# Find The Subtasks That Did Not Execute Problem

## Description

LeetCode Problem 1767.

``````1
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+----------------+---------+
| Column Name    | Type    |
+----------------+---------+
+----------------+---------+
task_id is the primary key for this table.
It is guaranteed that 2 <= subtasks_count <= 20.

Table: Executed

+---------------+---------+
| Column Name   | Type    |
+---------------+---------+
+---------------+---------+
``````

Write an SQL query to report the IDs of the missing subtasks for each task_id.

Return the result table in any order.

The query result format is in the following example:

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+---------+----------------+
+---------+----------------+
| 1       | 3              |
| 2       | 2              |
| 3       | 4              |
+---------+----------------+

Executed table:
+---------+------------+
+---------+------------+
| 1       | 2          |
| 3       | 1          |
| 3       | 2          |
| 3       | 3          |
| 3       | 4          |
+---------+------------+

Result table:
+---------+------------+
+---------+------------+
| 1       | 1          |
| 1       | 3          |
| 2       | 1          |
| 2       | 2          |
+---------+------------+
Task 1 was divided into 3 subtasks (1, 2, 3). Only subtask 2 was executed successfully, so we include (1, 1) and (1, 3) in the answer.
Task 2 was divided into 2 subtasks (1, 2). No subtask was executed successfully, so we include (2, 1) and (2, 2) in the answer.
Task 3 was divided into 4 subtasks (1, 2, 3, 4). All of the subtasks were executed successfully.
``````

## MySQL Solution

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join (
) x
)
``````