Question: In order for two queries to be UNION - compatible, they must: Question 7 options: both output compatible data types for each column and return

In order for two queries to be UNION-compatible, they must:
Question 7 options:
both output compatible data types for each column and return the same number of rows.
both have the same number of lines in their SQL statements.
all of the above.
both return at least one row.

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