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submitting day 1 (Sql 1 )problems #98

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2 changes: 2 additions & 0 deletions BigCountries.sql
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Original file line number Diff line number Diff line change
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SELECT NAME,POPULATION,AREA FROM WORLD
WHERE AREA>= 3000000 OR POPULATION>=25000000;
3 changes: 3 additions & 0 deletions DeleteDuplicateEmail.sql
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DELETE P1 FROM PERSON P1
CROSS JOIN PERSON P2 WHERE P1.EMAIL = P2.EMAIL and P1.ID >P2.ID
9 changes: 9 additions & 0 deletions NthHighestSalary.sql
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CREATE FUNCTION getNthHighestSalary(N INT) RETURNS INT
BEGIN
Declare m int;
set m = (n-1);
RETURN (
select distinct salary from employee order by salary desc
limit m,1
);
END