leetcode

8 Database Problems

9 files changed, 34 insertions(+), 0 deletions(-)

diff --git a/ Problems/0175.sql b/ Problems/0175.sql

@@ -0,0 +1,4 @@

SELECT lastName, city, state

FROM Address

RIGHT JOIN Person

ON Person.personId = Address.personId

diff --git a/ Problems/0181.sql b/ Problems/0181.sql

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

SELECT EmployeeID AS "Employee"

FROM Employee AS E1, Employee AS E2

WHERE E1.managerID = E2.id AND E1.salary > E2.salary

diff --git a/ Problems/0182.sql b/ Problems/0182.sql

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

SELECT P1.email AS "Email"

FROM Person AS P1, Person AS P2

WHERE P1.id > P2.id AND P1.email = P2.email

diff --git a/ Problems/0584.sql b/ Problems/0584.sql

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

SELECT name

FROM Customer

WHERE referee_id IS null OR referee_id != 2

diff --git a/ Problems/0595.sql b/ Problems/0595.sql

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

SELECT name, population, area

FROM World

WHERE area >= 3000000 OR population >= 25000000

diff --git a/ Problems/1148.sql b/ Problems/1148.sql

@@ -0,0 +1,4 @@

SELECT DISTINCT author_id AS 'id'

FROM Views

WHERE author_id = viewer_id

ORDER BY author_id

diff --git a/ Problems/1683.sql b/ Problems/1683.sql

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

SELECT tweet_id

FROM Tweets

WHERE CHAR_LENGTH(content) > 15

diff --git a/ Problems/1757.sql b/ Problems/1757.sql

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

SELECT product_id

FROM Products

WHERE low_fats = 'Y' and recyclable = 'Y'

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

@@ -175,7 +175,10 @@ for solving problems. | 0169 | Easy | [Majority Element](Problems/0169.cpp) | | 0171 | Easy | [Excel Sheet Column Number](Problems/0171.cpp) | | 0173 | Medium | [Binary Search Tree Iterator](Problems/0173.cpp) |

| 0175 | Easy | [Combine Two Tables](Problems/0175.cpp) |

| 0179 | Medium | [Largest Number](Problems/0179.cpp) |

| 0181 | Easy | [Employees Earning More Than Their Managers](Problems/0181.cpp) |

| 0182 | Easy | [Duplicate Emails](Problems/0182.cpp) |

| 0187 | Medium | [Repeated DNA Sequences](Problems/0187.cpp) | | 0189 | Medium | [Rotate Array](Problems/0189.cpp) | | 0190 | Easy | [Reverse Bits](Problems/0190.cpp) |

@@ -349,8 +352,10 @@ for solving problems. | 0567 | Medium | [Permutation in String](Problems/0567.cpp) | | 0572 | Easy | [Subtree of Another Tree](Problems/0572.cpp) | | 0583 | Medium | [Delete Operation for Two Strings](Problems/0583.cpp) |

| 0584 | Easy | [Find Customer Referee](Problems/0584.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) |

| 0605 | Easy | [Can Place Flowers](Problems/0605.cpp) | | 0606 | Easy | [Construct String from Binary Tree ](Problems/0606.cpp) | | 0609 | Medium | [Find Duplicate File in System](Problems/0609.cpp) |

@@ -544,6 +549,7 @@ for solving problems. | 1140 | Medium | [Stone Game II](Problems/1140.cpp) | | 1143 | Medium | [Longest Common Subsequence](Problems/1143.cpp) | | 1146 | Medium | [Snapshot Array](Problems/1146.cpp) |

| 1148 | Easy | [Article Views I](Problems/1148.cpp) |

| 1161 | Medium | [Maximum Level Sum of a Binary Tree](Problems/1161.cpp) | | 1162 | Medium | [As Far from Land as Possible](Problems/1162.cpp) | | 1170 | Medium | [Compare Strings by Frequency of the Smallest Character](Problems/1170.cpp) |

@@ -711,6 +717,7 @@ for solving problems. | 1672 | Easy | [Richest Customer Wealth](Problems/1672.cpp) | | 1675 | Hard | [Minimize Deviation in Array](Problems/1675.cpp) | | 1679 | Medium | [Max Number of K-Sum Pairs](Problems/1679.cpp) |

| 1683 | Easy | [Invalid Tweets](Problems/1683.cpp) |

| 1685 | Medium | [Sum of Absolute Differences in a Sorted Array](Problems/1685.cpp) | | 1689 | Medium | [Partitioning Into Minimum Number Of Deci-Binary Numbers](Problems/1689.cpp) | | 1696 | Medium | [Jump Game VI](Problems/1696.cpp) |

@@ -729,6 +736,7 @@ for solving problems. | 1743 | Medium | [Restore the Array From Adjacent Pairs](Problems/1743.cpp) | | 1751 | Hard | [Maximum Number of Events That Can Be Attended II](Problems/1751.cpp) | | 1753 | Medium | [Maximum Score From Removing Stones](Problems/1753.cpp) |

| 1757 | Easy | [Recyclable and Low Fat Products](Problems/1757.cpp) |

| 1759 | Medium | [Count Number of Homogenous Substrings](Problems/1759.cpp) | | 1760 | Medium | [Minimum Limit of Balls in a Bag](Problems/1760.cpp) | | 1765 | Medium | [Map of Highest Peak](Problems/1765.cpp) |