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move database problems to its own readme.md
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@@ -16,112 +16,7 @@ _If you like this project, please leave me a star._ ★
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## Database
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| # | Title | Solutions | Video | Difficulty | Tag
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|-----|----------------|---------------|---------------|---------------|-------------
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|1757|[Recyclable and Low Fat Products](https://leetcode.com/problems/recyclable-and-low-fat-products/)|[Solution](../master/database/_1757.sql) || Easy |
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|1729|[Find Followers Count](https://leetcode.com/problems/find-followers-count/)|[Solution](../master/database/_1729.sql) || Easy |
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|1709|[Biggest Window Between Visits](https://leetcode.com/problems/biggest-window-between-visits/)|[Solution](../master/database/_1709.sql) || Medium |
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|1693|[Daily Leads and Partners](https://leetcode.com/problems/daily-leads-and-partners/)|[Solution](../master/database/_1693.sql) || Easy |
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|1683|[Invalid Tweets](https://leetcode.com/problems/invalid-tweets/)|[Solution](../master/database/_1683.sql) || Easy |
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|1677|[Product's Worth Over Invoices](https://leetcode.com/problems/products-worth-over-invoices/)|[Solution](../master/database/_1677.sql) || Easy |
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|1667|[Fix Names in a Table](https://leetcode.com/problems/fix-names-in-a-table/)|[Solution](../master/database/_1667.sql) || Easy |
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|1661|[Average Time of Process per Machine](https://leetcode.com/problems/average-time-of-process-per-machine/)|[Solution](../master/database/_1661.sql) || Easy |
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|1633|[Percentage of Users Attended a Contest](https://leetcode.com/problems/percentage-of-users-attended-a-contest/)|[Solution](../master/database/_1633.sql) || Easy |
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|1623|[All Valid Triplets That Can Represent a Country](https://leetcode.com/problems/all-valid-triplets-that-can-represent-a-country/)|[Solution](../master/database/_1623.sql) || Easy |
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|1607|[Sellers With No Sales](https://leetcode.com/problems/sellers-with-no-sales/)|[Solution](../master/database/_1607.sql) || Easy |
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|1596|[The Most Frequently Ordered Products for Each Customer](https://leetcode.com/problems/the-most-frequently-ordered-products-for-each-customer/)|[Solution](../master/database/_1596.sql) || Medium |
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|1571|[Warehouse Manager](https://leetcode.com/problems/warehouse-manager/)|[Solution](../master/database/_1571.sql) || Easy |
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|1587|[Bank Account Summary II](https://leetcode.com/problems/bank-account-summary-ii/)|[Solution](../master/database/_1587.sql) || Easy |
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|1581|[Customer Who Visited but Did Not Make Any Transactions](https://leetcode.com/problems/customer-who-visited-but-did-not-make-any-transactions/)|[Solution](../master/database/_1581.sql) || Easy |
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|1565|[Unique Orders and Customers Per Month](https://leetcode.com/problems/unique-orders-and-customers-per-month/)|[Solution](../master/database/_1565.sql) || Easy |
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|1543|[Fix Product Name Format](https://leetcode.com/problems/fix-product-name-format/)|[Solution](../master/database/_1543.sql) || Easy |
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|1527|[Patients With a Condition](https://leetcode.com/problems/patients-with-a-condition/)|[Solution](../master/database/_1527.sql) || Easy |
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|1517|[Find Users With Valid E-Mails](https://leetcode.com/problems/find-users-with-valid-e-mails/)|[Solution](../master/database/_1517.sql) || Easy |
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|1511|[Customer Order Frequency](https://leetcode.com/problems/customer-order-frequency/)|[Solution](../master/database/_1511.sql) || Easy |
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|1495|[Friendly Movies Streamed Last Month](https://leetcode.com/problems/friendly-movies-streamed-last-month/)|[Solution](../master/database/_1495.sql) || Easy |
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|1435|[Create a Session Bar Chart](https://leetcode.com/problems/create-a-session-bar-chart/)|[Solution](../master/database/_1435.sql) || Easy |
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|1484|[Group Sold Products By The Date](https://leetcode.com/problems/group-sold-products-by-the-date/)|[Solution](../master/database/_1484.sql) || Easy |
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|1445|[Apples & Oranges](https://leetcode.com/problems/apples-oranges/)|[Solution](../master/database/_1445.sql) || Medium |
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|1407|[Top Travellers](https://leetcode.com/problems/top-travellers/)|[Solution](../master/database/_1407.sql) || Easy |
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|1393|[Capital Gain/Loss](https://leetcode.com/problems/capital-gainloss/)|[Solution](../master/database/_1393.sql) || Easy |
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|1384|[Total Sales Amount by Year](https://leetcode.com/problems/total-sales-amount-by-year/)|[Solution](../master/database/_1384.sql) || Hard |
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|1378|[Replace Employee ID With The Unique Identifier](https://leetcode.com/problems/replace-employee-id-with-the-unique-identifier/)|[Solution](../master/database/_1378.sql) || Easy |
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|1371|[The Number of Employees Which Report to Each Employee](https://leetcode.com/problems/the-number-of-employees-which-report-to-each-employee/)|[Solution](../master/database/_1371.sql) || Easy |
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|1369|[Get the Second Most Recent Activity](https://leetcode.com/problems/get-the-second-most-recent-activity/)|[Solution](../master/database/_1369.sql) || Hard |
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|1364|[Number of Trusted Contacts of a Customer](https://leetcode.com/problems/number-of-trusted-contacts-of-a-customer/)|[Solution](../master/database/_1364.sql) || Medium |
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|1355|[Activity Participants](https://leetcode.com/problems/activity-participants/)|[Solution](../master/database/_1355.sql) || Medium |
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|1350|[Students With Invalid Departments](https://leetcode.com/problems/students-with-invalid-departments/)|[Solution](../master/database/_1350.sql) || Easy |
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|1341|[Movie Rating](https://leetcode.com/problems/movie-rating/)|[Solution](../master/database/_1341.sql) || Medium |
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|1327|[List the Products Ordered in a Period](https://leetcode.com/problems/list-the-products-ordered-in-a-period/)|[Solution](../master/database/_1327.sql) || Easy |
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|1322|[Ads Performance](https://leetcode.com/problems/ads-performance/)|[Solution](../master/database/_1322.sql) || Easy |
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|1308|[Running Total for Different Genders](https://leetcode.com/problems/running-total-for-different-genders/)|[Solution](../master/database/_1308.sql) || Medium |
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|1303|[Find the Team Size](https://leetcode.com/problems/find-the-team-size/)|[Solution](../master/database/_1303.sql) || Easy |
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|1294|[Weather Type in Each Country](https://leetcode.com/problems/weather-type-in-each-country/)|[Solution](../master/database/_1294.sql) | | Easy |
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|1285|[Find the Start and End Number of Continuous Ranges](https://leetcode.com/problems/find-the-start-and-end-number-of-continuous-ranges/)|[Solution](../master/database/_1285.sql) || Medium |
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|1280|[Students and Examinations](https://leetcode.com/problems/students-and-examinations/)|[Solution](../master/database/_1280.sql) | [:tv:](https://www.youtube.com/watch?v=ThbkV4Fs7iE)| Easy |
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|1270|[All People Report to the Given Manager](https://leetcode.com/problems/all-people-report-to-the-given-manager/)|[Solution](../master/database/_1270.sql) || Medium |
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|1251|[Average Selling Price](https://leetcode.com/problems/average-selling-price/)|[Solution](../master/database/_1251.sql) | | Easy |
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|1241|[Number of Comments per Post](https://leetcode.com/problems/number-of-comments-per-post/)|[Solution](../master/database/_1241.sql) | | Easy |
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|1211|[Queries Quality and Percentage](https://leetcode.com/problems/queries-quality-and-percentage/)|[Solution](../master/database/_1211.sql) | | Easy |
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|1179|[Reformat Department Table](https://leetcode.com/problems/reformat-department-table/)|[Solution](../master/database/_1179.sql) | | Easy |
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|1173|[Immediate Food Delivery I](https://leetcode.com/problems/immediate-food-delivery-i/)|[Solution](../master/database/_1173.sql) | | Easy |
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|1148|[Article Views I](https://leetcode.com/problems/article-views-i/)|[Solution](../master/database/_1148.sql) | | Easy |
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|1142|[User Activity for the Past 30 Days II](https://leetcode.com/problems/user-activity-for-the-past-30-days-ii/)|[Solution](../master/database/_1142.sql) | | Easy |
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|1141|[User Activity for the Past 30 Days I](https://leetcode.com/problems/user-activity-for-the-past-30-days-i/)|[Solution](../master/database/_1141.sql) | | Easy |
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|1113|[Reported Posts](https://leetcode.com/problems/reported-posts/)|[Solution](../master/database/_1113.sql) | | Easy |
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|1084|[Sales Analysis III](https://leetcode.com/problems/sales-analysis-iii/)|[Solution](../master/database/_1084.sql) | | Easy |
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|1083|[Sales Analysis II](https://leetcode.com/problems/sales-analysis-ii/)|[Solution](../master/database/_1083.sql) | | Easy |
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|1082|[Sales Analysis I](https://leetcode.com/problems/sales-analysis-i/)|[Solution](../master/database/_1082.sql) | | Easy |
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|1076|[Project Employees II](https://leetcode.com/problems/project-employees-ii/)|[Solution](../master/database/_1076.sql) | | Easy |
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|1075|[Project Employees I](https://leetcode.com/problems/project-employees-i/)|[Solution](../master/database/_1075.sql) | | Easy |
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|1069|[Product Sales Analysis II](https://leetcode.com/problems/product-sales-analysis-ii/)|[Solution](../master/database/_1069.sql) | | Easy |
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|1068|[Product Sales Analysis I](https://leetcode.com/problems/product-sales-analysis-i/)|[Solution](../master/database/_1068.sql) | | Easy |
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|1050|[Actors and Directors Who Cooperated At Least Three Times](https://leetcode.com/problems/actors-and-directors-who-cooperated-at-least-three-times/)|[Solution](../master/database/_1050.sql) || Easy |
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|627|[Swap Salary](https://leetcode.com/problems/swap-salary/)|[Solution](../master/database/_627.sql) | | Easy |
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|626|[Exchange Seats](https://leetcode.com/problems/exchange-seats/)|[Solution](../master/database/_626.sql) | | Medium |
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|620|[Not Boring Movies](https://leetcode.com/problems/not-boring-movies/)|[Solution](../master/database/_620.sql) | | Easy |
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|619|[Biggest Single Number](https://leetcode.com/problems/biggest-single-number/)|[Solution](../master/database/_619.sql) | | Easy |
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|618|[Students Report By Geography](https://leetcode.com/problems/students-report-by-geography/)|[Solution](../master/database/_618.sql) | | Hard | Session Variables
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|615|[Average Salary: Departments VS Company](https://leetcode.com/problems/average-salary-departments-vs-company/)|[Solution](../master/database/_615.sql) | | Hard|
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|614|[Second Degree Follower](https://leetcode.com/problems/second-degree-follower/)|[Solution](../master/database/_614.sql) | | Medium | Inner Join
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|613|[Shortest Distance in a Line](https://leetcode.com/problems/shortest-distance-in-a-line/)|[Solution](../master/database/_613.sql) || Easy|
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|612|[Shortest Distance in a Plane](https://leetcode.com/problems/shortest-distance-in-a-plane/)|[Solution](../master/database/_612.sql) || Medium|
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|610|[Triangle Judgement](https://leetcode.com/problems/triangle-judgement/)|[Solution](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/_610.java) | | Easy |
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|608|[Tree Node](https://leetcode.com/problems/tree-node/)|[Solution](../master/database/_608.sql) | | Medium | Union
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|607|[Sales Person](https://leetcode.com/problems/sales-person/)|[Solution](../master/database/_607.sql) | | Easy |
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|603|[Consecutive Available Seats](https://leetcode.com/problems/sales-person/)|[Solution](../master/database/_603.sql) | | Easy |
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|602|[Friend Requests II: Who Has the Most Friends](https://leetcode.com/problems/friend-requests-ii-who-has-the-most-friends/)|[Solution](../master/database/_602.sql) | | Medium |
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|601|[Human Traffic of Stadium](https://leetcode.com/problems/human-traffic-of-stadium/)|[Solution](../master/database/_601.sql) | | Hard |
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|597|[Friend Requests I: Overall Acceptance Rate](https://leetcode.com/problems/friend-requests-i-overall-acceptance-rate/)|[Solution](../master/database/_597.sql) | | Easy |
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|596|[Classes More Than 5 Students](https://leetcode.com/problems/classes-more-than-5-students/)|[Solution](../master/database/_596.sql) || Easy |
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|595|[Big Countries](https://leetcode.com/problems/big-countries/)|[Solution](../master/database/_595.sql) | | Easy |
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|586|[Customer Placing the Largest Number of Orders](https://leetcode.com/problems/customer-placing-the-largest-number-of-orders/)|[Solution](../master/database/_586.sql) | | Easy|
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|585|[Investments in 2016](https://leetcode.com/problems/investments-in-2016/)|[Solution](../master/database/_585.java) || Medium|
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|584|[Find Customer Referee](https://leetcode.com/problems/find-customer-referee/)|[Solution](../master/database/_584.java) || Easy|
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|580|[Count Student Number in Departments](https://leetcode.com/problems/count-student-number-in-departments/)|[Solution](../master/database/_580.sql) | |Medium | Left Join
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|578|[Get Highest Answer Rate Question](https://leetcode.com/problems/get-highest-answer-rate-question/)|[Solution](../master/database/_578.sql) || Medium |
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|577|[Employee Bonus](https://leetcode.com/problems/employee-bonus/)|[Solution](../master/database/_577.sql) || Easy |
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|574|[Winning Candidate](https://leetcode.com/problems/winning-candidate/)|[Solution](../master/database/_574.sql) || Medium |
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|571|[Find Median Given Frequency of Numbers](https://leetcode.com/problems/find-median-given-frequency-of-numbers/)|[Solution](../master/database/_571.sql) || Hard |
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|570|[Managers with at Least 5 Direct Reports](https://leetcode.com/problems/managers-with-at-least-5-direct-reports/)|[Solution](../master/database/_570.sql) || Medium |
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|569|[Median Employee Salary](https://leetcode.com/problems/median-employee-salary/)|[Solution](../master/database/_569.sql) || Hard |
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|534|[Game Play Analysis III](https://leetcode.com/problems/game-play-analysis-iii/)|[Solution](../master/database/_534.sql)|| Easy|
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|512|[Game Play Analysis II](https://leetcode.com/problems/game-play-analysis-ii/)|[Solution](../master/database/_512.sql)|| Easy|
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|511|[Game Play Analysis I](https://leetcode.com/problems/game-play-analysis-i/)|[Solution](../master/database/_511.sql)|| Easy|
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|262|[Trips and Users](https://leetcode.com/problems/trips-and-users/)|[Solution](../master/database/_262.sql)||Hard| Inner Join
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|197|[Rising Temperature](https://leetcode.com/problems/rising-temperature/)|[Solution](../master/database/_197.sql)| | Easy|
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|196|[Delete Duplicate Emails](https://leetcode.com/problems/delete-duplicate-emails/)|[Solution](../master/database/_196.sql)| |Easy|
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|185|[Department Top Three Salaries](https://leetcode.com/problems/department-top-three-salaries)|[Solution](../master/database/_185.sql)| | Hard|
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|184|[Department Highest Salary](https://leetcode.com/problems/department-highest-salary)|[Solution](../master/database/_184.sql)| | Medium|
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|183|[Customers Who Never Order](https://leetcode.com/problems/customers-who-never-order/)|[Solution](../master/database/_183.sql)| | Easy|
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|182|[Duplicate Emails](https://leetcode.com/problems/duplicate-emails/)|[Solution](../master/database/_182.sql)| | Easy|
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|181|[Employees Earning More Than Their Managers](https://leetcode.com/problems/employees-earning-more-than-their-managers/)|[Solution](../master/database/_181.sql)| | Easy|
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|180|[Consecutive Numbers](https://leetcode.com/problems/consecutive-numbers)|[Solution](../master/database/_180.sql)| | Medium|
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|178|[Rank Scores](https://leetcode.com/problems/rank-scores/)|[Solution](../master/database/_178.sql)| | Medium|
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|177|[Nth Highest Salary](https://leetcode.com/problems/nth-highest-salary/)|[Solution](../master/database/_177.sql)| | Medium|
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|176|[Second Highest Salary](https://leetcode.com/problems/second-highest-salary/)|[Solution](../master/database/_176.sql)| | Easy|
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|175|[Combine Two Tables](https://leetcode.com/problems/combine-two-tables/)|[Solution](../master/database/_175.sql)| | Easy|
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[All database problems](https://github.com/fishercoder1534/Leetcode/tree/master/paginated_contents/database)
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## Shell

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