Creating tables via dashboard in Supabase - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a new table named 'customers' in Supabase dashboard.

Supabase

CREATE TABLE [1] (id SERIAL PRIMARY KEY, name TEXT);

Drag options to blanks, or click blank then click option'

Acustomers

Borders

Cproducts

Dsales

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different table name than 'customers'.

Confusing table names with column names.

The table name should be 'customers' as specified in the instruction.

2fill in blank

medium

Complete the code to add a column for storing email addresses as text.

Supabase

ALTER TABLE customers ADD COLUMN [1] TEXT;

Drag options to blanks, or click blank then click option'

Aaddress

Bphone

Cemail

Dage

Attempts:

3 left

💡 Hint

Common Mistakes

Using unrelated column names like 'phone' or 'age'.

Forgetting to specify the data type.

The column to store email addresses should be named 'email'.

3fill in blank

hard

Fix the error in the code to create a table with a primary key.

Supabase

CREATE TABLE orders (order_id [1] PRIMARY KEY, order_date DATE);

Drag options to blanks, or click blank then click option'

ATEXT

BINTEGER

CVARCHAR

DSERIAL

Attempts:

3 left

💡 Hint

Common Mistakes

Using TEXT or VARCHAR for primary keys without auto-increment.

Using INTEGER without auto-increment.

The 'SERIAL' type automatically creates an auto-incrementing integer suitable for primary keys.

4fill in blank

hard

Fill both blanks to create a table 'products' with an integer primary key and a text column 'product_name'.

Supabase

CREATE TABLE products (product_id [1] PRIMARY KEY, [2] TEXT);

Drag options to blanks, or click blank then click option'

ASERIAL

Bproduct_name

Cname

DINTEGER

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'INTEGER' without auto-increment for primary key.

Using wrong column name for product name.

'product_id' should be 'SERIAL' for auto-increment primary key, and the text column should be named 'product_name'.

5fill in blank

hard

Fill all three blanks to create a table 'employees' with an auto-increment primary key, a text column 'first_name', and a date column 'hire_date'.

Supabase

CREATE TABLE employees (employee_id [1] PRIMARY KEY, [2] TEXT, [3] DATE);

Drag options to blanks, or click blank then click option'

ASERIAL

Bfirst_name

Chire_date

DINTEGER

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'INTEGER' instead of 'SERIAL' for primary key.

Mixing up column names or data types.

'employee_id' uses 'SERIAL' for auto-increment primary key, 'first_name' is the text column, and 'hire_date' is the date column.

Practice

1. What is the main purpose of creating tables via the Supabase dashboard?

easy

A. To deploy applications directly from the dashboard

B. To write complex SQL queries manually

C. To create user interface designs

D. To organize data with clear columns and constraints without coding

Solution

1. Step 1: Understand the dashboard's role

   The Supabase dashboard allows users to create tables visually without writing code.

2. Step 2: Identify the main benefit

   This method helps organize data clearly with columns and constraints easily set up.

3. Final Answer:

   To organize data with clear columns and constraints without coding -> Option D

4. Quick Check:

   Dashboard table creation = Organize data visually [OK]

Hint: Dashboard tables = visual data organization, no code needed [OK]

Common Mistakes:

• Confusing dashboard with SQL query writing
• Thinking dashboard creates app UI
• Assuming dashboard deploys apps

2. Which step is required to add a new column when creating a table in the Supabase dashboard?

easy

A. Run a database migration script

B. Write a SQL INSERT statement

C. Click 'Add Column' and define the column name and type

D. Upload a CSV file with column data

Solution

1. Step 1: Locate the column addition feature

   In the Supabase dashboard, you add columns by clicking the 'Add Column' button.

2. Step 2: Define column details

   After clicking, you specify the column name and data type to create it.

3. Final Answer:

   Click 'Add Column' and define the column name and type -> Option C

4. Quick Check:

   Add column = Click button + define name/type [OK]

Hint: Add columns by clicking 'Add Column' and setting details [OK]

Common Mistakes:

• Confusing column addition with data insertion
• Trying to upload data instead of defining structure
• Running scripts instead of using dashboard UI

3. After creating a table with columns id (integer, primary key) and name (text) via the Supabase dashboard, what will be the result of inserting {id: 1, name: 'Alice'} and then querying all rows?

medium

A. [{id: 1, name: 'Alice'}]

B. Error: Missing table schema

C. Empty result set

D. [{name: 'Alice'}]

Solution

1. Step 1: Understand table schema and insert

   The table has columns 'id' as primary key and 'name' as text. Inserting {id:1, name:'Alice'} matches schema.

2. Step 2: Query all rows after insert

   Querying all rows returns the inserted row as [{id: 1, name: 'Alice'}].

3. Final Answer:

   [{id: 1, name: 'Alice'}] -> Option A

4. Quick Check:

   Insert + query = inserted row returned [OK]

Hint: Insert matching schema, query returns inserted rows [OK]

Common Mistakes:

• Expecting error without schema mismatch
• Thinking query returns empty before insert
• Assuming partial row returned without id

4. You tried to create a table via the Supabase dashboard but received an error saying the column name is invalid. What is the most likely cause?

medium

A. Not selecting a data type for the column

B. Using spaces or special characters in the column name

C. Adding too many columns at once

D. Not clicking the 'Save' button after creation

Solution

1. Step 1: Identify invalid column name causes

   Column names cannot contain spaces or special characters in Supabase.

2. Step 2: Recognize common naming rules

   Valid names use letters, numbers, and underscores only.

3. Final Answer:

   Using spaces or special characters in the column name -> Option B

4. Quick Check:

   Invalid column name = spaces/special chars [OK]

Hint: Use only letters, numbers, underscores in column names [OK]

Common Mistakes:

• Ignoring naming rules and using spaces
• Forgetting to select data type (usually warned separately)
• Assuming too many columns cause naming errors

5. You want to create a table for customer orders with columns: order_id (primary key), customer_id, order_date, and total_amount. Which approach via the Supabase dashboard ensures data integrity and efficient queries?

hard

A. Set order_id as primary key, customer_id as foreign key, and choose appropriate data types

B. Create all columns as text type for flexibility

C. Skip primary key to allow duplicate orders

D. Add only order_id and total_amount columns

Solution

1. Step 1: Define primary key for uniqueness

   Setting order_id as primary key ensures each order is unique.

2. Step 2: Use foreign key and proper data types

   Defining customer_id as foreign key links orders to customers; choosing correct data types improves query efficiency.

3. Final Answer:

   Set order_id as primary key, customer_id as foreign key, and choose appropriate data types -> Option A

4. Quick Check:

   Primary + foreign keys + data types = data integrity [OK]

Hint: Use keys and correct types for integrity and speed [OK]

Common Mistakes:

• Using text for all columns losing type benefits
• Skipping primary key causing duplicates
• Ignoring foreign key relationships