FQL cheat sheet

The page provides a quick reference to all of the Fauna Query Language functions, group by their major functionality:

Array

`All`	Tests whether all of the provided values are true.
`Any`	Tests whether any of the provided values are true.
`Append`	Adds items to end of array.
`Count`	Counts the items in an array or set.
`Difference`	Returns an array of items in one array that are missing from additional arrays.
`Distinct`	Returns an array of the distinct items within multiple arrays.
`Drop`	Removes items from start of array.
`Filter`	Fetches specific items from array.
`Foreach`	Iterates over array items.
`Intersection`	Returns an array of the items that exist in all arrays.
`IsEmpty`	Tests whether an array or set is empty.
`IsNonEmpty`	Tests whether an array or set contains items.
`Map`	Applies a function to all array items.
`Max`	Returns the largest value in a list of numbers.
`Mean`	Returns the average value of the items in an array or set.
`Min`	Returns the smallest value in a list of numbers.
`Prepend`	Adds items to start of array.
`Reduce`	Reduce an array or set to a result via a lambda function.
`Sum`	Sums the items in an array or set.
`Take`	Fetches items from start of array.
`ToObject`	Converts an array to an object.
`Union`	Returns an array that combines the items in multiple arrays.

Authentication

`CreateKey`	Create a key.
`HasIdentity`	Checks whether the current client has credentials.
`Identify`	Verifies an identity’s credentials.
`Identity`	Fetches the identity’s auth token.
`KeyFromSecret`	Retrieves a key based on its secret.
`Keys`	Retrieves the keys associated with the specified database.
`Login`	Creates an auth token for an identity.
`Logout`	Logs out of the current (or all) sessions.

Basic

`At`	Retrieves documents at or before a timestamp.
`Call`	Executes a user-defined function.
`Do`	Executes expressions in order.
`If`	Evaluates an expression.
`Lambda`	Executes an anonymous function.
`Let`	Defines a variable’s value.
`Var`	Uses a variable’s value.

Conversion

`ToArray`	Converts an object to an array.
`ToDate`	Converts a value to a date.
`ToDouble`	Converts a value to a double-precision, floating-point number.
`ToInteger`	Converts a value to a decimal integer number.
`ToMicros`	Converts a value to the number of microseconds since Unix epoch.
`ToMillis`	Converts a value to the number of milliseconds since Unix epoch.
`ToNumber`	Converts a value to a number.
`ToObject`	Converts an array to an object.
`ToSeconds`	Converts a value to the number of seconds since Unix epoch.
`ToString`	Converts a value to a string.
`ToTime`	Converts a value to a timestamp.

Logical

`And`	Returns true if all values are true.
`Contains`	Returns true when an object path points to an object’s value.
`Equals`	Returns true of all values are equivalent.
`Exists`	Returns true if a document has an event at a specific time.
`GT`	Returns true if each value is greater than all following values.
`GTE`	Returns true if each value is greater than, or equal to, all following values.
`LT`	Returns true if each value is less than all following values.
`LTE`	Returns true if each value is less than, or equal to, all following values.
`Not`	Returns the opposite of a boolean expression.
`Or`	Returns true if any value is true.

Math

`Abs`	Returns the absolute value of a number.
`Acos`	Returns the arc cosine of a number.
`Add`	Returns the sum of one or more numbers.
`Asin`	Returns the arc sine of a number.
`Atan`	Returns the arc tangent of a number.
`BitAnd`	Returns the bitwise AND of one or more numbers.
`BitNot`	Returns the bitwise AND of one or more numbers.
`BitOr`	Returns the bitwise OR of one or more numbers.
`BitXor`	Returns the bitwise exclusive-OR of one or more numbers.
`Ceil`	Returns an integer that is greater than, or equal to, a number.
`Cos`	Returns the cosine of a number.
`Cosh`	Returns the hyperbolic cosine of a number.
`Count`	Counts the items in an array or set.
`Degrees`	Converts a number from radians to degrees.
`Divide`	Returns the quotient of two or more numbers.
`Exp`	Returns e raised to the power of a number.
`Floor`	Returns an integer that is less than, or equal to, a number.
`Hypot`	Returns the length of a hypotenuse of a right triangle, given the lengths of the other two sides.
`Ln`	Returns the natural logarithm (base e) of a number.
`Log`	Returns the natural logarithm (base 10) of a number.
`Max`	Returns the largest value in a list of numbers.
`Mean`	Returns the average value of the items in an array or set.
`Min`	Returns the smallest value in a list of numbers.
`Modulo`	Returns the remainder after dividing a list of numbers.
`Multiply`	Returns the product of a list of numbers.
`Pow`	Returns the value of a number raised to an exponent.
`Radians`	Converts a number from degrees to radians.
`Round`	Returns the integer that is closest to a number.
`Sign`	Returns 1, 0, or -1 to indicate the sign of a number.
`Sin`	Returns the sine of a number.
`Sinh`	Returns the hyperbolic sine of a number.
`Sqrt`	Returns the square root of a number.
`Subtract`	Returns the difference of a list of numbers.
`Sum`	Sums the items in an array or set.
`Tan`	Returns the tangent of a number.
`Tanh`	Returns the hyperbolic tangent of a number.
`Trunc`	Truncates a number to the specified decimal places.

Miscellaneous

`Abort`	Terminates the current transaction.
`Class`	Returns the ref for a class (now, collection).
`Classes`	Returns an array of refs of all classes (now, collections).
`Collection`	Returns the ref for a collection.
`Collections`	Returns an array of refs of all collections.
`Database`	Returns the ref for a database.
`Databases`	Returns an array of refs of all databases.
`Documents`	Returns the set of documents within a collection.
`Function`	Returns the ref for a user-defined function.
`Functions`	Returns an array of refs of all user-defined functions.
`Index`	Returns the ref for an index.
`Indexes`	Returns an array of refs for all indexes.
`MoveDatabase`	Moves a database into another, parent database.
`NewId`	Generates a unique, numeric id.
`Query`	Defers execution of a Lambda function.
`Ref`	Returns the reference to a specific document in a collection.
`Role`	Returns the ref for a user-defined role.
`Roles`	Returns an array of refs of all user-defined roles.

Object

`Merge`	Merge two objects into one, with an optional resolver lambda.
`Select`	Retrieves a specific field value from a document.
`SelectAll`	Retrieves all values for a specific field from a document.
`ToArray`	Converts an object to an array.

Read

`Get`	Retrieves the document for the specified reference.
`KeyFromSecret`	Retrieves a key based on its secret.
`Paginate`	Returns a subset of query results.
`Select`	Retrieves a specific field value from a document.
`SelectAll`	Retrieves all values for a specific field from a document.

Set

`All`	Tests whether all of the provided values are true.
`Any`	Tests whether any of the provided values are true.
`Count`	Counts the items in an array or set.
`Difference`	Returns the set of items in one set that are missing from additional sets.
`Distinct`	Returns the set of distinct items within a set.
`Events`	Returns the set of events describing the history of a set/ref.
`Intersection`	Returns the set of items that exist in all sets.
`IsEmpty`	Tests whether an array or set is empty.
`IsNonEmpty`	Tests whether an array or set contains items.
`Join`	Combines the items in a set with set’s indexed values.
`Match`	Returns the set of items that match search terms.
`Max`	Returns the largest value in a list of numbers.
`Mean`	Returns the average value of the items in an array or set.
`Min`	Returns the smallest value in a list of numbers.
`Range`	Returns a subset of a set, in the specified range.
`Reduce`	Reduce an array or set to a result via a lambda function.
`Singleton`	Returns a set containing the first item of a set.
`Sum`	Sums the items in an array or set.
`Union`	Returns a set that combines the items in multiple sets.

String

`CaseFold`	Converts a string into a case-normalized string.
`Concat`	Combines a list of strings into a single string.
`ContainsStr`	Tests whether a string contains a specific string.
`ContainsStrRegex`	Tests whether a string contains a specific pattern.
`EndsWith`	Tests whether a string ends with a specific string.
`FindStr`	Searches for a string within a string.
`FindStrRegex`	Searches for a regex pattern within a string.
`Format`	Formats arguments as a string according to a string of format specifiers.
`LTrim`	Removes all whitespace from the start of a string.
`Length`	Returns the length in codepoints of a string.
`LowerCase`	Converts a string to all lowercase.
`RTrim`	Removes all whitespace from the end of a string.
`RegexEscape`	Creates a regular expression that matches the input string verbatim.
`Repeat`	Creates a new string by repeating a string multiple times.
`ReplaceStr`	Replaces a portion of a string with another string.
`ReplaceStrRegex`	Replaces a pattern in a string with another string.
`Space`	Creates a whitespace string of the specified size.
`StartsWith`	Tests whether a string starts with a specific string.
`SubString`	Returns a portion of a string.
`TitleCase`	Converts a string to use TitleCase.
`Trim`	Removes all whitespace from the start and end of a string.
`UpperCase`	Converts a string to all uppercase.

Time and Date

`Date`	Converts an ISO-8601 string into a Date.
`DayOfMonth`	Returns the day of the month from a timestamp.
`DayOfWeek`	Returns the day of the week from a timestamp.
`DayOfYear`	Returns the day of the year from a timestamp.
`Epoch`	Creates a timestamp from an offset since 1970-01-01 in seconds, milliseconds, microseconds, or nanoseconds.
`Hour`	Returns the hour from a timestamp.
`Minute`	Returns the minute from a timestamp.
`Month`	Returns the month from a timestamp.
`Now`	Returns a timestamp representing the current transaction time.
`Second`	Returns the second from a timestamp.
`Time`	Converts `now`, or an ISO-8601 string, into a timestamp.
`TimeAdd`	Adds an offset to a provided timestamp/date.
`TimeDiff`	Returns the difference between two timestamps/dates, in specified units.
`TimeSubtract`	Subtracts an offset from a provided timestamp/date.
`Year`	Returns the year from a timestamp.

Type checks

`IsArray`	Tests whether a value is an array.
`IsBoolean`	Tests whether a value is a boolean.
`IsBytes`	Tests whether a value is a group of bytes.
`IsCollection`	Tests whether a value is a collection ref.
`IsCredentials`	Tests whether a value is a credentials object.
`IsDatabase`	Tests whether a value is a database ref.
`IsDate`	Tests whether a value is a Date.
`IsDoc`	Tests whether a value is a document.
`IsDouble`	Tests whether a value is a double-precision, floating point number.
`IsFunction`	Tests whether a value is a function.
`IsIndex`	Tests whether a value is an index ref.
`IsInteger`	Tests whether a value is an integer number.
`IsKey`	Tests whether a value is a key ref.
`IsLambda`	Tests whether a value is a Lambda function.
`IsNull`	Tests whether a value is `null`.
`IsNumber`	Tests whether a value is numeric, which includes integers and doubles.
`IsObject`	Tests whether a value is an object.
`IsRef`	Tests whether a value is a reference.
`IsRole`	Tests whether a value is a role.
`IsSet`	Tests whether a value is a set.
`IsString`	Tests whether a value is a string.
`IsTimestamp`	Tests whether a value is a timestamp.
`IsToken`	Tests whether a value is a token ref.

Write

`Create`	Create a document in a collection.
`CreateClass`	Create a class (now, collection).
`CreateCollection`	Create a collection.
`CreateDatabase`	Create a database.
`CreateFunction`	Create a user-defined function.
`CreateIndex`	Create an index.
`CreateKey`	Create a key.
`CreateRole`	Create a user-defined role.
`Delete`	Remove a document, key, index, collection, or database.
`Insert`	Add an event to a document’s history.
`Remove`	Remove an event from a document’s history.
`Replace`	Replace an document with a new document.
`Update`	Revise specific fields within a document.

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