diff --git a/sql-queries-7/remove-duplicate-row-in-sql/identifying-duplicates.sql b/data-manipulation/remove-duplicates/identifying-duplicates.sql
similarity index 100%
rename from sql-queries-7/remove-duplicate-row-in-sql/identifying-duplicates.sql
rename to data-manipulation/remove-duplicates/identifying-duplicates.sql
diff --git a/sql-queries-7/remove-duplicate-row-in-sql/removing-duplicate-row-without-unique-identifier-setup.sql b/data-manipulation/remove-duplicates/removing-duplicate-row-without-unique-identifier-setup.sql
similarity index 100%
rename from sql-queries-7/remove-duplicate-row-in-sql/removing-duplicate-row-without-unique-identifier-setup.sql
rename to data-manipulation/remove-duplicates/removing-duplicate-row-without-unique-identifier-setup.sql
diff --git a/sql-queries-7/remove-duplicate-row-in-sql/using-internal-ctid.sql b/data-manipulation/remove-duplicates/using-internal-ctid.sql
similarity index 100%
rename from sql-queries-7/remove-duplicate-row-in-sql/using-internal-ctid.sql
rename to data-manipulation/remove-duplicates/using-internal-ctid.sql
diff --git a/sql-queries-7/remove-duplicate-row-in-sql/using-temporary-table.sql b/data-manipulation/remove-duplicates/using-temporary-table.sql
similarity index 100%
rename from sql-queries-7/remove-duplicate-row-in-sql/using-temporary-table.sql
rename to data-manipulation/remove-duplicates/using-temporary-table.sql
diff --git a/sql-queries-7/remove-duplicate-row-in-sql/removing-duplicates-in-postgresql.sql b/sql-queries-7/remove-duplicate-row-in-sql/removing-duplicates-in-postgresql.sql
deleted file mode 100644
index 7332503c..00000000
--- a/sql-queries-7/remove-duplicate-row-in-sql/removing-duplicates-in-postgresql.sql
+++ /dev/null
@@ -1,14 +0,0 @@
-DELETE FROM Registration
-USING (
-    SELECT id
-    FROM (
-        SELECT id,
-            ROW_NUMBER() OVER (
-                PARTITION BY semester, year, course_id, student_id
-                ORDER BY id
-            ) as rn
-        FROM Registration
-    ) t
-    WHERE t.rn > 1
-) duplicate
-WHERE Registration.id = duplicate.id;
\ No newline at end of file
diff --git a/sql-queries-7/remove-duplicate-row-in-sql/removing-duplicates-in-sql-server.sql b/sql-queries-7/remove-duplicate-row-in-sql/removing-duplicates-in-sql-server.sql
deleted file mode 100644
index 048f5827..00000000
--- a/sql-queries-7/remove-duplicate-row-in-sql/removing-duplicates-in-sql-server.sql
+++ /dev/null
@@ -1,10 +0,0 @@
-WITH COUNTED_DUPLICATES AS (
-    SELECT id,
-        ROW_NUMBER() OVER (
-            PARTITION BY semester, year, course_id, student_id
-            ORDER BY id
-        ) AS row_number
-    FROM Registration
-)
-DELETE FROM CTE
-WHERE row_number > 1;
\ No newline at end of file
diff --git a/sql-queries-7/remove-duplicate-row-in-sql/setup.sql b/sql-queries-7/remove-duplicate-row-in-sql/setup.sql
deleted file mode 100644
index f5ee7cb0..00000000
--- a/sql-queries-7/remove-duplicate-row-in-sql/setup.sql
+++ /dev/null
@@ -1,9 +0,0 @@
-INSERT INTO Registration (id, semester, year, course_id, student_id)
-VALUES
-    (100, 'Fall', 2021, 'CS211', 1001),
-    (200, 'Fall', 2021, 'CS211', 1001),
-    (300, 'Spring', 2022, 'CS212', 1007),
-    (400, 'Spring', 2022, 'CS212', 1007),
-    (500, 'Spring', 2022, 'CS213', 1003),
-    (600, 'Spring', 2022, 'CS213', 1003);
-
diff --git a/sql-queries-7/remove-duplicate-row-in-sql/using-groupby-and-count.sql b/sql-queries-7/remove-duplicate-row-in-sql/using-groupby-and-count.sql
deleted file mode 100644
index f2099164..00000000
--- a/sql-queries-7/remove-duplicate-row-in-sql/using-groupby-and-count.sql
+++ /dev/null
@@ -1,4 +0,0 @@
-SELECT semester, year, course_id, student_id, COUNT(*) as count 
-FROM Registration 
-GROUP BY semester, year, course_id, student_id 
-HAVING COUNT(*) > 1;
\ No newline at end of file
diff --git a/sql-queries-7/remove-duplicate-row-in-sql/using-left-join.sql b/sql-queries-7/remove-duplicate-row-in-sql/using-left-join.sql
deleted file mode 100644
index a1f1f1b6..00000000
--- a/sql-queries-7/remove-duplicate-row-in-sql/using-left-join.sql
+++ /dev/null
@@ -1,8 +0,0 @@
-DELETE r1 FROM Registration r1
-INNER JOIN Registration r2
-WHERE
-    r1.semester = r2.semester AND
-    r1.year = r2.year AND
-    r1.course_id = r2.course_id AND
-    r1.student_id = r2.student_id AND
-    r1.id > r2.id;
\ No newline at end of file
diff --git a/sql-queries-7/remove-duplicate-row-in-sql/using-rownumber-with-partitionby.sql b/sql-queries-7/remove-duplicate-row-in-sql/using-rownumber-with-partitionby.sql
deleted file mode 100644
index 893719c3..00000000
--- a/sql-queries-7/remove-duplicate-row-in-sql/using-rownumber-with-partitionby.sql
+++ /dev/null
@@ -1,7 +0,0 @@
-SELECT id, semester, year, course_id, student_id,
-    ROW_NUMBER() OVER (
-        PARTITION BY semester, year, course_id, student_id
-        ORDER BY id
-    ) AS rn
-FROM
-    Registration;
\ No newline at end of file
diff --git a/sql-queries-7/remove-duplicate-row-in-sql/using-subqueries.sql b/sql-queries-7/remove-duplicate-row-in-sql/using-subqueries.sql
deleted file mode 100644
index d218e58a..00000000
--- a/sql-queries-7/remove-duplicate-row-in-sql/using-subqueries.sql
+++ /dev/null
@@ -1,13 +0,0 @@
-DELETE FROM Registration
-WHERE id IN (
-    SELECT id
-    FROM (
-        SELECT id,
-            ROW_NUMBER() OVER (
-                PARTITION BY semester, year, course_id, student_id
-                ORDER BY id
-            ) as rn
-        FROM Registration
-    ) t
-    WHERE t.row_number > 1
-);
\ No newline at end of file