Passtcert Oracle Certification 1Z0-071 exam sample questions

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Share some Oracle Database 1Z0-071 exam questions and answers below.
Which two statements are true regarding the GROUP BY clause in a SQL statement? (Choose two.) 
A. You can use column alias in the GROUP BY clause. 
B. Using the WHERE clause after the GROUP BY clause excludes the rows after creating groups. 
C. The GROUP BY clause is mandatory if you are using an aggregate function in the SELECT clause. 
D. Using the WHERE clause before the GROUP BY clause excludes the rows before creating groups. 
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. 
Answer: D,E

Evaluate the following two queries: 
Which statement is true regarding the above two queries? 
A. Performance would improve query 2 only if there are null values in the CUST__CREDIT__LIMIT column. 
B. There would be no change in performance. 
C. Performance would degrade in query 2. 
D. Performance would improve in query 2. 
Answer: B

Which two statements are true regarding multiple-row subqueries? (Choose two.) 
A. They can contain group functions. 
B. They always contain a subquery within a subquery. 
C. They use the < ALL operator to imply less than the maximum. 
D. They can be used to retrieve multiple rows from a single table only. 
E. They should not be used with the NOT IN operator in the main query if NULL is likely to be a part of the result of the subquery. 
Answer: A,E

Which statement is true regarding external tables? 
A. The default REJECT LIMIT for external tables is UNLIMITED. 
B. The data and metadata for an external table are stored outside the database. 
C. ORACLE_LOADER and ORACLE_DATAPUMP have exactly the same functionality when used with an external table. 
D. The CREATE TABLE AS SELECT statement can be used to unload data into regular table in the database from an external table. 
Answer: D

Which statement is true regarding the INTERSECT operator? 
A. It ignores NULL values 
B. The number of columns and data types must be identical for all SELECT statements in the query 
C. The names of columns in all SELECT statements must be identical 
D. Reversing the order of the intersected tables the result 
Answer: B

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