In the RDF model a statement is represented by three elements: two vertices connected by an edge reflecting the subject, predicate and object of a sentence—this is known as an RDF triple. Every vertex and edge
A pure relational database, as designed by Codd, is built on tuples grouped into relations, consistent with first-order predicate logic. Real-world relational databases have tables that contain fields, constraints, and triggers, and tables are related through foreign keys. SQL is used to declare...
Waveset stores the value of an inline attribute, however, directly in the object table for that type. Designating an attribute as inline allows Waveset to generate more efficient SQL. A column expression on the main object table is faster than a JOIN to (or an EXISTS predicate against) the...
Java 8 is a giant step forward for the Java language. Writing this book has forced me to learn a lot more about it. In Project Lambda, Java gets a new closure syntax, method-references, and default methods on interfaces. It manages to add many of the features of functional languages wit...
Previously, condition pushdown was limited to predicate terms referring to column values from the same table to which the condition was being pushed. In NDB 8.0, this restriction is removed such that column values from tables earlier in the query plan can also be referred to from pushed conditio...
predicate and object of a sentence—this is known as an RDF triple. Every vertex and edge is identified by a unique URI, or Unique Resource Identifier. The RDF model provides a way to publish data in a standard format with well-defined semantics, enabling information exchange. Government stati...
Description: RDF graph databases, also known as triple stores, are designed to store, retrieve, and query data in the form of triples, consisting of subject-predicate-object. These databases are often linked to the semantic web and linked data initiatives.Examples: Virtuoso, Jena, Stardog, ...
“from node” of an edge is called the subject. The “to node” is called the object. When you connect two nodes with an edge, you form a subject-predicate-object statement, known as a Triple. The edges can be navigated and queried in either direction. So, a Knowledge Graph is a ...
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00918. 00000 - "%s: column ambiguously specified - appears in %s and %s" Now, this one is pretty easy to figure out, when there is only ONE predicate clause, but what if you had…30 predicate clauses? Which column reference is tripping the problem???