Occasionally, I used the HR administration device database (from bankruptcy 1, Querying Neo4j successfully with trend Matching) while it'd be extra applicable. to attempt out the code, you could arrange the database with the scripts, you could obtain from the Packt Publishing web site (http://www. packtpub. com/support). Operators The operators are grouped by means of class. such a lot of them go back a null worth if any operand has a null price. besides, there are a few exceptions. So, for every operator, the habit in case of a null price operand is certain. comparability operators comparability operators are binary operators that go back a Boolean or a null price as effects. they're normally utilized in the the place clause (see bankruptcy 2, clear out, mixture, and mix effects, for info) to clear out info in response to a , even if they are often utilized in the go back clause besides. In Cypher, comparability operators may be grouped in periods: ordering operators and equality operators. Operators and services Ordering operators Ordering operators are used to check values (usually estate values or literals). they're as follows: Operator < Description <= under or equivalent to > more than >= more than or equivalent to lower than let's examine an instance utilizing this sort of operators. this question seems for all books released in 2012 or later. If a PublishedBy courting does not have the yr estate set, will probably be discarded. The question is as follows: fit (a:Book)-[r:PublishedBy]-(b:Publisher) the place r. 12 months >= 2012 go back a,r,b be aware the subsequent results: • basically numbers and string values are supported. • evaluating any price to a null price will lead to a null worth. for instance, the entire following expressions will provide a null worth: °° 1 < NULL °° NULL < "String" °° NULL < NULL • evaluating nodes or relationships is an unlawful operation. it is going to lead to a syntax blunders. • evaluating numbers of alternative forms (a double price with an integer worth or an extended worth with an integer worth) is supported; in spite of the fact that, numbers can be switched over earlier than being in comparison. • evaluating arrays isn't really supported. • evaluating numbers to thread values will generate a runtime blunders. in the event you have no idea even if a estate is a host within the dataset and if a string comparability is adequate, you could lodge to the STR functionality (this is roofed later during this appendix). [ 124 ] Appendix Equality operators Equality operators are used to check the equality of 2 values. They go back a Boolean worth or a null price. they're as follows: • = returns real if the 2 values are equivalent • <> returns real if the 2 values are usually not equivalent the subsequent question returns the books that experience the desired identify: fit (a:Book) the place a. name = "Learning Cypher" go back a word the next: • evaluating any worth to a null price will lead to a null price. to check null values, use the NULL equality operators pointed out within the subsequent part. for instance, the entire following expressions will supply a null price because the consequence: °° 230.