Topic 1: Briefly describe these 3 SQL commands explaining what they do and how they differ. DELETE TRUNCATE DROP Which one/s are DML? Which one/s are DDL?
DBMS 130 Worksheet: Data Manipulation Language (DML) and Introduction to
SQL Queries
Topic 1: Briefly describe these 3 SQL commands explaining what they do and how they differ.
DELETE
TRUNCATE
DROP
Which one/s are DML?
Which one/s are DDL?
You may want to try these in APEX.
BUT BE CAREFUL!
If you use them, you WILL LOSE some data and have to repopulate those data.
Topic 2: INSERT
Write INSERT statements to add two countries to HOL_COUNTRIES.
The countries are China and Kenya
Write one INSERT statement with a column list and one without a column list.
INSERT INTO HOL_COUNTRIES (Country_ID, Country_Name)
VALUES
...
INSERT INTO HOL_COUNTRIES
VALUES
...
Topic 3: INSERT and UPDATE
Write an INSERT statement to create a new department named “Data Analysis’.
Write an INSERT statement to create a new Job Title named ‘Data Analyst’ with a Minimum
salary of 5000.00 and a maximum salary of 10000.00.
In one SQL statement, UPDATE all employees who are currently ‘Programmers’.
Change their department to the new Data Analysis Department.
Change their job title to the new Data Analyst Job.
Change their current salary to 7500.00.
Change their manager to Michael Hartstein.
DO NOT modify any employee who is not a programmer.
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