php - 将数据库表中特定列的数据相加

Question

我有这些来自表格的数据。例如，我有一个名为 tbl_points 的点表。tbl_points 包含：

ptsID, team1, team2.
1       10      20
2       20      10
3       30      5

如何创建一个查询来总结 team1 和 team2 的积分？

Answer 1

未经测试：

   SELECT SUM(p1.team1) AS team1_score
        , SUM(p2.team2) AS team2_score
     FROM tbl_points AS p1
        , tbl_points AS p2

Answer 2

以下查询：

SELECT 
  SUM(team1) AS team1_points, 
  SUM(team2) AS team2_points
FROM
  tbl_points

结果会给你一个单行表：

| team1_points | team2_points |
| 60           | 35           |

此外，使用名称tbl_points也不好。最好不使用前缀。只需为您的表命名points，就足够清楚了。