The Understand And Descriptive As Possible.Mak Queries And Execut Our Commands. It Is More Advisable To Use Descriptive Names Than To Use Short Names That Are Not Understood. 2. Use Upper And Lower Case To Distuish Query Elements Although It Is Not Requir Because The Sql Language Is Not Casesensitive Most Data Analysts Use Lowercase For Tables And Columns And Uppercase For The Rest. This Case Sensitivity Makes Queries Easier To Read And Understand. 3. Follow The Order Of Sql Execution It Is Essential To Follow The Order Of Execution Of Sql When Writ Our Queries And Commands.
The Establish Order Of Sql Provides
Better Performance And Avoids Afghanistan WhatsApp Number List Problems. The Sql Execution Order Is 1. Select 2. From 3. Where 4. Group By 5. Hav Filters The Aggregat Data 6. Order By 4. Dont Use Too Many Tables The Organization Of Databases In Tables Makes It Easier To Understand The Data And Its Relationships. However It Is Not Advisable To Use A Large Numr Of One Or Twocolumn Tables Since This Data Can Probably Be Integrat Into Other Tables. Hav Fewer Tables Will Simplify Our Work And Avoid Overload The Database. 5. Dont Create Tables With Too Many Columns Try To Find A Middle Ground. Normaliz Data Is Efficient But Only To The Right Extent. However Creat Extremely Long Tables With Many Columns.
Is Not Recommend Either
It Is Preferable That Our Tables Do Not Reach 20 Columns To Avoid Overload The Database And To Facilitate Data Retrieval And Analysis. 6. Maintain Consistency Between Primary And Foreign Keys In Sql Relationships Between Tables Are Creat Through Keys. Keys Are Fields Enter Into The Relational Table And There Are Many Ways To Name Them. However It Is Italy Whatsapp Number Important That We Are Consistent When Nam The Keys. If Not It Will Be More Complex For Us To Create Relationships. It Is Advisable To Name.
