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Choose a SQL course by what you will be able to write and verify after studying it. LinkedIn Learning and Udemy are places to find courses, but platform reputation, video length, and a completion certificate do not establish that an individual course fits your needs. Compare the actual syllabus, examples, prerequisites, and access terms.
Define a task and a database dialect
Write a concrete goal: “Produce a customer report that keeps customers with no matching orders,” or “Use a window function to rank products within a category.” Identify the engine you need, such as PostgreSQL, MySQL, or SQL Server. Shared SQL concepts transfer, but date functions, administration, and some query features differ.
Choose an introductory course if you still need SELECT, joins, grouping, and missing-value behavior. Choose a focused course if you can already write those queries and need a specific skill. A long advanced syllabus can be a distraction when the foundations are not yet usable.
Inspect the course before paying
Look for an explicit database version, setup instructions, downloadable or reproducible data, exercises, solutions, and an explanation of how to check an answer. Preview a lesson that contains a complete query. Does the instructor explain the question and output, or only type syntax?
LinkedIn’s exercise-file guidance says not all courses include exercise files; their inclusion is up to the author. Check the specific course. For Udemy SQL listings, inspect the individual curriculum and available preview material rather than treating every course as the same product. Confirm current price, access, cancellation, and refund conditions on the actual offering; this article does not quote changing prices.
Use a small task to test a learning outcome
This independent exercise uses PostgreSQL and requires no tables or downloads. Count paid orders for every customer, including customers with none. The data is fictional and the grain is one row per order.
WITH customers(customer_id, name) AS (
VALUES (1, 'Ada'), (2, 'Ben'), (3, 'Cy')
), orders(order_id, customer_id, status) AS (
VALUES (101, 1, 'paid'), (102, 1, 'cancelled'), (103, 2, 'paid')
)
SELECT c.customer_id, c.name, COUNT(o.order_id) AS paid_orders
FROM customers AS c
LEFT JOIN orders AS o
ON o.customer_id = c.customer_id AND o.status = 'paid'
GROUP BY c.customer_id, c.name
ORDER BY c.customer_id;
The expected rows are Ada: 1, Ben: 1, and Cy: 0. The paid-status filter belongs in the join condition so a customer without a paid match stays in the result. COUNT(o.order_id) counts matching orders; COUNT(*) would count Cy’s unmatched result row and return 1.
Change Ben’s order to cancelled and predict the result before running it. Then add a second paid order for Ada. A useful course should help you reason through those changes, not merely recognize the original query.
Compare two options with the same checklist
For each course, record dialect/version, prerequisites, hands-on time, data availability, answer explanations, relevant topics, update notes, and current access terms. Mark anything you could not verify as unknown. Do not infer instructor support or automatic grading from a marketing description.
A short course with a complete join exercise may be a better immediate fit than a broad survey that never lets you run SQL. That is a judgment about your current goal, not a permanent ranking of the platforms. Reviews can identify questions to investigate, but they cannot prove what you personally will learn.
Turn study into a repeatable practice loop
After a lesson, solve a similar task without copying, predict the result on a tiny fixture, and test an edge case. Keep an error log with the incorrect assumption and the correction. Revisit a problem later to see whether you can explain it independently.
Use SQLPad exercises or your own synthetic data for additional practice. A certificate records course completion; a reproducible query and an explanation of its behavior provide stronger evidence of the skill itself. Continue to the next topic when you can write, check, and explain the current one.
