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KwickClips Databases and SQL · 40 sec · free

What happens if no column name matches?

Short answer. You get a Cartesian product.

How many times does the common column appear?

Once.

Remember

Same column name needed
Common column shown once

Can SQL join tables with no condition? Yes. Natural join finds the column with the same name in both tables. It matches rows on it. That column appears only once. Two rules. Column names must match. It shows once.

This clip is from the full lesson: Working with Two Tables: Cartesian Product, Equi-join and Natural Join — 7 minutes, with the tables, the quick answers and the whole lesson in text.

Useful for: CBSE Class 10 Information Technology (402), CBSE Class 12 Computer Science (083), CBSE Class 12 Informatics Practices (065), CBSE Class 12 Information Technology (802)

More KwickClips from this lesson

One repeated big table beside two split tables linked by a common column.Why avoid one big table?42 secCartesian product table showing every row paired with every row.How do you get the row count?44 secEqui-join query with a WHERE condition on the common column.What makes a join an equi-join?41 sec
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