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Answer Best Practices for Removing Duplicates in PL/SQL Queries
Introduction: As a seasoned PL/SQL tutor registered on UrbanPro.com, I understand the importance of efficiently handling data duplicates in PL/SQL queries. Removing duplicates is a common requirement in database management, and there are several strategies to achieve this in PL/SQL.
Methods for Removing Duplicates:
Using DISTINCT Keyword:
DISTINCT keyword in your SELECT statement.
SELECT DISTINCT column1, column2 FROM your_table; Aggregate Functions:
MIN or MAX along with the GROUP BY clause.SELECT column1, MAX(column2) FROM your_table GROUP BY column1; ROWID or ROWNUM:
ROWID or ROWNUM pseudo-columns to uniquely identify rows.
SELECT * FROM ( SELECT column1, column2, ROW_NUMBER() OVER (PARTITION BY column1 ORDER BY column2) as rnum FROM your_table ) WHERE rnum = 1; Online Coaching for PL/SQL:
For in-depth understanding and hands-on experience in PL/SQL, consider enrolling in specialized training courses. UrbanPro.com offers some of the best online coaching for PL/SQL training, providing a structured learning environment with experienced tutors.
PL/SQL Training Overview:
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Conclusion: Removing duplicates in a PL/SQL query involves selecting distinct values using the DISTINCT keyword, leveraging aggregate functions with the GROUP BY clause, or utilizing pseudo-columns like ROWID or ROWNUM. For a more comprehensive understanding and practical application, consider enrolling in the best online coaching for PL/SQL training available on UrbanPro.com.
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