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Homework Week #1 PL/SQL Virtual Training: PL/SQL SQL PL/SQL SQL PL/SQL SQL

This document provides instructions and examples for homework assignments on PL/SQL. It includes exercises on identifying PL/SQL as a procedural language, writing PL/SQL blocks with required sections like DECLARE, BEGIN, EXCEPTION, END, and executing simple anonymous blocks to output text. It also provides SQL queries to retrieve country data like national holidays, calculate improved life expectancies, output country names in uppercase, filter languages starting with "f", and display regions with abbreviations including name length.

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277 views3 pages

Homework Week #1 PL/SQL Virtual Training: PL/SQL SQL PL/SQL SQL PL/SQL SQL

This document provides instructions and examples for homework assignments on PL/SQL. It includes exercises on identifying PL/SQL as a procedural language, writing PL/SQL blocks with required sections like DECLARE, BEGIN, EXCEPTION, END, and executing simple anonymous blocks to output text. It also provides SQL queries to retrieve country data like national holidays, calculate improved life expectancies, output country names in uppercase, filter languages starting with "f", and display regions with abbreviations including name length.

Uploaded by

monica_lufo
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOC, PDF, TXT or read online on Scribd
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Homework Week #1

PL/SQL Virtual Training

1. Circle the programming language meeting the criteria

3GL PL/SQL SQL


4GL PL/SQL SQL
Is proprietary to Oracle Corporation PL/SQL SQL
Nonprocedural PL/SQL SQL
Procedural PL/SQL SQL
Is ANSI-compliant PL/SQL SQL

2. In your own words, describe why a procedural language like PL/SQL is needed.

Permite imbinarea instructiunilor logice si de control cu instructiuni SQL.

3. Complete the following chart defining the syntactical requirements for a PL/SQL block:

Optional or Mandatory? What is included in this section?

DECLARE Optional Include variabile, cursori, exceptii


BEGIN - Obligatoriu Instructiuni SQL si PL-SQL
EXCEPTION Optional Actiuni efectuate cand apar erori
END; - Obligatoiu

5. In Application Express:
0 Create and execute a simple anonymous block that outputs your name.
BEGIN
DBMS_OUTPUT.PUT_LINE (Monica Chirita);
END;

B. Create and execute a simple anonymous block that does the following:
0 Declares a variable of datatype DATE and populates it with the date that is six months from
today
1 Outputs In six months, the date will be: <insert date>.
2
DECLARE
v_date DATE;
BEGIN
SELECT ADD_MONTH(Sysdate, 6) INTO v_date FROM DUAL;
DBMS_OUTPUT.PUT_LINE(In six months, the date will be: || v_date);
END;

6. Write a SQL statement that will return data that looks like this:
SELECT country_name COUNTRY,
national_holiday_name ||' is '|| national_holiday_date AS "NATIONAL HOLIDAY"
FROM wf_countries;

7. Due to a successful global health program, the life expectancy at birth will increase by 7 years for
countries whose median ages are below 20. Display the current and increased life expectancy for
these countries in the wf_countries table. Name the calculated column Improved Expectancy.

SELECT country_id, country_name, life_expect_at_birth,


life_expect_at_birth + 7 as "Improved Expectancy"
FROM wf_countries
WHERE median_age < 20;

8. Write a SQL statement that lists the country names in alphabetical order. Display the results in
uppercase and give the column a heading of NAME.

SELECT UPPER(country_name) AS NAME


FROM wf_countries
ORDER BY country_name;

9. Display all the languages in the wf_languages table that start with f. Use the lowercase f in
your SQL statement.
SELECT *
FROM wf_languages
WHERE LOWER(language_name) like 'f%';

10. From the wf_world_regions table, display the ID, name, and an abbreviation that is the first three
characters of the region name.

SELECT region_id, region_name, SUBSTR(region_name,1,3) AS abbreviation


FROM wf_world_regions;

11. Modify your SQL statement so that the abbreviation is the first three characters of the region name
followed by the length of the region name. For example: Western Asia would be Wes12.

SELECT region_id, region_name,


CONCAT(SUBSTR(region_name,1,3), LENGTH(region_name)) AS abbreviation
FROM wf_world_regions;

12. Display all country names from the wf_countries table, along with the life expectancy, rounded to
the nearest whole number.

SELECT country_name, ROUND(life_expect_at_birth, 0)


FROM wf_countries;

13. Write a SQL statement to list country names and capitals. If the capital is null, display it as none
listed.

SELECT country_name, NVL(capital,'none listed')


FROM wf_countries;

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