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76 lines
1.9 KiB
HTML
76 lines
1.9 KiB
HTML
<p>Table: <code>Employees</code></p>
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<pre>
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+---------------+---------+
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| Column Name | Type |
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+---------------+---------+
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| id | int |
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| name | varchar |
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+---------------+---------+
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id is the primary key (column with unique values) for this table.
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Each row of this table contains the id and the name of an employee in a company.
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</pre>
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<p> </p>
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<p>Table: <code>EmployeeUNI</code></p>
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<pre>
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+---------------+---------+
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| Column Name | Type |
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+---------------+---------+
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| id | int |
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| unique_id | int |
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+---------------+---------+
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(id, unique_id) is the primary key (combination of columns with unique values) for this table.
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Each row of this table contains the id and the corresponding unique id of an employee in the company.
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</pre>
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<p> </p>
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<p>Write a solution to show the <strong>unique ID </strong>of each user, If a user does not have a unique ID replace just show <code>null</code>.</p>
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<p>Return the result table in <strong>any</strong> order.</p>
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<p>The result format is in the following example.</p>
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<p> </p>
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<p><strong class="example">Example 1:</strong></p>
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<pre>
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<strong>Input:</strong>
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Employees table:
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+----+----------+
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| id | name |
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+----+----------+
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| 1 | Alice |
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| 7 | Bob |
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| 11 | Meir |
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| 90 | Winston |
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| 3 | Jonathan |
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+----+----------+
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EmployeeUNI table:
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+----+-----------+
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| id | unique_id |
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+----+-----------+
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| 3 | 1 |
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| 11 | 2 |
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| 90 | 3 |
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+----+-----------+
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<strong>Output:</strong>
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+-----------+----------+
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| unique_id | name |
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+-----------+----------+
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| null | Alice |
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| null | Bob |
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| 2 | Meir |
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| 3 | Winston |
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| 1 | Jonathan |
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+-----------+----------+
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<strong>Explanation:</strong>
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Alice and Bob do not have a unique ID, We will show null instead.
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The unique ID of Meir is 2.
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The unique ID of Winston is 3.
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The unique ID of Jonathan is 1.
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</pre>
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