sql1

sql_1.txt

@@ -0,0 +1,15 @@
+Q1:
+SELECT name, population, area FROM world WHERE area>=3000000 or population>=25000000
+
+Q2:
+CREATE FUNCTION getNthHighestSalary(N INT) RETURNS INT
+
+    RETURN (
+        WITH CTE AS(
+            SELECT *, DENSE_RANK()OVER(ORDER BY Salary DESC) as rankzz from employee
+        )
+        SELECT DISTINCT salary from CTE where rankzz=n
+    );
+
+Q3:
+DELETE p1 from person p1 CROSS JOIN person p2 where p1.email=p2.email and p1.id>p2.id