Database programming section 7 quiz

  • What is the minimum number of join conditions required to join 5 tables together 5?

    4 joins.
    Think of it as fence panels and fenceposts.
    The tables are fenceposts.
    If you have 5 fenceposts, You will need 4 panels to fill the gaps..

  • When merging 3 tables in a SELECT statement how many join conditions are required in the where clause?

    Join or not join the where condition purpose is filtering resulting rows.
    You can join more than 2 tables and not having a where condition.
    This, of course, if you use the SQL 92 join syntax.
    If you use the SQL 89 join syntax, why?, then you need at least two where conditions to join three tables..

  • Which operator is typically used in a Nonequijoin?

    The SQL NON EQUI JOIN uses comparison operator instead of the equal sign like \x26gt;, \x26lt;, \x26gt;=, \x26lt;= along with conditions..

  • You apply the outer join operator (+) in parentheses following a column name within predicates that refer to columns from two tables, as shown in the following examples: The following query performs a left outer join of tables T1 and T2.
    Include both tables in the FROM clause, separated by a comma.

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