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Oracle Database 10g Administrator
Oracle Training Determine which flashback technology to use for each recovery situation
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? (Choose two.)
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;
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Answer: B, D
Explanation:
These statements provide correct syntax and semantics to show the number of customers. Function COUNT()
can be used with substitution symbol of all columns "*" or just with one column name. Last query will be
processed a little bit faster.
Incorrect Answers
A: There is no TOTAL() function in Oracle.
C: There is no TOTAL() function in Oracle.
E: You cannot table name as a parameter of COUNT() function.
F: There is no TOTAL() function in Oracle.
OCP Introduction to Oracle 9i: SQL Exam Guide, Jason Couchman, p. 123-125
Chapter 3: Advanced Data Selection in Oracle