array_except

array_except

array_except

description

Syntax

ARRAY<T> array_except(ARRAY<T> array1, ARRAY<T> array2)

返回一个数组，包含所有在array1内但不在array2内的元素，不包含重复项，如果输入参数为NULL，则返回NULL

notice

仅支持向量化引擎中使用

example

mysql> select k1,k2,k3,array_except(k2,k3) from array_type_table;
+------+-----------------+--------------+--------------------------+
| k1   | k2              | k3           | array_except(`k2`, `k3`) |
+------+-----------------+--------------+--------------------------+
|    1 | [1, 2, 3]       | [2, 4, 5]    | [1, 3]                   |
|    2 | [2, 3]          | [1, 5]       | [2, 3]                   |
|    3 | [1, 1, 1]       | [2, 2, 2]    | [1]                      |
+------+-----------------+--------------+--------------------------+

mysql> select k1,k2,k3,array_except(k2,k3) from array_type_table_nullable;
+------+-----------------+--------------+--------------------------+
| k1   | k2              | k3           | array_except(`k2`, `k3`) |
+------+-----------------+--------------+--------------------------+
|    1 | [1, NULL, 3]    | [1, 3, 5]    | [NULL]                   |
|    2 | [NULL, NULL, 2] | [2, NULL, 4] | []                       |
|    3 | NULL            | [1, 2, 3]    | NULL                     |
+------+-----------------+--------------+--------------------------+

mysql> select k1,k2,k3,array_except(k2,k3) from array_type_table_varchar;
+------+----------------------------+----------------------------------+--------------------------+
| k1   | k2                         | k3                               | array_except(`k2`, `k3`) |
+------+----------------------------+----------------------------------+--------------------------+
|    1 | ['hello', 'world', 'c++']  | ['I', 'am', 'c++']               | ['hello', 'world']       |
|    2 | ['a1', 'equals', 'b1']     | ['a2', 'equals', 'b2']           | ['a1', 'b1']             |
|    3 | ['hasnull', NULL, 'value'] | ['nohasnull', 'nonull', 'value'] | ['hasnull', NULL]        |
|    3 | ['hasnull', NULL, 'value'] | ['hasnull', NULL, 'value']       | []                       |
+------+----------------------------+----------------------------------+--------------------------+

mysql> select k1,k2,k3,array_except(k2,k3) from array_type_table_decimal;
+------+------------------+-------------------+--------------------------+
| k1   | k2               | k3                | array_except(`k2`, `k3`) |
+------+------------------+-------------------+--------------------------+
|    1 | [1.1, 2.1, 3.44] | [2.1, 3.4, 5.4]   | [1.1, 3.44]              |
|    2 | [NULL, 2, 5]     | [NULL, NULL, 5.4] | [2, 5]                   |
|    1 | [1, NULL, 2, 5]  | [1, 3.1, 5.4]     | [NULL, 2, 5]             |
+------+------------------+-------------------+--------------------------+

keywords

ARRAY,EXCEPT,ARRAY_EXCEPT