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Computes a specified quartile across all row values in a column or group. Input column can be of Integer or Decimal.

If a row contains a missing or null value, it is not factored into the calculation. If the entire column contains no values, the function returns a null value.
When used in a pivot transform, the function is computed for each instance of the value specified in the group parameter. See Pivot Transform.

Quartiles are computed as follows:

quartile(myScores, 3, linear)

Output: Computes the value that is at the 3rd quartile across all values in the myScores column.

quartile(function_col_ref,num_quartile,interpolation_method) [group:group_col_ref] [limit:limit_count]

Argument	Required?	Data Type	Description
function_col_ref	Y	string	Name of column to which to apply the function
num_quartile	Y	integer	Integer value (0-3) of the quartile to compute
interpolation_method	Y	enum	Method by which to interpolate values between two row values. See below.

For more information on the group and limit parameters, see Pivot Transform.

Name of the column the values of which you want to calculate the quartile. Column must contain Integer or Decimal values.

Required?	Data Type	Example Value
Yes	String (column reference)	`precipitationIn`

Integer literal value indicating the quartile that you wish to compute. Input value must be between 0 and 3, inclusive.

Required?	Data Type	Example Value
Yes	Integer	`3`

Method of interpolation between each discrete value. The list of support methods is the following:

Interpolation method	Description
`linear`	Quartiles are calculated between two discrete values in a linear fashion.
`exclusive`	Excludes 0 (0th percentile) and 1 (100th percentile) from calculation of quartiles.
`inclusive`	Includes 0 (0th percentile) and 1 (100th percentile) from calculation of quartiles.
`lower`	Use the lower value when the computed value falls between two discrete values.
`upper`	Use the upper value when the computed value falls between two discrete values.
`midpoint`	Use the midpoint value when the computed value falls between two discrete values.

Required?	Data Type	Example Value
Yes	Enum	`linear`