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SQL - PowerPoint PPT Presentation


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SQL. NULL values. SQL: NULLs. Select A 1 , A 2 ,…, A n From R 1 , R 2 , …, R m Where condition. Demo: simple college admissions database College ( cName , state , enrollment ) Student ( sID , sName , GPA , sizeHS ) Apply ( sID , cName , major , decision ). NULL values:

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slide1

SQL

NULL values

slide2

SQL: NULLs

Select A1,A2,…,An

From R1,R2, …,Rm

Where condition

Demo: simple college admissions database

College(cName,state,enrollment)

Student(sID,sName,GPA,sizeHS)

Apply(sID,cName,major,decision)

NULL values:

undefined

or unknown

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