sbgowtham · robinjose24 · Dec 25, 2025 · Dec 25, 2025 · Dec 26, 2025 · Dec 26, 2025
diff --git a/10.Key_Constraint_types → 10.Key_Constraint_types.sql b/10.Key_Constraint_types → 10.Key_Constraint_types.sql
@@ -76,6 +76,7 @@ The email column can have one or more NULL values, but each non-NULL email must
 ---
 
  3. NOT NULL Constraint Failure
+    ============================
 
 The NOT NULL constraint ensures that a column cannot contain NULL values. If you try to insert a NULL value into a NOT NULL column, the operation will fail.
 

diff --git a/13.superkey_candidate_key → 13.superkey_candidate_key.sql b/13.superkey_candidate_key → 13.superkey_candidate_key.sql
diff --git a/14.1.case_when → 14.1.case_when_.sql b/14.1.case_when → 14.1.case_when_.sql
diff --git a/...regation , NOT IN , AND , OR , IN , ALAIS → ...tion , NOT IN , AND , OR , IN , ALAIS.sql b/...regation , NOT IN , AND , OR , IN , ALAIS → ...tion , NOT IN , AND , OR , IN , ALAIS.sql
diff --git a/15.null handling → 15.null handling.sql b/15.null handling → 15.null handling.sql
diff --git a/16.String Handling → 16.String Handling.sql b/16.String Handling → 16.String Handling.sql
diff --git a/17.Subquery → 17.Subquery.sql b/17.Subquery → 17.Subquery.sql
diff --git a/18.views → 18.views.sql b/18.views → 18.views.sql
diff --git a/20.Window Function → 20.Window Function.sql b/20.Window Function → 20.Window Function.sql
diff --git a/20.joins → 20.joins.sql b/20.joins → 20.joins.sql
diff --git a/21.union_union_all → 21.union_union_all.sql b/21.union_union_all → 21.union_union_all.sql
diff --git a/22.index_explain → 22.index_explain.sql b/22.index_explain → 22.index_explain.sql
diff --git a/23.partition → 23.partition.sql b/23.partition → 23.partition.sql
diff --git a/...nds CRUD Create, Read, Update, and Delete → ...CRUD Create, Read, Update, and Delete.sql b/...nds CRUD Create, Read, Update, and Delete → ...CRUD Create, Read, Update, and Delete.sql
@@ -1,4 +1,4 @@
-
+✅ Done 
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diff --git a/7.types_of_create_table → 7.types_of_create_table.sql b/7.types_of_create_table → 7.types_of_create_table.sql
@@ -1,9 +1,9 @@
+ ✅ Done 
 My complete SQL Masterclass Notes in Tanglish is now live! Covers 30+ topics with syntax, examples, and step-by-step explanations. 
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 ====================================================================================
 
-
 -- 1) Basic create
 CREATE TABLE employees (
     employee_id INT PRIMARY KEY,
@@ -20,7 +20,7 @@ CREATE TABLE departments (
     location  VARCHAR(100) NOT NULL
 );
 
--- 3) Create table as select
+-- 3) Create table as select ---(CTAS)
 CREATE TABLE high_paid_employees AS
 SELECT 
     employee_id, 

diff --git a/8.alter → 8.alter.sql b/8.alter → 8.alter.sql
diff --git a/9.where → 9.where.sql b/9.where → 9.where.sql
@@ -1,3 +1,4 @@
+✅ Done 
 My complete SQL Masterclass Notes in Tanglish is now live! Covers 30+ topics with syntax, examples, and step-by-step explanations. 
 Perfect for both beginners and professionals to master SQL easily. Check it out here 👉 https://topmate.io/dataengineering/1697791
-Original file line number
+Diff line change
@@ Expand Up @@
     ---
 . NOT NULL Constraint Failure
+        ============================
     The NOT NULL constraint ensures that a column cannot contain NULL values. If you try to insert a NULL value into a NOT NULL column, the operation will fail.
@@ Expand Down @@