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array_sort_asc()

Receives one or more arrays. Sorts the first array in ascending order. Orders the remaining arrays to match the reordered first array.

Syntax

array_sort_asc(array1[, ..., argumentN])

array_sort_asc(array1[, ..., argumentN],nulls_last)

If nulls_last isn't provided, a default value of true is used.

Arguments

  • array1...arrayN: Input arrays.
  • nulls_last: A bool indicating whether nulls should be last

Returns

Returns the same number of arrays as in the input, with the first array sorted in ascending order, and the remaining arrays ordered to match the reordered first array.

null will be returned for every array that differs in length from the first one.

If an array contains elements of different types, it will be sorted in the following order:

  • Numeric, datetime, and timespan elements
  • String elements
  • Guid elements
  • All other elements

Example 1 - Sorting two arrays

let array1 = dynamic([1,3,4,5,2]);
let array2 = dynamic(["a","b","c","d","e"]);
print array_sort_asc(array1,array2)

Results

array1_sorted array2_sorted
[1,2,3,4,5] ["a","e","b","c","d"]

The output column names are generated automatically, based on the arguments to the function. To assign different names to the output columns, use the following syntax: ... | extend (out1, out2) = array_sort_asc(array1,array2)

Example 2 - Sorting substrings

let Names = "John,Paul,George,Ringo";
let SortedNames = strcat_array(array_sort_asc(split(Names, ",")), ",");
print result = SortedNames

Results

result
George,John,Paul,Ringo

Example 3 - Combining summarize and array_sort_asc

datatable(command:string, command_time:datetime, user_id:string)
[
    'chmod',   datetime(2019-07-15),   "user1",
    'ls',      datetime(2019-07-02),   "user1",
    'dir',     datetime(2019-07-22),   "user1",
    'mkdir',   datetime(2019-07-14),   "user1",
    'rm',      datetime(2019-07-27),   "user1",
    'pwd',     datetime(2019-07-25),   "user1",
    'rm',      datetime(2019-07-23),   "user2",
    'pwd',     datetime(2019-07-25),   "user2",
]
| summarize timestamps = make_list(command_time), commands = make_list(command) by user_id
| project user_id, commands_in_chronological_order = array_sort_asc(timestamps, commands)[1]

Results

user_id commands_in_chronological_order
user1 [
"ls",
"mkdir",
"chmod",
"dir",
"pwd",
"rm"
]
user2 [
"rm",
"pwd"
]

If your data contains null values, use make_list_with_nulls instead of make_list.

Example 4 - Controlling location of null values

By default, null values are put last in the sorted array. However, you can control it explicitly by adding a bool value as the last argument to array_sort_asc().

Example with default behavior:

print array_sort_asc(dynamic([null,"blue","yellow","green",null]))

Results

print_0
["blue","green","yellow",null,null]

Example with non-default behavior:

print array_sort_asc(dynamic([null,"blue","yellow","green",null]), false)

Results

print_0
[null,null,"blue","green","yellow"]

See also

To sort the first array in descending order, use array_sort_desc().