Explain SQL joins with a simple example
The short version: SQL joins refers to operations that combine rows from two tables based on a matching column. A quick example makes it concrete — An inner join of Orders and Customers returns only orders with a matching customer.
How to approach it step by step
Once one example makes sense, the method generalises: choose inner, left, right or full depending on which unmatched rows must survive. In a visual interactive session the example is built on screen piece by piece, so you see which quantity changes at each step instead of only reading a final answer. Ask for a harder variant and the explanation adapts on the spot.
Worked example
An inner join of Orders and Customers returns only orders with a matching customer.
The mistake most learners make
Using an inner join and silently losing rows that have no match.
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