Q1. What is the difference between DELETE, TRUNCATE and DROP?
These three remove data at very different levels. `DELETE FROM t WHERE ...` is DML. It removes selected rows, fires triggers, is fully logged, can be rolled back within a...
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Q2. What is a dead-letter queue and when should you use one?
A dead-letter queue (DLQ) is a separate queue that receives messages a consumer cannot process after exhausting retries. It prevents one poison message from blocking a pa...
Q3. How does self work, and what is the difference between class and instance methods?
`self` is the current object. Inside an instance method it is the receiver, inside a class body it is the class, and inside a class method it is the class as well. ```rub...
Q4. Compare the scope functions let, run, with, apply and also.
All five run a block with an object in context. They differ in how the object is referenced (`it` or `this`) and what they return (the object or the lambda result). - `le...