如何使用sql从同一级别的所有xml元素中选择属性

Question

My xml is:

<foo>
    <bar>
        <button text="a"/>
        <button text="b"/>
        <button text="c"/>
    </bar>
</foo>

With the following I'm able to get one of those text values, but I'm trying to get all 3 back (each on their own row). I realize [1] is why I'm getting one back... but I'm not sure how to get all of them back?

select 
    cast(f.xml as xml).value('(/foo/bar/button/@text)[1]', 'varchar(max)') as foo
from
    (select top 1 * from files) f

This returns

Foo
---
 a

Where I'm actually trying to get

Foo
---
 a
 b
 c

Answer 1

You need to use the nodes operator in your FROM , which you can do by using a CROSS APPLY :

DECLARE @XML xml = '
<foo>
    <bar>
        <button text="a"/>
        <button text="b"/>
        <button text="c"/>
    </bar>
</foo>';

SELECT fb.button.value('@text','char(1)')
FROM (VALUES(@XML))X(XMLString)
     CROSS APPLY X.XMLSTRING.nodes('foo/bar/button') fb(button);

Answer 2

I think this query does the trick:

declare @xml as xml = 
'<foo>
    <bar>
        <button text="a"/>
        <button text="b"/>
        <button text="c"/>
    </bar>
</foo>'

select T.C.value('@text','varchar(50)') as button
FROM @xml.nodes('/foo/bar/button') as T(C)