN 'Kroger' THEN # WklyTrxns
        END) AS # KroTrxns,
    MAX(CASE WHEN CustType IN 'Both' AND GroceryStore IN 'Kroger' THEN Sum WklyTrxns
        WHEN CustType IN 'Kroger' THEN Sum WklyTrxns
        END) AS Sum KroTrxns
    FROM wklytrans
    GROUP BY 1,2
    )
WITH DATA                                      
PRIMARY INDEX (CustNm)                          
ON COMMIT PRESERVE ROWS;

使用案例何时在Teradata中对客户进行分类

1 个答案: