Database - Interview Questions and Answers for 'Hcl' | Search Interview Question

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

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Q1. What are Inner , Outer , Left and Right Joins in SQL ?

Ans. Inner join is the intersection of two tables on the condition defined by the where clause i.e will get records from both tables matched by a column.

Outer join is the union of two tables i.e will get all records from both tables and will put null in the columns where related records are not present.

Left Outer join is the left union of two tables i.e all records from the table on the left and values from the right table for related records else null for the columns from right table.

Right Outer join is the right union of two tables i.e all records from the table on the right and values from the left table for related records else null for the columns from left table.

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Q2. What is database Normalization ?

Database

Ans. https://en.wikipedia.org/wiki/Database_normalization

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Q3. How to Bulk upload the data into Oracle database?

Database

Ans. We can use external table feature of Oracle.

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Q4. differences between drop , delete and truncate

Database

^{This question was recently asked at 'HCL Technologies'.This question is still unanswered. Can you please provide an answer.}

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