Update README.md

2026-04-30 22:13:56 +07:00 · 2021-07-27 19:22:36 +05:30
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@@ -153,4 +153,4 @@ These components are −
 - It is very important to understand that a NULL value is different than a zero value or a field that contains spaces. 
 - A field with a NULL value is the one that has been left blank during a record creation.

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+# SQL Constraints 🚩