PostgreSQL Example – How to Change Values

Change Values

Create Table Of Elves

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

Insert Rows Into Elf Table


INSERT INTO elves (name, age, race, alive)
VALUES ('Dallar Woodfoot', 25, 'Elf', 'Yes'),
       ('Cordin Garner', 29, 'Elf', 'Yes'),
       ('Keat Knigh', 24, 'Elf', 'Yes'),
       ('Colbat Nalor', 124, 'Elf', 'Yes')

Update Row Values

- Update the elves table
UPDATE elves
- To set age to the current age plus 1
SET age = age + 1

View Elves Table

- Retrieve all rows from the view Elf
SELECT * FROM elves
name age race alive
Dallar Woodfoot 26 Elf Yes
Cordin Garner 30 Elf Yes
Keat Knigh 25 Elf Yes
Colbat Nalor 125 Elf Yes

 

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.

Data Science Resources: Data Science Recipes and Applied Machine Learning Recipes

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