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* Functions starting with A * Functions starting with 'C' * More 'C' functions * Fix tests * Fix missing snippet * DATE_* functions * Apply suggestions from code review Co-authored-by: Bogdan Pintea <pintea@mailbox.org> --------- Co-authored-by: Bogdan Pintea <pintea@mailbox.org>
70 lines
1.7 KiB
Text
70 lines
1.7 KiB
Text
[discrete]
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[[esql-case]]
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=== `CASE`
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*Syntax*
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[source,esql]
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----
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CASE(condition1, value1[, ..., conditionN, valueN][, default_value])
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----
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*Parameters*
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`conditionX`::
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A condition.
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`valueX`::
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The value that's returned when the corresponding condition is the first to
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evaluate to `true`.
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`default_value`::
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The default value that's is returned when no condition matches.
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*Description*
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Accepts pairs of conditions and values. The function returns the value that
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belongs to the first condition that evaluates to `true`.
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If the number of arguments is odd, the last argument is the default value which
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is returned when no condition matches. If the number of arguments is even, and
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no condition matches, the function returns `null`.
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*Example*
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Determine whether employees are monolingual, bilingual, or polyglot:
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[source,esql]
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[source.merge.styled,esql]
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----
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include::{esql-specs}/docs.csv-spec[tag=case]
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----
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[%header.monospaced.styled,format=dsv,separator=|]
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|===
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include::{esql-specs}/docs.csv-spec[tag=case-result]
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|===
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Calculate the total connection success rate based on log messages:
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[source,esql]
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[source.merge.styled,esql]
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----
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include::{esql-specs}/conditional.csv-spec[tag=docsCaseSuccessRate]
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----
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[%header.monospaced.styled,format=dsv,separator=|]
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include::{esql-specs}/conditional.csv-spec[tag=docsCaseSuccessRate-result]
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|===
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Calculate an hourly error rate as a percentage of the total number of log
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messages:
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[source,esql]
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[source.merge.styled,esql]
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----
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include::{esql-specs}/conditional.csv-spec[tag=docsCaseHourlyErrorRate]
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----
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[%header.monospaced.styled,format=dsv,separator=|]
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|===
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include::{esql-specs}/conditional.csv-spec[tag=docsCaseHourlyErrorRate-result]
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|===
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