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      Schema Checker

      @ judges whether the current node/edge belongs to a given schema, and is often combined with property filtering.

      • Expression: @<schema>
      • Operand: string constant

      When combined with property filtering, i.e., @<schema> && <property> == 123 is shortened as @<schema>.<property> == 123, the <property> cannot be _id or _uuid

      The @<schema> and @<schema>.<property> that appear in an Ultipa filter find the metadata of a specific schema and/or property, which is different than the @<schema> and @<schema>.<property> that appear in some other chain statements that find a specific schema and/or property in a graph model. Please read GraphSet | Schema | Property for more information.

      Node

      Example: find and return 10 Cards with their properties

      find().nodes({@card}) as n
      limit 10
      return n{*} 
      

      Analysis: we can also use another expression {@ == "card"}, see Conditional Operators ==.

      Edge

      Example: find and return 10 @transfer edges with their properties

      find().edges({@transfer}) as e
      limit 10
      return e{*} 
      

      Schema & Property

      Example: find Cards whose balance is over 500000, return 10 cards with all properties.

      find().nodes({@card.balance > 500000}) as n
      limit 10
      return n{*} 
      

      Analysis: this filter can be extended as {@card && balance > 500000}, see Conditional Operators &&.

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