Snowflake cloud data platform 从变体表横向展平雪花

我有一个名为

raw_json

的变量表，其中包含多个json文件，这些文件对于ID是唯一的，但在每个json中包含相似的数据点。它们位于jsontext列中。这是一个上下文的SS。我正在尝试将

raw_json

表的每一行展平到一个普通的表视图中。两个数组索引需要对齐以分配正确的值

下面是

raw_json

表中的两行，以及json的结构

{
 "ID": "PO-103",
 "content": {
   "EEList": [
     {
       "EEListID": "PO-103-1",
       "EEProductID": "XXX1976",

     },
     {
       "EEListID": "PO-103-2",
       "EEProductID": "XXX1977",
     },
     {
       "EEListID": "PO-103-3",
       "EEProductID": "XXX1978",
     }
   ],
   "EENotesList": [
     {
       "FirstName": "John",
       "LastName": "Smith",
       "pxObjClass": "XX-XXSales-Work-XX"
     },
     {
       "FirstName": "Bob",
       "LastName": "Joe",
       "pxObjClass": "XX-XXSales-Work-XX"
     },
     {
       "FirstName": "Mike",
       "LastName": "Smith",
       "pxObjClass": "XX-XXSales-Work-XX"
     }
   ],
 }
}

像这样的桌子里（我需要这个）

我已经能够将eNoteList数组展平到一个表中，并为该表分配正确的ID。到目前为止，我的代码是这样的：在不扇出表格的情况下添加EEList值是我出错的地方

select
    jsontext:ID::varchar as ID,
    en.value:FirstName::varchar as FirstName,
    en.value:LastName::varchar as LastName,
    en.value:pxObjClass::varchar as pxObjClass
   -- concat(ID, EEProductID, FirstName, LastName)

    from raw_json,
    lateral flatten (input => jsontext:content:EENotesList, outer => false) en;

它产生了这个表（我有这个）

---

因此，这个答案主要是将数据放入CTE的序言，但是“iff”两个数组的顺序是同步的，您可以使用展平的索引来访问其他类型的原始数组：

WITH raw_json AS (
select PARSE_json(column1) AS jsontext FROM VALUES 
 ('{
 "ID": "PO-103",
 "content": {
   "EEList": [
     {
       "EEListID": "PO-103-1",
       "EEProductID": "XXX1976",

     },
     {
       "EEListID": "PO-103-2",
       "EEProductID": "XXX1977",
     },
     {
       "EEListID": "PO-103-3",
       "EEProductID": "XXX1978",
     }
   ],
   "EENotesList": [
     {
       "FirstName": "John",
       "LastName": "Smith",
       "pxObjClass": "XX-XXSales-Work-XX"
     },
     {
       "FirstName": "Bob",
       "LastName": "Joe",
       "pxObjClass": "XX-XXSales-Work-XX"
     },
     {
       "FirstName": "Mike",
       "LastName": "Smith",
       "pxObjClass": "XX-XXSales-Work-XX"
     }
   ],
 }
}'), ('{
  "ID": "PO-104",
  "content": {
    "EEList": [
      {
        "EEListID": "PO-104-1",
        "EEProductID": "XXX1979",

      },
      {
        "EEListID": "PO-104-2",
        "EEProductID": "XXX1980",
      },
      {
        "EEListID": "PO-104-3",
        "EEProductID": "XXX1981",
      }
    ],
    "EENotesList": [
      {
        "FirstName": "Sarah",
        "LastName": "Butler",
        "pxObjClass": "XX-XXSales-Work-XX"
      },
      {
        "FirstName": "Jessica",
        "LastName": "Adams",
        "pxObjClass": "XX-XXSales-Work-XX"
      }
    ],
  }
}') 
)
select
    jsontext:ID::varchar as ID,
    en.value:FirstName::varchar as FirstName,
    en.value:LastName::varchar as LastName,
    en.value:pxObjClass::varchar as pxObjClass,
    jsontext:content.EEList[en.index].EEListID::text as EEListID,
    jsontext:content.EEList[en.index].EEProductID::text as EEProductID
    from raw_json,
    lateral flatten (input => jsontext:content:EENotesList, outer => false) en;

这导致：

ID  FIRSTNAME   LASTNAME    PXOBJCLASS  EELISTID    EEPRODUCTID
PO-103  John    Smith   XX-XXSales-Work-XX  PO-103-1    XXX1976
PO-103  Bob     Joe     XX-XXSales-Work-XX  PO-103-2    XXX1977
PO-103  Mike    Smith   XX-XXSales-Work-XX  PO-103-3    XXX1978
PO-104  Sarah   Butler  XX-XXSales-Work-XX  PO-104-1    XXX1979
PO-104  Jessica Adams   XX-XXSales-Work-XX  PO-104-2    XXX1980

---

这正是我要找的！您在哪里找到如何使用EEList[en.index]？在Snowflake文档中找不到任何索引。能否展开答案的第一部分？我从来没有使用过CTE，也没有使用过上下文。我只是假设它在很久以前可以工作，因为它是JSON对象上的Javascript访问样式。。我很确定还有一个像访问器一样的get_成员。我只是使用

或

：

来访问子元素。CTE（公共表表达式）是一个表达式，它使命名表类似于您可以在其他地方访问的内容，非常类似于带有别名的子选择，但如果您多次加入该子表达式，则不需要多次定义它。。我经常使用逻辑上独立的处理步骤，因为优化器可以并且确实会将所有步骤混合在一起，就像它是子选择一样。。。

+--------+-----------+----------+-------------------+
|   ID   | FirstName | LastName |    pxObjClass     |
+--------+-----------+----------+-------------------+
| PO-103 | John      | Smith    | X-XXSales-Work-XX |
| PO-103 | Bob       | Joe      | X-XXSales-Work-XX |
| PO-103 | Mike      | Smith    | X-XXSales-Work-XX |
| PO-104 | Sarah     | Butler   | X-XXSales-Work-XX |
| PO-104 | Jessica   | Adams    | X-XXSales-Work-XX |
| PO-104 | Terrence  | Williams | X-XXSales-Work-XX |
+--------+-----------+----------+-------------------+

WITH raw_json AS (
select PARSE_json(column1) AS jsontext FROM VALUES 
 ('{
 "ID": "PO-103",
 "content": {
   "EEList": [
     {
       "EEListID": "PO-103-1",
       "EEProductID": "XXX1976",

     },
     {
       "EEListID": "PO-103-2",
       "EEProductID": "XXX1977",
     },
     {
       "EEListID": "PO-103-3",
       "EEProductID": "XXX1978",
     }
   ],
   "EENotesList": [
     {
       "FirstName": "John",
       "LastName": "Smith",
       "pxObjClass": "XX-XXSales-Work-XX"
     },
     {
       "FirstName": "Bob",
       "LastName": "Joe",
       "pxObjClass": "XX-XXSales-Work-XX"
     },
     {
       "FirstName": "Mike",
       "LastName": "Smith",
       "pxObjClass": "XX-XXSales-Work-XX"
     }
   ],
 }
}'), ('{
  "ID": "PO-104",
  "content": {
    "EEList": [
      {
        "EEListID": "PO-104-1",
        "EEProductID": "XXX1979",

      },
      {
        "EEListID": "PO-104-2",
        "EEProductID": "XXX1980",
      },
      {
        "EEListID": "PO-104-3",
        "EEProductID": "XXX1981",
      }
    ],
    "EENotesList": [
      {
        "FirstName": "Sarah",
        "LastName": "Butler",
        "pxObjClass": "XX-XXSales-Work-XX"
      },
      {
        "FirstName": "Jessica",
        "LastName": "Adams",
        "pxObjClass": "XX-XXSales-Work-XX"
      }
    ],
  }
}') 
)
select
    jsontext:ID::varchar as ID,
    en.value:FirstName::varchar as FirstName,
    en.value:LastName::varchar as LastName,
    en.value:pxObjClass::varchar as pxObjClass,
    jsontext:content.EEList[en.index].EEListID::text as EEListID,
    jsontext:content.EEList[en.index].EEProductID::text as EEProductID
    from raw_json,
    lateral flatten (input => jsontext:content:EENotesList, outer => false) en;

ID  FIRSTNAME   LASTNAME    PXOBJCLASS  EELISTID    EEPRODUCTID
PO-103  John    Smith   XX-XXSales-Work-XX  PO-103-1    XXX1976
PO-103  Bob     Joe     XX-XXSales-Work-XX  PO-103-2    XXX1977
PO-103  Mike    Smith   XX-XXSales-Work-XX  PO-103-3    XXX1978
PO-104  Sarah   Butler  XX-XXSales-Work-XX  PO-104-1    XXX1979
PO-104  Jessica Adams   XX-XXSales-Work-XX  PO-104-2    XXX1980