PostgreSQL Example – How to Apply Operation To Column

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Apply Operation To Column

Create Table Of Adventurers

- Create table called adventurers
CREATE TABLE adventurers (
    - string variable
    name varchar(255),
    - integer variable
    age int,
    - string variable
    race varchar(255)
)

Insert Rows

- Insert into the table adventurers
INSERT INTO adventurers (name, age, race)
VALUES ('Fjoak Doom-Wife', 28, 'Human'),
       ('Alooneric Cortte', 29, 'Elf'),
       ('Piperel Ramsay', 35, 'Elf'),
       ('Casimir Yardley', 14, 'Elf')

Apply Operation To Column

- Update the age column, multiplying all age values by 10
UPDATE adventurers SET age = age * 10

Apply Operation To Column With Conditions

- Update the name column where the race column is 'Elf'
UPDATE adventurers SET name = 'Some Elf'
WHERE race = 'Elf'

View Table

- Retrieve data
SELECT * FROM adventurers
name age race
Fjoak Doom-Wife 280 Human
Some Elf 290 Elf
Some Elf 350 Elf
Some Elf 140 Elf

 

 

Python Example for Beginners

Two Machine Learning Fields

There are two sides to machine learning:

  • Practical Machine Learning:This is about querying databases, cleaning data, writing scripts to transform data and gluing algorithm and libraries together and writing custom code to squeeze reliable answers from data to satisfy difficult and ill defined questions. It’s the mess of reality.
  • Theoretical Machine Learning: This is about math and abstraction and idealized scenarios and limits and beauty and informing what is possible. It is a whole lot neater and cleaner and removed from the mess of reality.

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