array_intersect
array_intersect
description
Syntax
ARRAY<T> array_intersect(ARRAY<T> array1, ARRAY<T> array2)
返回一个数组，包含array1和array2的交集中的所有元素，不包含重复项，如果输入参数为NULL，则返回NULL
example
mysql> select k1,k2,k3,array_intersect(k2,k3) from array_type_table;
+------+-----------------+--------------+-----------------------------+
| k1 | k2 | k3 | array_intersect(`k2`, `k3`) |
+------+-----------------+--------------+-----------------------------+
| 1 | [1, 2, 3] | [2, 4, 5] | [2] |
| 2 | [2, 3] | [1, 5] | [] |
| 3 | [1, 1, 1] | [2, 2, 2] | [] |
+------+-----------------+--------------+-----------------------------+
mysql> select k1,k2,k3,array_intersect(k2,k3) from array_type_table_nullable;
+------+-----------------+--------------+-----------------------------+
| k1 | k2 | k3 | array_intersect(`k2`, `k3`) |
+------+-----------------+--------------+-----------------------------+
| 1 | [1, NULL, 3] | [1, 3, 5] | [1, 3] |
| 2 | [NULL, NULL, 2] | [2, NULL, 4] | [NULL, 2] |
| 3 | NULL | [1, 2, 3] | NULL |
+------+-----------------+--------------+-----------------------------+
mysql> select k1,k2,k3,array_intersect(k2,k3) from array_type_table_varchar;
+------+----------------------------+----------------------------------+-----------------------------+
| k1 | k2 | k3 | array_intersect(`k2`, `k3`) |
+------+----------------------------+----------------------------------+-----------------------------+
| 1 | ['hello', 'world', 'c++'] | ['I', 'am', 'c++'] | ['c++'] |
| 2 | ['a1', 'equals', 'b1'] | ['a2', 'equals', 'b2'] | ['equals'] |
| 3 | ['hasnull', NULL, 'value'] | ['nohasnull', 'nonull', 'value'] | [NULL, 'value'] |
| 3 | ['hasnull', NULL, 'value'] | ['hasnull', NULL, 'value'] | ['hasnull', 'value'] |
+------+----------------------------+----------------------------------+-----------------------------+
mysql> select k1,k2,k3,array_intersect(k2,k3) from array_type_table_decimal;
+------+------------------+-------------------+-----------------------------+
| k1 | k2 | k3 | array_intersect(`k2`, `k3`) |
+------+------------------+-------------------+-----------------------------+
| 1 | [1.1, 2.1, 3.44] | [2.1, 3.4, 5.4] | [2.1] |
| 2 | [NULL, 2, 5] | [NULL, NULL, 5.4] | [NULL] |
| 3 | [1, NULL, 2, 5] | [1, 3.1, 5.4] | [1] |
+------+------------------+-------------------+-----------------------------+
keywords
ARRAY,INTERSECT,ARRAY_INTERSECT