多项选择题
Which two statements are true regarding the ORDER BY clause? （）
A.The sort is in ascending by order by default.
B.The sort is in descending order by default.
C.The ORDER BY clause must precede the WHERE clause.
D.The ORDER BY clause is executed on the client side.
E.The ORDER BY clause comes last in the SELECT statement.
F.The ORDER BY clause is executed first in the query execution.
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多项选择题
Which two tasks can your perform by using the TO_CHAR function? （）
A. Convert 10 to 'TEN'
B. Convert '10' to 10
C. Convert '10' to '10'
D. Convert 'TEN' to 10
E. Convert a date to a character expression
F. Convert a character expression to a date -
多项选择题
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) The CUSTOMER_ID column is the primary key for the table. Which two statements find the number of customers? （）
A. SELECT TOTAL(*) FROM customer;
B. SELECT COUNT(*) FROM customer;
C. SELECT TOTAL(customer_id) FROM customer;
D. SELECT COUNT(customer_id) FROM customer;
E. SELECT COUNT(customers) FROM customer;
F. SELECT TOTAL(customer_name) FROM customer; -
多项选择题
Which four statements correctly describe functions that are available in SQL? （）
A. INSTR returns the numeric position of a named character.
B. NVL2 returns the first non-null expression in the expression list.
C. TRUNCATE rounds the column, expression, or value to n decimal places.
D. DECODE translates an expression after comparing it to each search value.
E. TRIM trims the heading of trailing characters (or both) from a character string.
F. NVL compares two expressions and returns null if they are equal, or the first expression of they are not equal.
G. NULLIF compares twp expressions and returns null if they are equal, or the first expression if they are not equal.
