Passtcert Oracle Database 12c SQL 1Z0-071 exam sample questions

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Share some Oracle Database 1Z0-071 exam questions and answers below.
Which statements are true? (Choose all that apply.) 
A. The data dictionary is created and maintained by the database administrator. 
B. The data dictionary views can consist of joins of dictionary base tables and user-defined tables. 
C. The usernames of all the users including the database administrators are stored in the data dictionary. 
D. The USER_CONS_COLUMNS view should be queried to find the names of the columns to which a constraint applies. 
E. Both USER_OBJECTS and CAT views provide the same information about all the objects that are owned by the user. 
F. Views with the same name but different prefixes, such as DBA, ALL and USER, use the same base tables from the data dictionary 
Answer: C,D,F

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

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 two statements are true regarding the COUNT function? (Choose two.) 
A. COUNT(*) returns the number of rows including duplicate rows and rows containing NULL value in any of the columns 
B. COUNT(cust_id) returns the number of rows including rows with duplicate customer IDs and NULL value in the CUST_ID column 
C. COUNT(DISTINCT inv_amt) returns the number of rows excluding rows containing duplicates and NULL values in the INV_AMT column 
D. A SELECT statement using COUNT function with a DISTINCT keyword cannot have a WHERE clause 
E. The COUNT function can be used only for CHAR, VARCHAR2 and NUMBER data types 
Answer: A,C

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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