Junior — Middle
Can you give an example of minimal data merging in a system?
sobes.tech AI
Answer from AI
The minimum data join is the process of combining two or more datasets based on a common attribute, where the resulting set contains only those records that are present in all original sets.
Example: there are two tables with users and their orders.
| UserID | Name |
|---|---|
| 1 | Ivan |
| 2 | Olga |
| UserID | OrderID |
|---|---|
| 1 | 1001 |
| 3 | 1002 |
The minimum join (INNER JOIN) on UserID will give:
| UserID | Name | OrderID |
|---|---|---|
| 1 | Ivan | 1001 |
Only the user with UserID=1 is present in both tables.
In QA, this is important for verifying the correctness of relationships and data integrity during integration testing.