MMAX (window)
Syntax
MMAX( value, rows_1 [ , rows_2 ] )MMAX( value, rows_1 [ , rows_2 ] [ TOTAL | WITHIN ... | AMONG ... ] [ ORDER BY ... ] [ BEFORE FILTER BY ... ] )More info:
Description
Warning
The sorting order is based on the fields listed in the sorting section of the chart and in the ORDER BY clause. First, ORDER BY fields are used, and then they are complemented by the fields from the chart.
Returns the moving maximum of values in a fixed-size window defined by the sort order and arguments:
rows_1 | rows_2 | Window |
|---|---|---|
| positive | - | The current row and rows_1 preceding rows. |
| negative | - | The current row and -rows_1 following rows. |
| any sign | any sign | rows_1 preceding rows, the current row and rows_2 following rows. |
Window functions with a similar behavior: MSUM, MCOUNT, MMIN, MAVG.
Argument types:
value—Boolean | Date | Datetime | Fractional number | Integer | String | UUIDrows_1—Integerrows_2—Integer
Return type: Same type as (value)
Note
Only constant values are accepted for the arguments (rows_1, rows_2).
Examples
Source data
| Date | City | Category | Orders | Profit |
|---|---|---|---|---|
'2019-03-01' | 'London' | 'Office Supplies' | 8 | 120.80 |
'2019-03-04' | 'London' | 'Office Supplies' | 2 | 100.00 |
'2019-03-05' | 'London' | 'Furniture' | 1 | 750.00 |
'2019-03-02' | 'Moscow' | 'Furniture' | 2 | 1250.50 |
'2019-03-03' | 'Moscow' | 'Office Supplies' | 4 | 85.00 |
'2019-03-01' | 'San Francisco' | 'Office Supplies' | 23 | 723.00 |
'2019-03-01' | 'San Francisco' | 'Furniture' | 1 | 1000.00 |
'2019-03-03' | 'San Francisco' | 'Furniture' | 4 | 4000.00 |
'2019-03-02' | 'Detroit' | 'Furniture' | 5 | 3700.00 |
'2019-03-04' | 'Detroit' | 'Office Supplies' | 25 | 1200.00 |
'2019-03-04' | 'Detroit' | 'Furniture' | 2 | 3500.00 |
Grouped by [City].
Sorted by [City].
Result
| [City] | SUM([Orders]) | MMAX(SUM([Orders]), 1) | MMAX(SUM([Orders]), -2) | MMAX(SUM([Orders]) 1, 1) |
|---|---|---|---|---|
'Detroit' | 32 | 32 | 32 | 32 |
'London' | 11 | 32 | 28 | 32 |
'Moscow' | 6 | 11 | 28 | 28 |
'San Francisco' | 28 | 28 | 28 | 28 |
Source data
| Date | City | Category | Orders | Profit |
|---|---|---|---|---|
'2019-03-01' | 'London' | 'Office Supplies' | 8 | 120.80 |
'2019-03-04' | 'London' | 'Office Supplies' | 2 | 100.00 |
'2019-03-05' | 'London' | 'Furniture' | 1 | 750.00 |
'2019-03-02' | 'Moscow' | 'Furniture' | 2 | 1250.50 |
'2019-03-03' | 'Moscow' | 'Office Supplies' | 4 | 85.00 |
'2019-03-01' | 'San Francisco' | 'Office Supplies' | 23 | 723.00 |
'2019-03-01' | 'San Francisco' | 'Furniture' | 1 | 1000.00 |
'2019-03-03' | 'San Francisco' | 'Furniture' | 4 | 4000.00 |
'2019-03-02' | 'Detroit' | 'Furniture' | 5 | 3700.00 |
'2019-03-04' | 'Detroit' | 'Office Supplies' | 25 | 1200.00 |
'2019-03-04' | 'Detroit' | 'Furniture' | 2 | 3500.00 |
Grouped by [City].
Sorted by [City].
Result
| [City] | SUM([Orders]) | MMAX(SUM([Orders]), 1 ORDER BY [City] DESC) | MMAX(SUM([Orders]), 1 ORDER BY [Order Sum]) |
|---|---|---|---|
'Detroit' | 32 | 32 | 32 |
'London' | 11 | 11 | 11 |
'Moscow' | 6 | 28 | 6 |
'San Francisco' | 28 | 28 | 28 |
Source data
| Date | City | Category | Orders | Profit |
|---|---|---|---|---|
'2019-03-01' | 'London' | 'Office Supplies' | 8 | 120.80 |
'2019-03-04' | 'London' | 'Office Supplies' | 2 | 100.00 |
'2019-03-05' | 'London' | 'Furniture' | 1 | 750.00 |
'2019-03-02' | 'Moscow' | 'Furniture' | 2 | 1250.50 |
'2019-03-03' | 'Moscow' | 'Office Supplies' | 4 | 85.00 |
'2019-03-01' | 'San Francisco' | 'Office Supplies' | 23 | 723.00 |
'2019-03-01' | 'San Francisco' | 'Furniture' | 1 | 1000.00 |
'2019-03-03' | 'San Francisco' | 'Furniture' | 4 | 4000.00 |
'2019-03-02' | 'Detroit' | 'Furniture' | 5 | 3700.00 |
'2019-03-04' | 'Detroit' | 'Office Supplies' | 25 | 1200.00 |
'2019-03-04' | 'Detroit' | 'Furniture' | 2 | 3500.00 |
Grouped by [City], [Category].
Sorted by [City], [Category].
Result
| [City] | [Category] | SUM([Orders]) | MMAX(SUM([Orders]), 1 TOTAL ORDER BY [City], [Category]) | MMAX(SUM([Orders]), 1 WITHIN [City] ORDER BY [Category]) | MMAX(SUM([Orders]), 1 AMONG [City] ORDER BY [City]) |
|---|---|---|---|---|---|
'Detroit' | 'Furniture' | 7 | 7 | 7 | 7 |
'Detroit' | 'Office Supplies' | 25 | 25 | 25 | 25 |
'London' | 'Furniture' | 1 | 25 | 1 | 7 |
'London' | 'Office Supplies' | 10 | 10 | 10 | 25 |
'Moscow' | 'Furniture' | 2 | 10 | 2 | 2 |
'Moscow' | 'Office Supplies' | 4 | 4 | 4 | 10 |
'San Francisco' | 'Furniture' | 5 | 5 | 5 | 5 |
'San Francisco' | 'Office Supplies' | 23 | 23 | 23 | 23 |
Data source support
ClickHouse 21.8, Microsoft SQL Server 2017 (14.0), MySQL 5.7, Oracle Database 12c (12.1), PostgreSQL 9.3.