Question

How to assign values to all the null records in update?​

Answer 1

Answer:

Null Values can be replaced in SQL by using UPDATE, SET, and WHERE to search a column in a table for nulls and replace them. In the example above it replaces them with 0.

Cleaning data is important for analytics because messy data can lead to incorrect analysis. Null values can be a common form of messy data. In aggregation functions they are ignored from the calculation so you need to make sure this is the behavior you are expecting, otherwise you need to replace null values with relevant values.

Answer 2

Answer:

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Explanation: