feat: add sql solutions to lc problems: No.0627,1661,1677 (#1108)

* No.0627.Swap Salary
* No.1661.Average Time of Process per Machine
* No.1677.Product's Worth Over Invoices

Author: yanglbme

.prettierignore

@@ -14,6 +14,7 @@ node_modules/
 /solution/bash_problem_readme_template.md
 /solution/bash_problem_readme_template_en.md
 /solution/0100-0199/0177.Nth Highest Salary/Solution.sql
+/solution/0600-0699/0627.Swap Salary/Solution.sql
 /solution/1000-1099/1076.Project Employees II/Solution.sql
 /solution/1000-1099/1082.Sales Analysis I/Solution.sql
 /solution/1100-1199/1173.Immediate Food Delivery I/Solution.sql

solution/0600-0699/0627.Swap Salary/README.md

@@ -78,4 +78,10 @@ SET sex = CASE sex
 END;
 ```
 
+```sql
+# Write your MySQL query statement below
+UPDATE Salary
+SET sex = if(sex = 'f', 'm', 'f');
+```
+
 <!-- tabs:end -->

solution/0600-0699/0627.Swap Salary/README_EN.md

@@ -70,4 +70,10 @@ SET sex = CASE sex
 END;
 ```
 
+```sql
+# Write your MySQL query statement below
+UPDATE Salary
+SET sex = if(sex = 'f', 'm', 'f');
+```
+
 <!-- tabs:end -->

solution/0600-0699/0627.Swap Salary/Solution.sql

@@ -1,5 +1,3 @@
-UPDATE salary
-SET sex = CASE sex
-    WHEN 'm' THEN 'f'
-    ELSE 'm'
-END;
+# Write your MySQL query statement below
+UPDATE Salary
+SET sex = if(sex = 'f', 'm', 'f');

solution/1600-1699/1661.Average Time of Process per Machine/README.md

@@ -84,7 +84,20 @@ Activity table:
 ### **SQL**
 
 ```sql
-
+# Write your MySQL query statement below
+SELECT
+    machine_id,
+    round(
+        avg(
+            CASE
+                WHEN activity_type = 'start' THEN -timestamp
+                ELSE timestamp
+            END
+        ) * 2,
+        3
+    ) AS processing_time
+FROM Activity
+GROUP BY machine_id;
 ```
 
 <!-- tabs:end -->

solution/1600-1699/1661.Average Time of Process per Machine/README_EN.md

@@ -80,7 +80,20 @@ Machine 2's average time is ((4.512 - 4.100) + (5.000 - 2.500)) / 2 = 1.456
 ### **SQL**
 
 ```sql
-
+# Write your MySQL query statement below
+SELECT
+    machine_id,
+    round(
+        avg(
+            CASE
+                WHEN activity_type = 'start' THEN -timestamp
+                ELSE timestamp
+            END
+        ) * 2,
+        3
+    ) AS processing_time
+FROM Activity
+GROUP BY machine_id;
 ```
 
 <!-- tabs:end -->

solution/1600-1699/1661.Average Time of Process per Machine/Solution.sql

@@ -0,0 +1,14 @@
+# Write your MySQL query statement below
+SELECT
+    machine_id,
+    round(
+        avg(
+            CASE
+                WHEN activity_type = 'start' THEN -timestamp
+                ELSE timestamp
+            END
+        ) * 2,
+        3
+    ) AS processing_time
+FROM Activity
+GROUP BY machine_id;

solution/1600-1699/1677.Product's Worth Over Invoices/README.md

@@ -93,7 +93,18 @@ Result 表：
 ### **SQL**
 
 ```sql
-
+# Write your MySQL query statement below
+SELECT
+    name,
+    ifnull(sum(rest), 0) AS rest,
+    ifnull(sum(paid), 0) AS paid,
+    ifnull(sum(canceled), 0) AS canceled,
+    ifnull(sum(refunded), 0) AS refunded
+FROM
+    Product
+    LEFT JOIN Invoice USING (product_id)
+GROUP BY product_id
+ORDER BY name;
 ```
 
 <!-- tabs:end -->

solution/1600-1699/1677.Product's Worth Over Invoices/README_EN.md

@@ -96,7 +96,18 @@ Invoice table:
 ### **SQL**
 
 ```sql
-
+# Write your MySQL query statement below
+SELECT
+    name,
+    ifnull(sum(rest), 0) AS rest,
+    ifnull(sum(paid), 0) AS paid,
+    ifnull(sum(canceled), 0) AS canceled,
+    ifnull(sum(refunded), 0) AS refunded
+FROM
+    Product
+    LEFT JOIN Invoice USING (product_id)
+GROUP BY product_id
+ORDER BY name;
 ```
 
 <!-- tabs:end -->

solution/1600-1699/1677.Product's Worth Over Invoices/Solution.sql

@@ -0,0 +1,12 @@
+# Write your MySQL query statement below
+SELECT
+    name,
+    ifnull(sum(rest), 0) AS rest,
+    ifnull(sum(paid), 0) AS paid,
+    ifnull(sum(canceled), 0) AS canceled,
+    ifnull(sum(refunded), 0) AS refunded
+FROM
+    Product
+    LEFT JOIN Invoice USING (product_id)
+GROUP BY product_id
+ORDER BY name;