Salesforce Case Study 4: Suppose that in you Salesforce Developer Org there is an custom object table Session_Speaker containing field like Session_Date_c, Id and Session_c. Now you have to create a...

Extracted text: Salesforce Case Study 4: Suppose that in you Salesforce Developer Org there is an custom object table Session_Speaker containing field like Session_Date_c, Id and Session_c. Now you have to create a trigger on creation of that record that rejects multiple booking of the speaker sessions. Develop the code for Apex trigger in Apex programming language.