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Do not use SELECT * . Instead, specify only the columns you need to reduce data transfer and processing time.

To become proficient, you must move beyond basic syntax into more complex procedural and structural concepts: IBM Training | DB2 SQL Training in Singapore Db2 Sql Training

Always place the most restrictive predicates first in your WHERE clause to filter out the maximum number of rows early. Do not use SELECT *

Commands like SELECT , INSERT , UPDATE , and DELETE that allow you to interact with the data itself. Db2 Sql Training