array_shuffle
array_shuffle
array_shuffle shuffle
description
Syntax
ARRAY<T> array_shuffle(ARRAY<T> array1, [INT seed])
ARRAY<T> shuffle(ARRAY<T> array1, [INT seed])
将数组中元素进行随机排列。其中，参数array1为要进行随机排列的数组，可选参数seed是设定伪随机数生成器用于生成伪随机数的初始数值。 shuffle与array_shuffle功能相同。
array_shuffle(array1);
array_shuffle(array1, 0);
shuffle(array1);
shuffle(array1, 0);
example
mysql [test]> select c_array1, array_shuffle(c_array1) from array_test;
+-----------------------+---------------------------+
| c_array1 | array_shuffle(`c_array1`) |
+-----------------------+---------------------------+
| [1, 2, 3, 4, 5, NULL] | [2, NULL, 5, 3, 4, 1] |
| [6, 7, 8, NULL] | [7, NULL, 8, 6] |
| [1, NULL] | [1, NULL] |
| NULL | NULL |
+-----------------------+---------------------------+
4 rows in set (0.01 sec)
MySQL [test]> select c_array1, array_shuffle(c_array1, 0) from array_test;
+-----------------------+------------------------------+
| c_array1 | array_shuffle(`c_array1`, 0) |
+-----------------------+------------------------------+
| [1, 2, 3, 4, 5, NULL] | [1, 3, 2, NULL, 4, 5] |
| [6, 7, 8, NULL] | [6, 8, 7, NULL] |
| [1, NULL] | [1, NULL] |
| NULL | NULL |
+-----------------------+------------------------------+
4 rows in set (0.01 sec)
keywords
ARRAY,ARRAY_SHUFFLE,SHUFFLE
