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SQL Basics
1. SQL Basics
2. Intermediate SQL
Databases
Select an entire table
Practice 1
Practice 2
Select columns
Practice 1
Practice 2
Practice 3
Filter using WHERE
Practice 1
Practice 2
Practice 3
Practice 4
AND, OR, NOT
BETWEEN
Practice 1
LIKE
Practice 1
Practice 2
WHERE with parentheses
Practice 1
Practice 2
Practice 3
LIMIT
Practice 1
Sort using ORDER BY
Practice 1
Practice 2
Show all customers whose first names contain the letter 'a' twice or more
Clear
Submit
Expected Output
first_name