array_except

array_except

array_except

description

Syntax

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

Returns an array of the elements in array1 but not in array2, without duplicates. If the input parameter is null, null is returned.

notice

Only supported in vectorized engine

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