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Oracle

1Z0-061 · Question #198

View the Exhibit and examine the structure of CUSTOMERS and SALES tables. Evaluate the following SQL statement: UPDATE (SELECT prod_id, cust_id, quantity_sold, time_id FROM sales) SET time_id =…

The correct answer is C. It would execute and restrict modifications to only the columns specified in the SELECT statement. One UPDATE statement can change rows in only one table, but it can change any number of rows in that table.

Manipulating Data

Question

View the Exhibit and examine the structure of CUSTOMERS and SALES tables. Evaluate the following SQL statement:

UPDATE (SELECT prod_id, cust_id, quantity_sold, time_id FROM sales) SET time_id = '22-MAR-2007' WHERE cust_id = (SELECT cust_id FROM customers WHERE cust_last_name = 'Roberts' AND credit_limit = 600); Which statement is true regarding the execution of the above UPDATE statement?

Options

  • AIt would not execute because two tables cannot be used in a single UPDATE statement.
  • BIt would not execute because the SELECT statement cannot be used in place of the table name.
  • CIt would execute and restrict modifications to only the columns specified in the SELECT statement.
  • DIt would not execute because a subquery cannot be used in the WHERE clause of an UPDATE

How the community answered

(19 responses)
  • B
    11% (2)
  • C
    84% (16)
  • D
    5% (1)

Explanation

One UPDATE statement can change rows in only one table, but it can change any number of rows in that table.

Topics

#UPDATE with inline view#DML subquery#inline view#UPDATE syntax

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