Read this SQL tutorial to learn when to use SELECT, JOIN, subselects and UNION to access multiple tables with a single statement. It’s sometimes difficult to know which SQL syntax to use when ...

Testing, I know there are 4 records I want returned. I am getting 3. The 3 that have optional link information (an entry in the video_links table).

. ├── data/ │ └── employees.sql # SQL script for database creation and data insertion ├── scripts/ │ ├── queries.sql # SQL script with advanced queries │ ├── stored_procedures.sql # SQL script with ...

How to Create a Table From Query Results in Microsoft SQL. If your business uses relational databases to store data, you may have used a SQL SELECT clause to create new tables from query results.

⚙️ Performance & Optimization • Indexes Created: On customer_id, order_id, product_id, payment_id • CTEs Used: Modularized logic for LTV, recent sales, city-level analysis • EXPLAIN ANALYZE: Helped ...