sql server - Filter duplicate nodes before inserting into XML field -


i using xml field store suggestions books in format:

<books>   <book id="1" score="2" />   <book id="2" score="3" /> </books>

at point need add suggestions xml. done these statements:

declare @books xml; select @books = suggestions.query('//books/book')  user userid = @userid  update user set suggestions.modify('insert sql:variable("@books") first (//books)[1]') userid = @userid

how can make sure i'm not inserting nodes exist (based on id attribute only).

one way achieve creating new xml variable new values.

data:

create table #user(userid int, suggestions xml, name varchar(100));  insert #user(userid, suggestions, name) values (1,         '<books>           <book id="1" score="2" />           <book id="2" score="3" />         </books>'         ,'john');  declare @books xml =n'<book id="1" score="2" />                       <book id="2" score="3" />                       <book id="3" score="4" />                       <book id="4" score="4" />';

query:

declare @userid int = 1;        ,@only_new_books xml;  ;with books (    select id    = s.c.value('@id', 'int'),           score = s.c.value('@score', 'int')    @books.nodes('/book') s(c) ), suggestions (    select userid,        id    = s.c.value('@id', 'int'),       score = s.c.value('@score', 'int')   #user   cross apply suggestions.nodes('//books/book') s(c)   userid = @userid ) select @only_new_books = (select b.id '@id',                                  b.score '@score'                           books b                           left join suggestions s                             on b.id = s.id                           s.id null                           xml path('book'),type                           );  update #user set suggestions.modify('insert sql:variable("@only_new_books")                          first (//books)[1]') userid = @userid;  select * #user;

livedemo

output:

╔════════╦══════════════════════════════════════╦══════╗ ║ userid ║             suggestions              ║ name ║ ╠════════╬══════════════════════════════════════╬══════╣ ║      1 ║ <books>                              ║ john ║     ║        ║    <book id="3" score="4" />         ║      ║ ║        ║    <book id="4" score="4" />         ║      ║ ║        ║    <book id="1" score="2" />         ║      ║ ║        ║    <book id="2" score="3" />         ║      ║ ║        ║ </books>                             ║      ║ ╚════════╩══════════════════════════════════════╩══════╝

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