Doradus Query Language (Spider)

[Table of Contents](https://github.com/dell-oss/Doradus/wiki/Spider Databases: Table-of-Contents) | Previous | [Next](https://github.com/dell-oss/Doradus/wiki/Query Perspective (Spider))
Doradus Spider Databases: Doradus Query Language

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The Doradus query language (DQL) is used in object and aggregate queries. DQL is analogous to full text languages used by search engines such as Lucene and from which DQL borrows concepts such as terms, phrases, and ranges. To these, DQL adds link paths, quantifiers, and a transitive function to support graph-based searches.

This section describes DQL, including extensions supported by Doradus Spider.

• Query Perspective
• Clauses
• Clause Negation: NOT
• [Clause Connectors: AND, OR, and Parentheses](https://github.com/dell-oss/Doradus/wiki/Clause Connectors AND, OR, and Parentheses (Spider))
• Literals
• Null Values
• IS NULL Clause
• Text Contains Clauses
• Range Clauses
• Equality Clauses
• IN Clause
• Timestamp Clauses
• Link Clauses
• Quantifier Functions
• Transitive Function
• Count (<link path>)