What is the difference between inner join, left join, right join, and full join in SQL?
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In SQL, joins are used to combine rows from two or more tables based on a related column. Here's the difference between INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN:
1. INNER JOIN
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Returns only the rows where there is a match in both tables.
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Rows without matches are excluded.
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✅ Most commonly used join.
2. LEFT JOIN (or LEFT OUTER JOIN)
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Returns all rows from the left table (A) and the matching rows from the right table (B).
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If no match in B, the result will contain NULLs for B's columns.
➡️ Result: All rows from A, with B’s data where available
3. RIGHT JOIN (or RIGHT OUTER JOIN)
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Opposite of LEFT JOIN.
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Returns all rows from the right table (B) and the matching rows from the left table (A).
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If no match in A, returns NULLs for A's columns.
➡️ Result: All rows from B, with A’s data where available
4. FULL JOIN (or FULL OUTER JOIN)
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Returns all rows from both tables, with matches where possible.
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Non-matching rows will have NULLs for the table without a match.
Each join serves a different purpose depending on what data you need to retrieve.
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Very clear explanation of SQL joins! Understanding the difference between inner, left, right, and full joins is crucial for handling relational databases effectively. Anyone aiming to boost database and query handling skills can benefit from enrolling in an online software testing course , where SQL is often a key part of the curriculum.
ReplyDeleteVery clear explanation of SQL joins! Understanding the difference between inner, left, right, and full joins is crucial for working with relational databases. Learners can master these concepts effectively through online training IT courses with certificate in Hyderabad , which offer practical exercises and real-time examples.
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