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Oracle Database SQL 認定 1z0-071 試験問題 (Q176-Q181):

質問 # 176
View the exhibit and examine the structure in ORDERS and ORDER_ITEMS tables.

You need to create a view that displays the ORDER_ID, ORDER_DATE, and the total number of items in each order.
Which CREATE VIEW statement would create the view successfully?

A. CREATE OR REPLACE VIEW ord_vuAS SELECT o.order_id, o.order_date,
COUNT(i.line_item_id)"NO OF ITEMS"FROM orders o JOIN order_items iON (o.order_id = i.order_id)GROUP BY o.order_id,o.order_date;
B. CREATE OR REPLACE VIEW ord_vu (order_id, order_date)AS SELECT o.order_id, o.order_date, COUNT(i.line_item_id)"NO OF ITEMS"FROM orders o JOIN order_items iON (o.order_id = i.order_id)GROUP BY o.order_id, o.order_date;
C. CREATE OR REPLACE VIEW ord_vuAS SELECT o.order_id, o.order_date,
COUNT(i.line_item_id)FROM orders o JOIN order_items iON (o.order_id = i.order_id)GROUP BY o.order_id,o.order_date;
D. CREATE OR REPLACE VIEW ord_vuAS SELECT o.order_id, o.order_date,
COUNT(i.line_item_id)||'NO OF ITEMS'FROM orders o JOIN order_items iON (o.order_id = i.order_id)GROUP BY o.order_id,o.order_dateWHITH CHECK OPTION;

正解：A

質問 # 177
Which three queries use valid expressions?

A. SELECT product_id,(expiry_date - delivery_date) * 2 FROM products;
B. SELECT product_id,unit_price || 5 "Discount" , unit_price + surcharge - discount FROM products;
C. SELECT product_id,unit_price,5 "Discount", unit_price + surcharge-discount FROM products;
D. SELECT product_id, unit_price, unit_price + surcharge FROM products;
E. SELECT product_id, expiry_date * 2 from products;
F. SELECT product_id,(unit_price * 0.15 / (4.75 + 552.25)) FROM products;

正解：A、D、F

質問 # 178
You execute this query:

What is the result?

A. It generates an error.
B. It executes successfully but does not return any result.
C. It returns the date for the first Monday of the next month.
D. It returns the date for the last Monday of the current month.

正解：C

質問 # 179
Evaluate the following SELECT statement and view the Exhibit to examine its output:

SELECT constraint_name, constraint_type, search_condition, r_constraint_name, delete_rule, status FROM user_constraints WHERE table_name = ORDERS
Which two statements are true about the output? (Choose two.)

A. The R_CONSTRAINT_NAME column gives the alternative name for the constraint.
B. In the second column, indicates a check constraint.
C. The column DELETE_RULE decides the state of the related rows in the child table when the corresponding row is deleted from the parent table.
D. The STATUS column indicates whether the table is currently in use.

正解：B、C

質問 # 180
The INVOICE table has a QTY_SOLD column of data type NUMBER and an INVOICE_DATE column of data type DATE NLS_DATE_FORMAT is set to DD-MON-RR.
Which two are true about data type conversions involving these columns in query expressions?

A. CONCAT(qty_sold, invoice_date): requires explicit conversion
B. qty_sold ='05549821 ': requires explicit conversion
C. invoice_date = '15-march-2019': uses implicit conversion
D. invoice_date> '01-02-2019': uses implicit conversion
E. qty_sold BETWEEN '101' AND '110': uses implicit conversion

正解：C、D

解説：
The statements regarding data type conversions and the treatment of literals in SQL expressions involve understanding implicit and explicit data conversions in Oracle SQL.
Statement A is true as invoice_date > '01-02-2019' involves an implicit conversion of the string literal to a date type, based on the NLS_DATE_FORMAT setting, assuming the format matches.
Statement E is true because, similarly to A, invoice_date = '15-march-2019' involves an implicit conversion where the string is automatically converted to a date type according to the Oracle NLS_DATE_FORMAT or an assumed default date format.
Statements B, C, and D involve incorrect or misleading information:
B (qty_sold = '05549821') is misleading and potentially incorrect as leading zeros in a numeric context do not typically require explicit conversion but the presence of spaces might suggest a need for trimming rather than numeric conversion.
C (CONCAT(qty_sold, invoice_date)) would indeed require explicit conversion because CONCAT expects string types, and thus numerical and date values must be explicitly converted to strings before concatenation.
D (qty_sold BETWEEN '101' AND '110') uses implicit conversion where the string literals '101' and '110' are implicitly converted to numbers if qty_sold is a numeric type.

質問 # 181
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