Add MS SQL solutions

BigEgg · BigEgg · commit de2acfff24f6 · 2020-09-03T14:31:56.000-07:00
diff --git a/0175-CombineTwoTables.sql b/0175-CombineTwoTables.sql
@@ -0,0 +1,5 @@
+/* Write your T-SQL query statement below */
+SELECT p.FirstName, p.LastName, a.City, a.State
+FROM Person AS p
+LEFT JOIN Address AS a
+    ON p.PersonId = a.PersonId
diff --git a/0511-GamePlayAnalysisI.sql b/0511-GamePlayAnalysisI.sql
@@ -0,0 +1,5 @@
+/* Write your T-SQL query statement below */
+SELECT DISTINCT
+    player_id,
+    MIN(event_date) OVER (PARTITION BY player_id) AS first_login
+FROM Activity
diff --git a/0577-EmployeeBonus.sql b/0577-EmployeeBonus.sql
@@ -0,0 +1,6 @@
+/* Write your T-SQL query statement below */
+SELECT e.name, b.bonus
+FROM Employee AS e
+LEFT JOIN Bonus AS b
+    ON e.empId = b.empId
+WHERE b.bonus IS NULL OR b.bonus < 1000
diff --git a/0584-FindCustomerReferee.sql b/0584-FindCustomerReferee.sql
@@ -0,0 +1,4 @@
+/* Write your T-SQL query statement below */
+SELECT name
+FROM customer
+WHERE referee_id != 2 OR referee_id IS NULL
diff --git a/0586-CustomerPlacingTheLargestNumberOfOrders.sql b/0586-CustomerPlacingTheLargestNumberOfOrders.sql
@@ -0,0 +1,10 @@
+/* Write your T-SQL query statement below */
+SELECT customer_number
+FROM orders
+GROUP BY customer_number
+HAVING COUNT(order_number) = (
+	SELECT TOP 1 COUNT(order_number)
+	FROM orders
+	GROUP BY customer_number
+	ORDER BY COUNT(order_number) DESC
+)
diff --git a/0595-BigCountries.sql b/0595-BigCountries.sql
@@ -0,0 +1,4 @@
+/* Write your T-SQL query statement below */
+SELECT name, population, area
+FROM World
+WHERE population > 25000000 or area > 3000000
diff --git a/0610-TriangleJudgement.sql b/0610-TriangleJudgement.sql
@@ -0,0 +1,8 @@
+/* Write your T-SQL query statement below */
+SELECT
+    *,
+    CASE
+        WHEN x + y > z AND y + z > x AND x + z > y THEN 'Yes'
+        ELSE 'No'
+    END AS triangle
+FROM triangle
diff --git a/0613-ShortestDistanceInALines.sql b/0613-ShortestDistanceInALines.sql
@@ -0,0 +1,5 @@
+/* Write your T-SQL query statement below */
+SELECT MIN(p1.x - p2.x) AS shortest
+FROM point AS p1
+INNER JOIN point AS p2
+    ON p1.x > p2.x
diff --git a/0620-NotBoringMovies.sql b/0620-NotBoringMovies.sql
@@ -0,0 +1,5 @@
+/* Write your T-SQL query statement below */
+SELECT *
+FROM cinema
+WHERE id % 2 = 1 AND description != 'boring'
+ORDER BY rating DESC
diff --git a/0627-SwapSalary.sql b/0627-SwapSalary.sql
@@ -0,0 +1,8 @@
+/* Write your T-SQL query statement below */
+UPDATE salary
+SET sex = (
+    CASE WHEN sex = 'f'
+    THEN 'm'
+    ELSE 'f'
+    end
+)
diff --git a/1050-ActorsAndDirectorsWhoCooperatedAtLeastThreeTimes.sql b/1050-ActorsAndDirectorsWhoCooperatedAtLeastThreeTimes.sql
@@ -0,0 +1,5 @@
+/* Write your T-SQL query statement below */
+SELECT actor_id, director_id
+FROM ActorDirector
+GROUP BY actor_id, director_id
+HAVING COUNT(actor_id) >= 3;
diff --git a/1068-ProductSalesAnalysisI.sql b/1068-ProductSalesAnalysisI.sql
@@ -0,0 +1,5 @@
+/* Write your T-SQL query statement below */
+SELECT p.product_name, s.year, s.price
+FROM Sales AS s
+INNER JOIN Product AS p
+    ON s.product_id = p.product_id
diff --git a/1069-ProductSalesAnalysisII.sql b/1069-ProductSalesAnalysisII.sql
@@ -0,0 +1,4 @@
+/* Write your T-SQL query statement below */
+SELECT s.product_id, SUM(s.quantity) AS total_quantity
+FROM Sales AS s
+GROUP BY s.product_id
diff --git a/1082-SalesAnalysisI.sql b/1082-SalesAnalysisI.sql
@@ -0,0 +1,12 @@
+/* Write your T-SQL query statement below */
+SELECT seller_id
+FROM (
+    SELECT
+        seller_id,
+        rank() OVER (
+            ORDER BY SUM(price) DESC
+        ) AS rank
+    FROM sales
+    GROUP BY seller_id
+) AS b
+WHERE rank = 1
diff --git a/1148-ArticleViewsI.sql b/1148-ArticleViewsI.sql
@@ -0,0 +1,4 @@
+/* Write your T-SQL query statement below */
+SELECT DISTINCT author_id AS id
+FROM Views
+WHERE author_id = viewer_id
diff --git a/1173-ImmediateFoodDeliveryI.sql b/1173-ImmediateFoodDeliveryI.sql
@@ -0,0 +1,17 @@
+/* Write your T-SQL query statement below */
+WITH cte AS (
+    SELECT
+        delivery_id,
+        CASE
+            WHEN order_date = customer_pref_delivery_date
+            Then 1
+            Else 0
+            End
+        AS delivery_status
+    FROM Delivery
+)
+
+SELECT
+    ROUND(SUM(CAST(delivery_status AS FLOAT)) * 100 / Count(delivery_id), 2)
+AS immediate_percentage
+FROM cte
diff --git a/1179-ReformatDepartmentTable.sql b/1179-ReformatDepartmentTable.sql
@@ -0,0 +1,23 @@
+/* Write your T-SQL query statement below */
+SELECT *
+FROM (
+    SELECT revenue, month + '_Revenue' AS m, id
+    FROM DEPARTMENT
+) AS t
+PIVOT (
+    SUM(revenue)
+    FOR m IN (
+        [Jan_Revenue],
+        [Feb_Revenue],
+        [Mar_Revenue],
+        [Apr_Revenue],
+        [May_Revenue],
+        [Jun_Revenue],
+        [Jul_Revenue],
+        [Aug_Revenue],
+        [Sep_Revenue],
+        [Oct_Revenue],
+        [Nov_Revenue],
+        [Dec_Revenue]
+    )
+) AS pivot_table
diff --git a/1211-QueriesQualityAndPercentage.sql b/1211-QueriesQualityAndPercentage.sql
@@ -0,0 +1,11 @@
+/* Write your T-SQL query statement below */
+SELECT
+    query_name,
+    ROUND(AVG(rating * 1.0 / position), 2) AS quality,
+    ROUND(AVG(
+        CASE WHEN rating < 3
+        THEN 100.0
+        ELSE 0.0
+        END), 2) AS poor_query_percentage
+FROM Queries
+GROUP BY query_name
diff --git a/1241-NumberOfCommentsPerPost.sql b/1241-NumberOfCommentsPerPost.sql
@@ -0,0 +1,9 @@
+/* Write your T-SQL query statement below */
+SELECT
+    s1.sub_id AS post_id,
+    ISNULL(COUNT(DISTINCT s2.sub_id), 0) AS number_of_comments
+FROM Submissions AS s1
+LEFT JOIN Submissions AS s2
+    ON s1.sub_id = s2.parent_id
+WHERE s1.parent_id IS NULL
+GROUP BY s1.sub_id
diff --git a/1251-AverageSellingPrice.sql b/1251-AverageSellingPrice.sql
@@ -0,0 +1,14 @@
+/* Write your T-SQL query statement below */
+WITH cte AS (
+    SELECT p.product_id, u.units, p.price * u.units AS total
+    FROM Prices AS p
+    LEFT JOIN UnitsSold AS u
+        ON p.product_id = u.product_id AND
+           u.purchase_date BETWEEN p.start_date AND p.end_date
+)
+
+SELECT
+    product_id,
+    Round((Sum(total) * 1.0 / Sum(units)), 2) AS average_price
+FROM cte
+GROUP BY product_id
diff --git a/1280-StudentsAndExaminations.sql b/1280-StudentsAndExaminations.sql
@@ -0,0 +1,23 @@
+/* Write your T-SQL query statement below */
+SELECT
+    t2.*,
+    COALESCE(t1.attended_exams, 0) AS attended_exams
+FROM (
+    SELECT DISTINCT
+        students.student_id,
+        student_name,
+        subject_name,
+        COUNT(*) OVER (PARTITION BY students.student_id, subject_name) AS attended_exams
+    FROM students
+    LEFT JOIN examinations
+        ON students.student_id = examinations.student_id
+) AS t1
+RIGHT JOIN (
+    SELECT
+        students.student_id,
+        students.student_name,
+        subjects.subject_name
+    FROM students, subjects
+) AS t2
+    ON t1.student_id = t2.student_id and t1.subject_name = t2.subject_name
+ORDER BY student_id, subject_name
diff --git a/1303-FindTheTeamSize.sql b/1303-FindTheTeamSize.sql
@@ -0,0 +1,12 @@
+/* Write your T-SQL query statement below */
+SELECT
+    a.employee_id, b.team_size
+FROM Employee AS a
+INNER JOIN (
+    SELECT
+        team_id,
+        count(employee_id) AS team_size
+    FROM Employee
+    GROUP BY team_id
+) AS b
+    ON a.team_id  = b.team_id
diff --git a/1327-ListTheProductsOrderedInAPeriod.sql b/1327-ListTheProductsOrderedInAPeriod.sql
@@ -0,0 +1,10 @@
+/* Write your T-SQL query statement below */
+SELECT
+    p.product_name AS 'product_name',
+    SUM(o.unit) AS 'unit'
+FROM Orders o
+LEFT OUTER JOIN Products p
+    ON p.product_id = o.product_id
+WHERE month(o.order_date) = 2 AND year(o.order_date) = 2020
+GROUP BY p.product_name
+HAVING SUM(o.unit) >= 100
diff --git a/1350-StudentsWithInvalidDepartments.sql b/1350-StudentsWithInvalidDepartments.sql
@@ -0,0 +1,6 @@
+/* Write your T-SQL query statement below */
+SELECT id, name
+FROM Students
+WHERE department_id NOT IN (
+    SELECT id FROM Departments
+)
diff --git a/1378-ReplaceEmployeeIDWithTheUniqueIdentifier.sql b/1378-ReplaceEmployeeIDWithTheUniqueIdentifier.sql
@@ -0,0 +1,5 @@
+/* Write your T-SQL query statement below */
+SELECT u.unique_id, e.name
+FROM Employees AS e
+LEFT JOIN EmployeeUNI AS u
+    ON e.id = u.id
diff --git a/1407-TopTravellers.sql b/1407-TopTravellers.sql
@@ -0,0 +1,10 @@
+/* Write your T-SQL query statement below */
+SELECT u.name, COALESCE(r.travelled_distance, 0) AS travelled_distance
+FROM Users AS u
+LEFT JOIN (
+    SELECT user_id, SUM(distance) AS travelled_distance
+    FROM Rides
+    GROUP BY user_id
+) AS r
+    ON u.id = r.user_id
+ORDER BY COALESCE(r.travelled_distance, 0) DESC, u.name
diff --git a/1435-CreateASessionBarChart.sql b/1435-CreateASessionBarChart.sql
@@ -0,0 +1,38 @@
+/* Write your T-SQL query statement below */
+WITH cte AS
+(
+    SELECT duration/60 AS mins
+    FROM sessions
+)
+
+SELECT
+    '[0-5>' AS bin,
+    SUM(CASE
+            WHEN mins >= 0 AND mins < 5 THEN 1
+            ELSE 0
+        END) AS total
+FROM cte
+UNION ALL
+SELECT
+    '[5-10>' AS bin,
+    SUM(CASE
+            WHEN mins >= 5 AND mins < 10 THEN 1
+            ELSE 0
+        END) AS total
+FROM cte
+UNION ALL
+SELECT
+    '[10-15>' AS bin,
+    SUM(CASE
+            WHEN mins >= 10 AND mins < 15 THEN 1
+            ELSE 0
+        END) AS total
+FROM cte
+UNION ALL
+SELECT
+    '15 or more' AS bin,
+    SUM(CASE
+            WHEN mins >= 15 THEN 1
+            ELSE 0
+        END) AS total
+FROM cte
diff --git a/README.md b/README.md
