單項(xiàng)選擇題

The CUSTOMERS table has these columns:
CUSTOMER_ID NUMBER(4) NOT NULL
CUSTOMER_NAME VARCHAR2(100) NOT NULL
STREET_ADDRESS VARCHAR2(150)
CITY_ADDRESS VARCHAR2(50)
STATE_ADDRESS VARCHAR2(50)
PROVINCE_ADDRESS VARCHAR2(50)
COUNTRY_ADDRESS VARCHAR2(50)
POSTAL_CODE VARCHAR2(12)
CUSTOMER_PHONE VARCHAR2(20)
A promotional sale is being advertised to the customers in France. Which WHERE clause identifies customers that are located in France?（）

A.WHERE lower(country_address) = "france"
B.WHERE lower(country_address) = 'france'
C.WHERE lower(country_address) IS 'france'
D.WHERE lower(country_address) = '%france%'
E.WHERE lower(country_address) LIKE %france%

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單項(xiàng)選擇題

In which scenario would an index be most useful?（）

A.The indexed column is declared as NOT NULL.
B.The indexed columns are used in the FROM clause.
C.The indexed columns are part of an expression.
D.The indexed column contains a wide range of values.

單項(xiàng)選擇題

What is true regarding subqueries?（）

A.The inner query always sorts the results of the outer query.
B.The outer query always sorts the results of the inner query.
C.The outer query must return a value to the inner query.
D.The inner query returns a value to the outer query.
E.The inner query must always return a value or the outer query will give an error.

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你可能感興趣的試題

In which scenario would an index be most useful?（）

What is true regarding subqueries?（）

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