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Adds joins lecture notes.

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Tanmay
2022-07-20 12:50:39 +01:00
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database/notes/05-sql-primer.md
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@@ -185,7 +185,7 @@ SELECT * FROM students WHERE first_name LIKE 'T_';
DELETE FROM students WHERE id IN (1, 2, 3);
```
## Join
## Joins
Join is the widely-used clause in the SQL Server essentially to combine and retrieve data from two or more tables. In a real-world relational database, data is structured in many tables and which is why, there is a constant need to join these multiple tables based on logical relationships between them.