leetcode

5 Database Problems

6 files changed, 35 insertions(+), 0 deletions(-)

diff --git a/ Problems/0586.sql b/ Problems/0586.sql

@@ -0,0 +1,5 @@

SELECT customer_number

FROM Orders

GROUP BY customer_number

ORDER BY COUNT(*) DESC

LIMIT 1

diff --git a/ Problems/0607.sql b/ Problems/0607.sql

@@ -0,0 +1,8 @@

SELECT P.name

FROM Orders O

JOIN Company C

ON O.com_id = C.com_id AND C.name = 'RED'

RIGHT JOIN SalesPerson P

ON P.sales_id = O.sales_id

WHERE O.sales_id IS NULL

diff --git a/ Problems/1084.sql b/ Problems/1084.sql

@@ -0,0 +1,6 @@

SELECT P.product_id, P.product_name

FROM Product P

LEFT JOIN Sales S

ON P.product_id = S.product_id

GROUP BY P.product_id

HAVING MIN(sale_date) >= '2019-01-01' AND MAX(sale_date) <= '2019-03-31';

diff --git a/ Problems/1407.sql b/ Problems/1407.sql

@@ -0,0 +1,8 @@

SELECT U.name,

IFNULL(SUM(R.distance), 0) AS travelled_distance

FROM Users U

LEFT JOIN Rides R

ON U.id = R.user_id

GROUP BY U.id

ORDER BY SUM(R.distance) DESC,

U.name ASC

diff --git a/ Problems/1873.sql b/ Problems/1873.sql

@@ -0,0 +1,3 @@

SELECT employee_id, IF(employee_id % 2 = 1 AND UPPER(SUBSTR(name, 1, 1)) != 'M', salary, 0) AS bonus

FROM Employees

ORDER BY employee_id

diff --git a/ README.md b/ README.md

@@ -357,12 +357,14 @@ for solving problems. | 0577 | Easy | [Employee Bonus](Problems/0577.cpp) | | 0583 | Medium | [Delete Operation for Two Strings](Problems/0583.cpp) | | 0584 | Easy | [Find Customer Referee](Problems/0584.cpp) |

| 0586 | Easy | [Customer Placing the Largest Number of Orders](Problems/0586.cpp) |

| 0589 | Easy | [N-ary Tree Preorder Traversal](Problems/0589.cpp) | | 0590 | Easy | [N-ary Tree Postorder Traversal](Problems/0590.cpp) | | 0595 | Easy | [Big Countries](Problems/0595.cpp) | | 0596 | Easy | [Classes More Than 5 Students](Problems/0596.cpp) | | 0605 | Easy | [Can Place Flowers](Problems/0605.cpp) | | 0606 | Easy | [Construct String from Binary Tree](Problems/0606.cpp) |

| 0607 | Easy | [Sales Person](Problems/0607.cpp) |

| 0609 | Medium | [Find Duplicate File in System](Problems/0609.cpp) | | 0610 | Easy | [Triangle Judgement](Problems/0610.cpp) | | 0617 | Easy | [Merge Two Binary Trees](Problems/0617.cpp) |

@@ -542,6 +544,7 @@ for solving problems. | 1075 | Easy | [Project Employees I](Problems/1075.cpp) | | 1079 | Medium | [Letter Tile Possibilities](Problems/1079.cpp) | | 1081 | Medium | [Smallest Subsequence of Distinct Characters](Problems/1081.cpp) |

| 1084 | Easy | [Sales Analysis III](Problems/1084.cpp) |

| 1089 | Easy | [Duplicate Zeros](Problems/1089.cpp) | | 1090 | Medium | [Largest Values From Labels](Problems/1090.cpp) | | 1091 | Medium | [Shortest Path in Binary Matrix](Problems/1091.cpp) |

@@ -650,6 +653,7 @@ for solving problems. | 1400 | Medium | [Construct K Palindrome Strings](Problems/1400.cpp) | | 1402 | Hard | [Reducing Dishes](Problems/1402.cpp) | | 1406 | Hard | [Stone Game III](Problems/1406.cpp) |

| 1407 | Easy | [Top Travellers](Problems/1407.cpp) |

| 1409 | Medium | [Queries on a Permutation With Key](Problems/1409.cpp) | | 1414 | Medium | [Find the Minimum Number of Fibonacci Numbers Whose Sum Is K](Problems/1414.cpp) | | 1415 | Medium | [The k-th Lexicographical String of All Happy Strings of Length n](Problems/1415.cpp) |

@@ -804,6 +808,7 @@ for solving problems. | 1860 | Medium | [Incremental Memory Leak](Problems/1860.cpp) | | 1861 | Medium | [Rotating the Box](Problems/1861.cpp) | | 1870 | Medium | [Minimum Speed to Arrive on Time](Problems/1870.cpp) |

| 1873 | Easy | [Calculate Special Bonus](Problems/1873.cpp) |

| 1877 | Medium | [Minimize Maximum Pair Sum in Array](Problems/1877.cpp) | | 1884 | Medium | [Egg Drop With 2 Eggs and N Floors](Problems/1884.cpp) | | 1887 | Medium | [Reduction Operations to Make the Array Elements Equal](Problems/1887.cpp) |