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CASE documentation

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Reviewers: teon.banek, buda

Reviewed By: buda

Subscribers: pullbot

Differential Revision: https://phabricator.memgraph.io/D699
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Mislav Bradac 2017-08-24 10:49:20 +02:00
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docs/user_technical/open-cypher.md
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@ -481,7 +481,22 @@ documentation.
#### CASE
TODO
Conditional expressions can be expressed in openCypher language by simple and
generic form of CASE expression. A simple form is used to compare an expression
against multiple predicates. For the first matched predicate result of the
expression provided after the THEN keyword is returned. If no expression is
matched value following ELSE is returned is provided, or null if ELSE is not
used:
MATCH (n)
RETURN CASE n.currency WHEN "DOLLAR" THEN "$" WHEN "EURO" THEN "€" ELSE "UNKNOWN" END
In generic form, you don't provided expression whose value is compared to
predicates, but you list multiple predicates and the first one that evaluates
to true is matched:
MATCH (n)
RETURN CASE WHEN n.height < 30 THEN "short" WHEN n.height > 300 THEN "tall" END
### Differences