Certificate in SQL

• What a database actually is
• SELECT and FROM
• Picking the columns you need

• WHERE in all its forms
• IN, BETWEEN and LIKE
• NULL and why it trips people up

• Inner joins step by step
• Left joins and missing data
• Joining more than two tables

• COUNT, SUM and AVG
• GROUP BY without the confusion
• HAVING vs WHERE

• Sorting and limiting
• Aliases and readable queries
• Combining results with UNION

• Business questions turned into queries
• Your query portfolio, end to end

You can practise with free databases like SQLite or PostgreSQL, and we walk you through a simple setup. Nothing in the course needs paid software.

The basics are friendlier than most people expect. Queries read almost like English, and because every lesson has you writing them, they stick.

The core of SQL is the same everywhere. We teach standard SQL and flag the small differences you will meet in PostgreSQL, MySQL and others.

Advanced SQL, if you want window functions and complex reporting queries. Or Power BI, if your next step is dashboards. Both build directly on what you learn here.

For life. You pay once, keep lifetime access, and there is no subscription. There is also a 7-day money-back guarantee if it turns out not to fit.