arrays - How to use xpath in Postgres to align XML elements -

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this query:

with x (select '<promotions>     <promotion promotion-id="old-promotion">         <enabled-flag>true</enabled-flag>         <searchable-flag>false</searchable-flag>     </promotion>     <promotion promotion-id="new-promotion">         <enabled-flag>false</enabled-flag>         <searchable-flag>false</searchable-flag>         <exclusivity>no</exclusivity>         <price>100</price>         <price>200</price>         <price>300</price>     </promotion> </promotions>'::xml t ) select      xpath('/promotions/promotion/@promotion-id', t) promotion_id,     xpath('/promotions/promotion/enabled-flag/text()', t) enabled_flag,     xpath('/promotions/promotion/exclusivity/text()', t) exclusivity,     xpath('/promotions/promotion/price/text()', t) price x

for elements exclusivity , price not appear in first promotion, appear in second, yields result:

"{old-promotion,new-promotion}";"{true,false}";"{no}";"{100,200,300}"

i need figure out how can result set allow me line exclusivity , price data appropriate promotion_id's. this

"{old-promotion,new-promotion}";"{true,false}";"{,no}";"{,"100,200,300"}"

what have make happen?

consider this:

with x (select '<promotions>     <promotion promotion-id="old-promotion">         <enabled-flag>true</enabled-flag>         <searchable-flag>false</searchable-flag>     </promotion>     <promotion promotion-id="new-promotion">         <enabled-flag>false</enabled-flag>         <searchable-flag>false</searchable-flag>         <exclusivity>no</exclusivity>         <price>100</price>         <price>200</price>         <price>300</price>     </promotion> </promotions>'::xml t ) select xpath('//@promotion-id',       node) promotion_id       ,xpath('//enabled-flag/text()', node) enabled_flag       ,xpath('//exclusivity/text()',  node) exclusivity       ,xpath('//price/text()',        node) price (select unnest(xpath('/promotions/promotion', t)) node x) sub

the trick split document nodes first of unnest().
extract attributes each node. way null values automatically missing attributes.

returns:

  promotion_id   | enabled_flag | exclusivity |     price -----------------+--------------+-------------+---------------  {old-promotion} | {true}       | {}          | {}  {new-promotion} | {false}      | {no}        | {100,200,300}

related question:
xpath query hierarchical data, preserving ancestor–descendant relationship


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