array_difference

功能

对于数值型数组，返回相邻两个元素的差(从后者中减去前者)构成的数组。

语法

output array_difference(input)

参数说明

• input：数值型数组。

返回值说明

类型为 ARRAY (与输入 input 保持一致)，内容为将输入 input 中相邻两元素的差，长度与 input 保持一致。

示例

示例一:

mysql> SELECT array_difference([342, 32423, 213, 23432]);
+-----------------------------------------+
| array_difference([342,32423,213,23432]) |
+-----------------------------------------+
| [0,32081,-32210,23219]                  |
+-----------------------------------------+

示例二:

mysql> SELECT array_difference([342, 32423, 213, null, 23432]);
+----------------------------------------------+
| array_difference([342,32423,213,NULL,23432]) |
+----------------------------------------------+
| [0,32081,-32210,null,null]                   |
+----------------------------------------------+

示例三:

mysql> SELECT array_difference([1.2, 2.3, 3.2, 4324242.55]);
+--------------------------------------------+
| array_difference([1.2,2.3,3.2,4324242.55]) |
+--------------------------------------------+
| [0,1.1,0.9,4324239.35]                     |
+--------------------------------------------+

示例四:

mysql> SELECT array_difference([false, true, false]);
+----------------------------------------+
| array_difference([FALSE, TRUE, FALSE]) |
+----------------------------------------+
| [0,1,-1]                               |
+----------------------------------------+