CodeBlanks Logo Icon CodeBlanks
Login Register

Project design

Set up the table structure of the CRUD app and write skeleton queries.

Project design

In this project you will build the table structure of a simple CRUD app. First step is to create the notes table.

CREATE TABLE notes (
  id INT PRIMARY KEY,
  title VARCHAR(100),
  body TEXT
);

This table has id, title and body columns. id is the primary key.

The table notes is created.

Project design — details

CRUD stands for Create-Read-Update-Delete. You create a table, then insert, read, update and delete data. This lesson sets up the table.

Practice Project design

Create the notes table with id (INT PRIMARY KEY), title (VARCHAR(100)) and body (TEXT).

Starter code

query.sql
-- create the table
CREATE TABLE

Sample solution

query.sql
CREATE TABLE notes (
  id INT PRIMARY KEY,
  title VARCHAR(100),
  body TEXT
)

Expected output

Tablo oluşturuldu

Questions and answers

Review the lesson questions together with their answers. To test yourself, solve the lesson interactively.

1 What does CRUD stand for?

  • Count-Read-Use-Drop
  • Copy-Run-Undo-Draw
  • Create-Read-Update-Delete Correct answer
  • Create-Run-Update-Done

Explanation: CRUD means Create-Read-Update-Delete.

2 Create table

Question 
CREATE ____ notes (id INT PRIMARY KEY, title VARCHAR(100));
Answer 
CREATE TABLE notes (id INT PRIMARY KEY, title VARCHAR(100));

Explanation: A new table is created with CREATE TABLE; columns are defined in the parentheses.

3 Project design: match the terms

Term Meaning
CREATE TABLE create table
INSERT insert
UPDATE update
DELETE delete

All lessons in Beginner

1 SELECT basics

  1. What is SELECT?
  2. Selecting all columns
  3. Selecting specific columns
  4. Column aliases with AS
  5. Literal values
  6. Summary - SELECT basics

2 WHERE filtering

  1. What is WHERE?
  2. Comparison operators
  3. AND and OR
  4. IN and BETWEEN
  5. Pattern matching with LIKE
  6. Summary - WHERE filtering

3 Ordering and limit

  1. ORDER BY
  2. ASC and DESC
  3. Multi-column ordering
  4. LIMIT
  5. OFFSET
  6. Summary - Ordering and limit

4 Project: CRUD app

  1. Project design
  2. Reading data
  3. Inserting data
  4. Updating data
  5. Deleting data

5 Data types

  1. Integer types
  2. Decimal types
  3. CHAR and VARCHAR
  4. DATE and TIME
  5. BOOLEAN
  6. Summary - Data types

6 Operators

  1. Arithmetic operators
  2. Comparison operators
  3. Logical operators
  4. IS NULL
  5. String concatenation
  6. Summary - Operators

7 String functions

  1. UPPER and LOWER
  2. LENGTH
  3. SUBSTRING
  4. TRIM
  5. CONCAT
  6. Summary - String functions

8 Project: Shopping cart

  1. Cart design
  2. Listing products
  3. Adding to cart
  4. Calculating total
  5. Removing from cart

9 Number functions

  1. ROUND
  2. CEIL and FLOOR
  3. ABS
  4. POWER and SQRT
  5. MOD
  6. Summary - Number functions

10 Date functions

  1. CURRENT_DATE and NOW
  2. EXTRACT
  3. Date arithmetic
  4. DATEDIFF
  5. Date formatting
  6. Summary - Date functions

11 NULL handling

  1. What is NULL?
  2. IS NULL
  3. COALESCE
  4. NULLIF
  5. Three-valued logic
  6. Summary - NULL handling

12 DISTINCT

  1. What is DISTINCT?
  2. DISTINCT on one column
  3. Multi-column DISTINCT
  4. DISTINCT with aggregates
  5. DISTINCT vs GROUP BY
  6. Summary - DISTINCT

13 INSERT

  1. INSERT basics
  2. Inserting into specific columns
  3. Multiple rows
  4. INSERT with SELECT
  5. DEFAULT values
  6. Summary - INSERT

14 UPDATE

  1. UPDATE basics
  2. Conditional UPDATE
  3. Multi-column UPDATE
  4. Calculated updates
  5. UPDATE pitfalls
  6. Summary - UPDATE

15 DELETE

  1. DELETE basics
  2. Conditional DELETE
  3. DELETE vs TRUNCATE
  4. Emptying a table
  5. Safe deletion
  6. Summary - DELETE

16 CREATE TABLE

  1. CREATE TABLE basics
  2. Column definitions
  3. NOT NULL
  4. DEFAULT
  5. PRIMARY KEY
  6. Summary - CREATE TABLE

17 Constraints

  1. UNIQUE constraint
  2. CHECK constraint
  3. FOREIGN KEY
  4. CASCADE
  5. Constraint management
  6. Summary - Constraints

18 Simple JOIN

  1. What is JOIN?
  2. INNER JOIN
  3. The ON clause
  4. Table aliases
  5. Multi-table JOIN
  6. Summary - Simple JOIN

19 Project: Inventory system

  1. Inventory design
  2. Product table
  3. Stock movements
  4. Stock report
  5. Low stock alert

20 Beginner final

  1. Customer query
  2. Order report
  3. Data update
  4. Table redesign