使用Oracle SQL

Question

總結子節點在XML我有以下格式

<Receive 
    xmlns:xsd="http://www.w3.org/2001/XMLSchema" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> 
    <Date>20171106</Date> 
    <ReceiptDetails> 
     <ReceiptDetail> 
      <Quantity>3</Quantity> 
     </ReceiptDetail> 
     <ReceiptDetail> 
      <Quantity>2</Quantity> 
     </ReceiptDetail> 
     <ReceiptDetail> 
      <Quantity>1</Quantity> 
     </ReceiptDetail> 
     <ReceiptDetail> 
      <Quantity>4</Quantity> 
     </ReceiptDetail> 
    </ReceiptDetails> 
</Receive> 

XML現在我想查詢的Oracle SQL查詢返回我的節點數量的總和。

我寫了一個連接值的查詢。

SELECT 
XMLTYPE(t.REQ_MSG).EXTRACT('//Receive/ReceiptDetails/ReceiptDetail/Quantity/text()').getStringVal() 
FROM 
    TABLE_NAME t; 

這給了我3214這是連接值，但我想要10這是總和。

Answer 1

考慮使用XMLTABLE將XML節點解析到列中，然後在外部查詢中進行聚合。

SELECT SUM(e.Quantity) AS SumQuantity 

FROM XMLTABLE('/Receive/ReceiptDetails/ReceiptDetail' 
     PASSING XMLTYPE('<Receive xmlns:xsd="http://www.w3.org/2001/XMLSchema" 
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> 
          <Date>20171106</Date> 
          <ReceiptDetails> 
           <ReceiptDetail> 
            <Quantity>3</Quantity> 
           </ReceiptDetail> 
           <ReceiptDetail> 
            <Quantity>2</Quantity> 
           </ReceiptDetail> 
           <ReceiptDetail> 
            <Quantity>1</Quantity> 
           </ReceiptDetail> 
           <ReceiptDetail> 
            <Quantity>4</Quantity> 
           </ReceiptDetail> 
          </ReceiptDetails> 
         </Receive>') 
     COLUMNS 
     Quantity NUMBER PATH 'Quantity') as e 

以及XML列在一個表中

SELECT SUM(e.Quantity) AS SumQuantity 

FROM MY_TABLE, 
     XMLTABLE('/Receive/ReceiptDetails/ReceiptDetail' 
     PASSING XMLTYPE(MY_TABLE.MY_XML_COLUMN) 

     COLUMNS 
     Quantity NUMBER PATH 'Quantity') as e 

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