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Window Functions
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MariaDB starting with 10.2
Window functions were first introduced in MariaDB 10.2.0.
Note: The documentation is still in progress, and not all features have been added yet.
Window functions perform calculations across a set of rows related to the current row
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Window Functions Overview
Window functions perform calculations across a set of rows related to the current row. -
AVG
Returns the average value. -
BIT_AND
Bitwise AND. -
BIT_OR
Bitwise OR. -
BIT_XOR
Bitwise XOR. -
COUNT
Returns count of non-null values. -
CUME_DIST
Window function that returns the cumulative distribution of a given row. -
DENSE_RANK
Rank of a given row with identical values receiving the same result, no skipping. -
FIRST_VALUE
Returns the first result from an ordered set. -
JSON_ARRAYAGG
Returns a JSON array containing an element for each value in a given set of JSON or SQL values. -
JSON_OBJECTAGG
Returns a JSON object containing key-value pairs. -
LAG
Accesses data from a previous row in the same result set without the need for a self-join. -
LAST_VALUE
Returns the last value in a list or set of values. -
LEAD
Accesses data from a following row in the same result set without the need for a self-join. -
MAX
Returns the maximum value. -
MEDIAN
Window function that returns the median value of a range of values. -
MIN
Returns the minimum value. -
NTH_VALUE
Returns the value evaluated at the specified row number of the window frame. -
NTILE
Returns an integer indicating which group a given row falls into. -
PERCENT_RANK
Window function that returns the relative percent rank of a given row. -
PERCENTILE_CONT
Continuous percentile. -
PERCENTILE_DISC
Discrete percentile. -
RANK
Rank of a given row with identical values receiving the same result. -
ROW_NUMBER
Row number of a given row with identical values receiving a different result. -
STD
Population standard deviation. -
STDDEV
Population standard deviation. -
STDDEV_POP
Returns the population standard deviation. -
STDDEV_SAMP
Standard deviation. -
SUM
Sum total. -
VAR_POP
Population standard variance. -
VAR_SAMP
Returns the sample variance. -
VARIANCE
Population standard variance. -
Aggregate Functions as Window Functions
It is possible to use aggregate functions as window functions. -
ColumnStore Window Functions
Summary of window function use with the ColumnStore engine -
Window Frames
Some window functions operate on window frames.
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