Questions d'entretiens - Database developer

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On a demandé à un Database Developer...21 février 2013

How do java deal with hash collision?

4 réponses

link them

There's quite an extended back and forth in actual interviews for questions like this, so there's no real replacement for actual practice. The Prepfully Comscore Database Developer experts have actually worked in this role, so they're able to do a propermock, which really puts you through the paces and lets you assess your readiness level. prepfully.com/practice-interviews Moins

By chaining

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Charles Schwab

Do you need sponsorship for this position?

4 réponses
CMSS Private Limited

1.find second max salary hint using count

4 réponses

SELECT max(salary) FROM emptable WHERE salary < (SELECT max(salary) FROM emptable); Moins

SELECT max(salary) FROM emptable WHERE salary < (SELECT max(salary) FROM emptable); Moins

select max(Emp_Sal) from Employee a where 1 = ( select count(*) from Employee b where b.Emp_Sal > a.Emp_Sal) Moins

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MetricStream

Remove duplicates from table

2 réponses

Using Rowid or Having clause

hdfs dfs -rm /table/duplicates

Texas Association of Community Health Centers

How much SQL do you know.

2 réponses

Tons, over 25 years.

I answered that I used SQL for adding database data for programming a site.

Bryant Christie

They gave me a sheet of queries to write and tasks to complete in a sample database that they had built including a few "if you have time" questions, and left me to do that on my own for about a half hour before reviewing what I had done.

2 réponses

I got through all of the basic questions with close attention to detail, but did not get to the extra questions. Moins

Nice that you posted great info on the position and interview, but wondering what the starting salary was? Moins

Chegus Infotech

Tell about OOPS concepts in java

2 réponses

Explained all the OOPS concepts with example 1) Abstraction 2) Encapsulation 3) Inheritance 4) Polymorphism Moins

They are Abstraction, Encapsulation, Inheritance, and Polymorphism. is key to understanding how Java works. Moins

KLAS Research

Do you understand database normalization?

2 réponses

Honestly

No

AIR Worldwide

Table with a single field with integer value. Write a query to display the field in both ascending and descending order.

2 réponses

Customerid is one of the integer values

Select * from customers Order by customerid; Similarly, Select*from customers Order by customerid desc; Moins

Zeta Global

How would you deal with a developer who writes bad code?

2 réponses

I personally would offer advice and point at similar solutions. I would not be confrontational and sort it out at release time if it was really bad. Perhaps I might want to inform my manager but this is down to level of competence. Nobody is ever wrong in my book, it all boils down to experience. Moins

Tell them "You see all those tasks we have outsourced to India? Do you want yours to be as well? Write better code" Writing readable code is essential, writing efficient code even more so. If a developer cannot do that properly, they need a good scare. Moins

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