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FROM Specifies that a table, view, or derived table source is used to provide the criteria for the update operation. If the object being updated is the same as the object in the FROM clause and there is only one reference to the object in the FROM clause, an object alias may or may not be specified.If the object being updated appears more than one time in the FROM clause, one, and only one, reference to the object must not specify a table alias.Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site (the association bonus does not count).Would you like to answer one of these unanswered questions instead?After each exercise, we provide the solution so you can check your answer.
For more information, see WITH common_table_expression (Transact-SQL). For information about table hints, see Table Hints (Transact-SQL).
The trick is that when you do select * from a pair of tables with duplicate column names, the 2nd one will get named _1.