Online Access Free Oracle.1z1-071.v2022-04-29.q239 Practice Test (Page 43)

1z1-071 Exam Question 206

Which three statements are true regarding indexes? (Choose three.)

A.An update to a table can result in updates to any or all of the table's indexes

B.A UNIQUEindex can be altered to be non-unique

C.A table belonging to one user can have an index that belongs to a different user

D.A SELECTstatement can access one or more indices without accessing any tables

E.An update to a table can result in no updates to any of the table's indexes

F.When a table is dropped and is moved to the RECYCLE BIN, all indexes built on that table are permanently dropped

1z1-071 Exam Question 207

View the Exhibit and examine the structure of ORDER_ITEMS and ORDERS tables.

You need to remove from the ORDER_ITEMS table those rows that have an order status of 0 or 1 in the ORDERS table.
Which two DELETE statements are valid (Choose two.)

A.DELETE FROM order_items iWHERE order_id = (SELECT order_id FROM orders oWHERE i.order_id = o.order_id AND order_status IN (0,1));

B.DELETEFROM order_itemsWHERE order_id IN (SELECT order_idFROM ordersWHERE orders_status in (0,1));

C.DELETEFROM (SELECT * FROM order_items I,orders oWHERE i.order_id = o.order_id AND order_status IN (0,1));

D.DELETE *FROM order_itemsWHERE order_id IN (SELECT order_id)FROM ordersWHERE order_status IN (0,1));

1z1-071 Exam Question 208

Which three actions can you perform on an existing table containing data? (Choose three.)

A.Change the default value of a column

B.Change a DATE column containing data to a NUMBER data type

C.Add a new NOT NULL column with a DEFAULT value

D.Increase the width of a numeric column

E.Add a new column as the table's first column

F.Define a default value that is automatically inserted into a column containing nulls

1z1-071 Exam Question 209

Evaluate the following SQL statement:

Which statement is true regarding the outcome of the above query?

A.It executes successfully and displays rows in the descending order of PROMO_CATEGORY.

B.It executes successfully but ignores the ORDER BYclause because it is not located at the end of the compound statement.

C.It produces an error because the ORDER BYclause should appear only at the end of a compound query- that is, with the last SELECTstatement.

D.It produces an error because positional notation cannot be used in the ORDER BYclause with SET operators.

1z1-071 Exam Question 210

Which two statements are true regarding the GROUP BY clause in a SQL statement? (Choose two.)

A.The GROUP BY clause is mandatory if you are using an aggregate function in the SELECT clause.

B.Using the WHERE clause before the GROUP BY clause excludes the rows before creating groups.

C.Using the WHERE clause after the GROUP BY clause excludes the rows after creating groups.

D.You can use column alias in the GROUP BY clause.

E.If the SELECT clause has an aggregate function, then those individual columns without an aggregate function in the SELECT clause should be included in the GROUP BY clause.

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