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Oracle 1z1-071 Exam Syllabus Topics:

Section	Objectives
Topic 1: Data Manipulation and Schema Objects	- DDL operations 1. CREATE, ALTER, DROP tables and constraints - DML operations 1. INSERT, UPDATE, DELETE, MERGE
Topic 2: Relational Database Concepts	- Tables, rows, columns, and relational model basics - Data types and database objects overview
Topic 3: SQL Functions	- Single-row functions 1. Character, numeric, date functions - Conversion and conditional functions 1. TO_CHAR, TO_NUMBER, CASE expressions
Topic 4: SQL Retrieval	- Joins and set operations 1. UNION, INTERSECT, MINUS 2. INNER, OUTER, CROSS joins - SELECT statements and filtering data 1. WHERE clause and conditions 2. ORDER BY and row limiting
Topic 5: Subqueries and Advanced SQL	- Single-row and multi-row subqueries - Correlated subqueries and nested queries

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Oracle Database SQL 認定 1z1-071 試験問題 (Q225-Q230):

質問 # 225
You must display details of all users whose username contains the string 'ch_'.
Which query generates the required output? (Choose the best answer.)

A. SELECT *FROM usersWHERE user_name LIKE 'ch\_%' ESCAPE '_';
B. SELECT *FROM usersWHERE user_name LIKE '%ch\_%' ESCAPE '\';
C. SELECT *FROM usersWHERE user_name LIKE '%ch_%'ESCAPE'%';
D. SELECT *FROM usersWHERE user_name LIKE '%ch_';

正解：C

質問 # 226
Which three queries execute successfully? (Choose three.)

A. SELECT SYSDATE - 1 - DATE '2019-01-01' FROM DUAL;
B. SELECT SYSDATE / DATE '2019-01-01' - 1 FROM DUAL;
C. SELECT SYSDATE - DATE '2019-01-01' - 1 FROM DUAL;
D. SELECT (SYSDATE - DATE '2019-01-01') / 1 FROM DUAL;
E. SELECT 1 - SYSDATE - DATE '2019-01-01' FROM DUAL;
F. SELECT 1 / SYSDATE - DATE '2019-01-01' FROM DUAL;

正解：A、C、D

質問 # 227
Which two are true about using constraints? (Choose two.)

A. A table can have only one PRIMARY KEYbut may have multiple FOREIGN KEYconstraints.
B. A table can have multiple PRIMARY KEYand multiple FOREIGN KEYconstraints.
C. PRIMARY KEYand FOREIGN KEYconstraints can be specified at the column and at the table level.
D. NOT NULLcan be specified at the column and at the table level.
E. A table can have only one PRIMARY KEYand one FOREIGN KEYconstraint.
F. A FOREIGN KEY column in a child table and the referenced PRIMARY KEYcolumn in the parent table must have the same names.

正解：A、D

解説：
FOREIGN KEY constraint can only point to one table and each table can only have one PRIMARY KEY constraint.
Or you can have multiple FOREIGN KEY constraints on the same column(s) referencing one PRIMARY KEY.
The identified columns must be defined as NOT NULL.
Reference: https://stackoverflow.com/questions/42268886/how-to-have-a-foreign-key-pointing-to-two-primary- keys
https://docs.oracle.com/javadb/10.8.3.0/ref/rrefsqlj13590.html

質問 # 228
View and Exhibit and examine the structure and data in the INVOICE table.

Which two statements are true regarding data type conversion in query expressions? (Choose two.)

A. inv_no BETWEEN '101' AND '110' : uses implicit conversion
B. inv_amt = '0255982' : requires explicit conversion
C. CONCAT(inv_amt, inv_date) : requires explicit conversion
D. inv_date = '15-february-2008' :uses implicit conversion
E. inv_date > '01-02-2008' : uses implicit conversion

正解：A、D

質問 # 229
Which three statements are true regarding the usage of the WITH clause in complex correlated subqueries:
(Choose three.)

A. The query name in the WITH clause is visible to other query blocks in the WITH clause as well as to the main query block
B. If the query block name and the table name are the same, then the table name takes precedence.
C. It can be used only with the SELECT clause.
D. The WITH clause can hold more than one query.

正解：A、C、D

質問 # 230
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