How to Perform Data Cleaning and Preprocessing?

Answer Posted / hr@tgksolutions.com

Several steps may be involved in SQL data cleaning and preprocessing:

Use the ROW_NUMBER() window function or the DISTINCT keyword to eliminate duplicates.
Managing missing values: To replace NULL values, use functions such as COALESCE.
Use the CAST or CONVERT functions to fix data types.
Utilize string functions like as LOWER, UPPER, TRIM, and others to standardize formats.

Is This Answer Correct ?    0 Yes 0 No



Post New Answer       View All Answers


Please Help Members By Posting Answers For Below Questions

What is an artificial (derived) primary key? When should it be used?

690


What is second normal form?

728


Explain all codd's rules for relational database system?

744


What are the package used in DBMS ?

2341


Enlist the advantages of normalizing database.

818


What is correlated subquery in dbms?

789


What is system r?

730


What is database in simple language?

715


What is a database in computer?

745


RDBMS file system can be defined as

799


What are the advantages of database system?

746


Define weak entity set.

849


What is the database approach?

686


What is cardinality in db?

735


Explain what are service-specific middleware?

750