diff --git a/sql-queries-2/sql-retrieve-random/sql-random-mssql.sql b/sql-queries-2/sql-retrieve-random/sql-random-mssql.sql
new file mode 100644
index 00000000..2879278b
--- /dev/null
+++ b/sql-queries-2/sql-retrieve-random/sql-random-mssql.sql
@@ -0,0 +1,3 @@
+SELECT TOP 1 * 
+  FROM Faculty 
+  ORDER BY NEWID();
diff --git a/sql-queries-2/sql-retrieve-random/sql-random-mysql.sql b/sql-queries-2/sql-retrieve-random/sql-random-mysql.sql
new file mode 100644
index 00000000..5183fa62
--- /dev/null
+++ b/sql-queries-2/sql-retrieve-random/sql-random-mysql.sql
@@ -0,0 +1,4 @@
+SELECT * 
+  FROM Faculty 
+  ORDER BY RAND() 
+  LIMIT 1;
diff --git a/sql-queries-2/sql-retrieve-random/sql-random-postgres.sql b/sql-queries-2/sql-retrieve-random/sql-random-postgres.sql
new file mode 100644
index 00000000..5a932541
--- /dev/null
+++ b/sql-queries-2/sql-retrieve-random/sql-random-postgres.sql
@@ -0,0 +1,14 @@
+SELECT * 
+  FROM Faculty 
+  ORDER BY RANDOM() 
+  LIMIT 1;
+
+SELECT * 
+  FROM Faculty 
+  ORDER BY RANDOM() 
+  LIMIT 2;
+
+SELECT * 
+  FROM Faculty 
+  ORDER BY RANDOM() 
+  LIMIT 3;
diff --git a/sql-queries-7/escape-single-quote/escape-quote-mssql.sql b/sql-queries-7/escape-single-quote/escape-quote-mssql.sql
new file mode 100644
index 00000000..e2a4fc64
--- /dev/null
+++ b/sql-queries-7/escape-single-quote/escape-quote-mssql.sql
@@ -0,0 +1,4 @@
+INSERT INTO 
+  Student (id, name, national_id, birth_date, enrollment_date, graduation_date, gpa) 
+  VALUES 
+  (1001, 'John O' || CHR(39) ||'Liu', 123345566, '2001-04-05', '2020-01-15', '2024-06-15', 4);
diff --git a/sql-queries-7/escape-single-quote/escape-quote-pssql.sql b/sql-queries-7/escape-single-quote/escape-quote-pssql.sql
new file mode 100644
index 00000000..01aefafd
--- /dev/null
+++ b/sql-queries-7/escape-single-quote/escape-quote-pssql.sql
@@ -0,0 +1,19 @@
+INSERT INTO 
+  Student (id, name, national_id, birth_date, enrollment_date, graduation_date, gpa) 
+  VALUES
+  (1001, 'John O'Liu', 123345566, '2001-04-05', '2020-01-15', '2024-06-15', 4);
+
+INSERT INTO 
+  Student (id, name, national_id, birth_date, enrollment_date, graduation_date, gpa) 
+  VALUES
+  (1001, 'John O''Liu', 123345566, '2001-04-05', '2020-01-15', '2024-06-15', 4);
+
+INSERT INTO 
+  Student (id, name, national_id, birth_date, enrollment_date, graduation_date, gpa) 
+  VALUES
+  (1001, $$John O'Liu$$, 123345566, '2001-04-05', '2020-01-15', '2024-06-15', 4);
+
+INSERT INTO 
+  Student (id, name, national_id, birth_date, enrollment_date, graduation_date, gpa) 
+  VALUES 
+  (1001, 'John O' || CHR(39) ||'Liu', 123345566, '2001-04-05', '2020-01-15', '2024-06-15', 4);
diff --git a/sql-queries-7/escape-single-quote/escape-single-quote-mysql.sql b/sql-queries-7/escape-single-quote/escape-single-quote-mysql.sql
new file mode 100644
index 00000000..a763aa69
--- /dev/null
+++ b/sql-queries-7/escape-single-quote/escape-single-quote-mysql.sql
@@ -0,0 +1,4 @@
+INSERT INTO 
+  Student (id, name, national_id, birth_date, enrollment_date, graduation_date, gpa) 
+  VALUES 
+  (1001, CONCAT('John O', CHAR(39), 'Liu'), 123345566, '2001-04-05', '2020-01-15', '2024-06-15', 4);