Knowledge check

Choose the best response for each of the questions below.

Check your knowledge

Which join flavor contains a row in the output for every combination of matching rows from left and right?

kind=leftouter

kind=inner

kind=fullouter

When you're using the join operator, how do you specify fields from each table?

$1.columname and $2.columnname

$left.columname and $right.columnname

$inner.columname and $outer.columnname

When you use union on two tables, do the two tables need matching columns?

No.

Yes.

Only when the project operator is used.

You must answer all questions before checking your work.