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SQL-16: Differentiate Between WHERE Clause and ON Clause in SQL JOIN #20

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May 30, 2024
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SQL-16: Differentiate Between WHERE Clause and ON Clause in SQL JOIN #20

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5 changes: 5 additions & 0 deletions sql-queries/on-vs-where/filter-with-where.sql
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
SELECT Course.id, Course.name, Course.credits, Course.is_active, Department.name, Department.code
FROM Course JOIN Department
ON Course.department_id = Department.id
WHERE Department.name = 'Computer Science';

7 changes: 7 additions & 0 deletions sql-queries/on-vs-where/inner-join-examples.sql
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@@ -0,0 +1,7 @@
SELECT Course.id, Course.name, Course.credits, Course.is_active, Department.name, Department.code
FROM Course JOIN Department
ON Course.department_id = Department.id;

SELECT Course.id, Course.name, Course.credits, Course.is_active, Department.name, Department.code
FROM Course JOIN Department
WHERE Course.department_id = Department.id;
4 changes: 4 additions & 0 deletions sql-queries/on-vs-where/left-join-example.sql
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Original file line number Diff line number Diff line change
@@ -0,0 +1,4 @@
SELECT Course.name, Department.name
FROM Course
LEFT JOIN Department
ON Course.department_id = Department.id;