Issuing 'SELECT' on a MERGE table is like . . . . . . . .

Solution (By Examveda Team)

This question asks about what happens when you use a SELECT statement on a MERGE table in MySQL.

A MERGE table is a special type of table in MySQL that combines data from multiple tables. It's like a "super table" that contains data from different sources.

When you use SELECT on a MERGE table, it's like you are combining the data from those original tables into a single result set.

Now, let's look at the options:

Option A: UNION
UNION combines the results of multiple queries, removing duplicate rows.

Option B: UNION ALL
UNION ALL combines the results of multiple queries, including duplicate rows.

Option C: UNION DISTINCT
UNION DISTINCT is the same as UNION, removing duplicate rows.

Option D: JOIN
JOIN combines data from two or more tables based on a shared column.

The answer is Option B: UNION ALL. When you use SELECT on a MERGE table, it's like combining the data from the original tables, including duplicates. This is similar to how UNION ALL works, combining all data from multiple queries.

Think of it like this: A MERGE table is like a big basket containing fruits from different sources. When you use SELECT on it, you're getting all the fruits, even if some are the same type, just like UNION ALL keeps all rows, even if they are duplicates.