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Writing Optimal Queries
Things to Consider
• Using Functions in Queries
• Implicit Conversions/Data Type Mismatch
• Missing Join Predicates, Missing Column Statistics
• Clustered GUID’s
• Remember - Row goal issue
Things to Consider contd..
• SQL Anti Patterns
• Temp Table vs Table Variable
• Avoid using HAVING when its possible to use WHERE
• Issues with Multiple Distinct Aggregates.
Introduction
• Sourabh Agarwal
• Premier Field Engineer – Microsoft Services
• Blogs: www.sqluninterrupted.com
• Facebook: www.facebook.comtroubleshootingsql,
www.facebook.comsqlserverfaq,
https://www.facebook.com/groups/SQLBangalore/?ref=bookmarks
• Twitter: @SQLSourabh
Writing optimal queries

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Writing optimal queries

  • 2. Things to Consider • Using Functions in Queries • Implicit Conversions/Data Type Mismatch • Missing Join Predicates, Missing Column Statistics • Clustered GUID’s • Remember - Row goal issue
  • 3. Things to Consider contd.. • SQL Anti Patterns • Temp Table vs Table Variable • Avoid using HAVING when its possible to use WHERE • Issues with Multiple Distinct Aggregates.
  • 4. Introduction • Sourabh Agarwal • Premier Field Engineer – Microsoft Services • Blogs: www.sqluninterrupted.com • Facebook: www.facebook.comtroubleshootingsql, www.facebook.comsqlserverfaq, https://www.facebook.com/groups/SQLBangalore/?ref=bookmarks • Twitter: @SQLSourabh