Filtering Rows with WHERE
Explore how to filter database rows using the WHERE clause in SQL. Learn to apply comparison operators and combine multiple conditions with AND and OR to retrieve targeted data. This lesson helps you write logic-based queries to select only relevant information from tables like employees, enhancing data analysis precision.
Step 1: Start with a question
In Module 1, your queries returned everything. Now let’s get selective. Imagine you work with a table called employees. You might ask:
Write an SQL query to show which employees work in the Engineering department.
This time, you don’t want the entire table, just the rows that meet a specific condition.
Write a SQL query that shows the first name, last name, and department of employees who work in the Engineering department.
Step 2: Run and observe
AI might return:
Run it. Notice how you’re now ...