Update README.md

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GowthamRaj K
2021-07-29 08:16:01 +05:30
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@@ -648,3 +648,9 @@ There are different types of joins available in SQL
# SQL - NULL Values ⛔
- SQL NULL is the term used to represent a missing value.
- A NULL value in a table is a value in a field that appears to be blank.
- A field with a NULL value is a field with no value.
- It is very important to understand that a NULL value is different than a zero value or a field that contains spaces.