feat: add solutions to lc problem: No.1212

No.1212.Team Scores in Football Tournament

Author: yanglbme

solution/1200-1299/1212.Team Scores in Football Tournament/README.md

@@ -100,7 +100,16 @@ Teams </code>table:
 ### **SQL**
 
 ```sql
-
+# Write your MySQL query statement below
+SELECT  t.team_id
+       ,t.team_name
+       ,SUM(CASE WHEN t.team_id = m.host_team AND m.host_goals > m.guest_goals THEN 3 WHEN m.host_goals = m.guest_goals THEN 1 WHEN t.team_id = m.guest_team AND m.guest_goals > m.host_goals THEN 3 ELSE 0 END) AS num_points
+FROM Teams t
+LEFT JOIN Matches m
+ON t.team_id = m.host_team OR t.team_id = m.guest_team
+GROUP BY  t.team_id
+ORDER BY num_points DESC
+         ,team_id;
 ```
 
 <!-- tabs:end -->

solution/1200-1299/1212.Team Scores in Football Tournament/README_EN.md

@@ -95,7 +95,16 @@ Matches table:
 ### **SQL**
 
 ```sql
-
+# Write your MySQL query statement below
+SELECT  t.team_id
+       ,t.team_name
+       ,SUM(CASE WHEN t.team_id = m.host_team AND m.host_goals > m.guest_goals THEN 3 WHEN m.host_goals = m.guest_goals THEN 1 WHEN t.team_id = m.guest_team AND m.guest_goals > m.host_goals THEN 3 ELSE 0 END) AS num_points
+FROM Teams t
+LEFT JOIN Matches m
+ON t.team_id = m.host_team OR t.team_id = m.guest_team
+GROUP BY  t.team_id
+ORDER BY num_points DESC
+         ,team_id;
 ```
 
 <!-- tabs:end -->

solution/1200-1299/1212.Team Scores in Football Tournament/Solution.sql

@@ -0,0 +1,10 @@
+# Write your MySQL query statement below
+SELECT  t.team_id
+       ,t.team_name
+       ,SUM(CASE WHEN t.team_id = m.host_team AND m.host_goals > m.guest_goals THEN 3 WHEN m.host_goals = m.guest_goals THEN 1 WHEN t.team_id = m.guest_team AND m.guest_goals > m.host_goals THEN 3 ELSE 0 END) AS num_points
+FROM Teams t
+LEFT JOIN Matches m
+ON t.team_id = m.host_team OR t.team_id = m.guest_team
+GROUP BY  t.team_id
+ORDER BY num_points DESC
+         ,team_id;