How can I get list of parent node in XML with SQL server?

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Hi All,
Assume I have table with xml datatype. Consider below value as data in xml.

XML

<Books>
  <Book ID="BK1">
    <Pages>
      <Page ID="Home" />
      <Page ID="Index" />
      <Page ID="Introduction" />
    </Pages>
  </Book>
  <Book ID="BK2">
    <Pages>
      <Page ID="Home" />
      <Page ID="Introduction" />
    </Pages>
  </Book>
  <Book ID="BK3">
    <Pages>
      <Page ID="Home" />
      <Page ID="Index" />
      <Page ID="Introduction" />
    </Pages>
  </Book>
  <Book ID="BK4">
    <Pages>
      <Page ID="Home" />
      <Page ID="Introduction" />
    </Pages>
  </Book>
</Books>

I want list of book ID for which Page ID=Index is missing? (For ex, in Book ID=BK2 and ID=BK4, Page ID=Index is missing?

Output:
BookId
BK2
BK4

What I have tried:

SQL

SELECT Data.Col.value('(@ID)[1]','Varchar(100)') AS Books
FROM @x.nodes('/Books/Book/Pages/Page') AS Data(Col)
WHERE @x.exist('(/Books/Book/Pages/Page[@ID = sql:variable("@BookId")])') = 1

Posted 21-May-19 0:37am

Dilip Mevada

Updated 21-May-19 2:58am

Nirav Prabtani

v4

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Richard Deeming · Accepted Answer · 2019-05-21T02:59:00

Solution 1

You don't need to specify the full path in the exist test; you just want to test against the current <Book> node, rather than the whole document:

SQL

SELECT data.col.value('@ID', 'varchar(100)')
FROM @x.nodes('/Books/Book') As data(col)
WHERE data.col.exist('Pages/Page[@ID="Index"]') = 0;

Posted 21-May-19 2:59am

Richard Deeming

Updated 21-May-19 3:00am

v2

Comments

Dilip Mevada 22-May-19 7:59am

Thanks for solution. Its works perfectly.

Can we fetch data directly from SQL Table instead of Nodes? For example. Books table.
I have additional where clause with SQL Table. Please suggest.

Richard Deeming 22-May-19 8:32am

If the XML is stored in a column in your table, then you need to use CROSS APPLY to extract the nodes:
Specifying the nodes() method against a column of xml type | nodes() Method (xml Data Type) - SQL Server | Microsoft Docs[^]

SELECT data.col.value('@ID', 'varchar(100)')
FROM YourTableWithAnXmlColumn As T
CROSS APPLY T.YourXmlColumn.nodes('/Books/Book') As data(col)
WHERE T.SomeColumn = @SomeValue
And data.col.exist('Pages/Page[@ID="Index"]') = 0;