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Database - Interview Questions and Answers for 'Insert' - 4 question(s) found - Order By Newest

 Q1. If you are given a choice to implement the code to either Insert a Record or Update if already exist, Which approach will you follow ?

1. Insert into the DB Table. If exception occurs, update the existing record.
2. Check if the record exists and update it if it exists, If not insert a new record.
Solution
admin
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Ans. In first case, there would be 2 DB calls in worst case and 1 in best case. In 2nd approach there will be always 2 DB calls.

Decision on the approach should depend on the following considerations -

1. How costly is the call to DB ? Are we using indices , hibernate etc

If calls to DB are costly , 1st approach should be the choice.

2. Exception Book keeping load upon exception.

The benefit of saving 1st call in approach 1 should be bigger than the Book keeping for the exception.

3. Probability of the exception in first apparoach.

If the DB Table is almost empty, it makes sense to follow Approach 1 as majority of the 1st calls will pass through without exception.

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   Like         Discuss         Correct / Improve     database   insert-update   db exceution plan   db strategy   design   architecture   technical lead


 Q2. Do you know of any DB statement that can be used if we would like to insert multiple rows into a table ? Database
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Ans. We can use INSERT ALL.

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   Like         Discuss         Correct / Improve     database   insert   dml statement   sql


 Q3. Create a Table with 2 Columns and Insert a row into itDatabase2017-01-28 14:25:32

Ans. CREATE TABLE TABLE_NAME (
ID NUMBER PRIMARY KEY,
NAME VARCHAR(50) NOT NULL,
);

INSERT INTO TABLE_NAME(ID, NAME) VALUES(1, "Abc");

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   Like         Discuss         Correct / Improve     ddl  dml  create table  insert records into table     Asked in 1 Companies


 Q4. Write a Program for insertion sort.Core Java2017-06-12 07:50:44

 This question was recently asked at 'Ola Cabs'.This question is still unanswered. Can you please provide an answer.


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   Like         Discuss         Correct / Improve     program  code  coding  insertion sort   sort     Asked in 1 Companies



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