Combining columns

Combining columns merges separate text fields into a single unified value.

About 5–10 minutes · no sign-up needed

Example

Combining Retail Customer Columns

SELECT customer_id,
       first_name || ' ' || last_name AS full_name,
       region || ' - ' || channel AS region_channel
FROM customers

Result:

AS gives a column a friendlier name in the result.

SELECT customer_id,
       first_name || ' ' || last_name AS full_name,
       region || ' - ' || channel AS region_channel

FROM tells SQL which table to pull the data from.

SELECT customer_id,
       first_name || ' ' || last_name AS full_name,
       region || ' - ' || channel AS region_channel
FROM customers;

Try each one in your head first, then open the answer.

1. Using customers, write a query that joins the customer_id and full_name columns with a space between them.

SELECT customer_id || ' ' || full_name FROM customers

2. Using products, write a query that joins the product_id and brand columns with a space between them.

SELECT product_id || ' ' || brand FROM products

3. Using suppliers, write a query that joins the supplier_id and supplier_name columns with a space between them.

SELECT supplier_id || ' ' || supplier_name FROM suppliers

4. Using employees, write a query that joins the employee_id and full_name columns with a space between them.

SELECT CONCAT(employee_id, ' ', full_name) FROM employees

5. Using reviews, write a query that joins the review_id and product_id columns with a space between them.

SELECT review_id || ' ' || product_id FROM reviews

Learn it by doing. This lesson is a short hands-on level on Bampaa: see it work, then build and write it yourself, with instant feedback.

About 5–10 minutes · no sign-up needed