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Tip of the Day
Language: SQL
Expertise: Beginner
Jul 15, 2019

WEBINAR:

On-Demand

Building the Right Environment to Support AI, Machine Learning and Deep Learning


T-SQL Performance Tip: The * Operator

It is best to avoid using the * operator in your queries, use explicit column names instead.

SQL Server scans through all column names and replaces the * operator with all the column names of the tables.

Hannes du Preez
 
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