ARRAY_SORTBY

array_sortby

array_sortby

description

Syntax

ARRAY<T> array_sortby(ARRAY<T> src,Array<T> key)
ARRAY<T> array_sortby(lambda,array....)

首先将 key 列升序排列，然后将 src 列按此顺序排序后的对应列做为结果返回; 如果输入数组 src 为 NULL，则返回 NULL。 如果输入数组 key 为 NULL，则直接返回 src 数组。 如果输入数组 key 元素包含 NULL, 则输出的排序数组会将 NULL 放在最前面。

example

mysql [test]>select array_sortby(['a','b','c'],[3,2,1]);
+----------------------------------------------------+
| array_sortby(ARRAY('a', 'b', 'c'), ARRAY(3, 2, 1)) |
+----------------------------------------------------+
| ['c', 'b', 'a']                                    |
+----------------------------------------------------+

mysql [test]>select array_sortby([1,2,3,4,5],[10,5,1,20,80]);
+-------------------------------------------------------------+
| array_sortby(ARRAY(1, 2, 3, 4, 5), ARRAY(10, 5, 1, 20, 80)) |
+-------------------------------------------------------------+
| [3, 2, 1, 4, 5]                                             |
+-------------------------------------------------------------+

mysql [test]>select *,array_sortby(c_array1,c_array2) from test_array_sortby order by id;
+------+-----------------+-------------------------+--------------------------------------+
| id   | c_array1        | c_array2                | array_sortby(`c_array1`, `c_array2`) |
+------+-----------------+-------------------------+--------------------------------------+
|    0 | NULL            | [2]                     | NULL                                 |
|    1 | [1, 2, 3, 4, 5] | [10, 20, -40, 80, -100] | [5, 3, 1, 2, 4]                      |
|    2 | [6, 7, 8]       | [10, 12, 13]            | [6, 7, 8]                            |
|    3 | [1]             | [-100]                  | [1]                                  |
|    4 | NULL            | NULL                    | NULL                                 |
|    5 | [3]             | NULL                    | [3]                                  |
|    6 | [1, 2]          | [2, 1]                  | [2, 1]                               |
|    7 | [NULL]          | [NULL]                  | [NULL]                               |
|    8 | [1, 2, 3]       | [3, 2, 1]               | [3, 2, 1]                            |
+------+-----------------+-------------------------+--------------------------------------+

mysql [test]>select *, array_map((x,y)->(y+x),c_array1,c_array2) as arr_sum,array_sortby((x,y)->(y+x),c_array1,c_array2) as arr_sort from array_test2;
+------+-----------------+--------------+----------------+-----------------+
| id   | c_array1        | c_array2     | arr_sum        | arr_sort        |
+------+-----------------+--------------+----------------+-----------------+
|    1 | [1, 2, 3]       | [10, 11, 12] | [11, 13, 15]   | [1, 2, 3]       |
|    2 | [4, 3, 5]       | [10, 20, 30] | [14, 23, 35]   | [4, 3, 5]       |
|    3 | [-40, 30, -100] | [30, 10, 20] | [-10, 40, -80] | [-100, -40, 30] |
+------+-----------------+--------------+----------------+-----------------+

keywords

ARRAY, SORT, ARRAY_SORTBY