ISGN Corporation interview questions

1st round->25 questions(ISTQB multiple choice questions and few quants) 2nd telephonic round 1)Self intro 2)Smoke & Sanity difference 3)Agile methodology and waterfall methodology difference 4)SDLC & STLC 5)Rate youself out of 5 for SQL knowledge(as i mentioned in my resume regarding MySQL knowledge) 6)Query on update 7)Given 2 tables and need to join with specified column name(table 1:empno and empname,table2:empsal & empname) 8)Severity and Priority 9)Example for high severity and low priority Went call for about 17min 3rd round 1)Mostly on my project 2)Why we do regression testing? 3)What kind of testing intially you do? 4)How will you prepare test cases? 5)What tools did you work? 6)Do you know automation?