Question entretien chez Wipro : 1. What is constructor in python, is it same name as class? 2. SQL DML and DDL Difference? 3. How is null represented? 4. What is Garbage Collector?

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1. What is constructor in python, is it same name as class? 2. SQL DML and DDL Difference? 3. How is null represented? 4. What is Garbage Collector?