從數據庫表中的特定列中添加數據

Question

我從表中獲得這些數據。例如，我有表名爲tbl_points的點。 tbl_points包含：

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

如何創建一個查詢，將總結點TEAM1和TEAM2？

Answer 1

以下查詢：

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

會給你一個單行表作爲結果：

| team1_points | team2_points | 
| 60   | 35   | 

此外，使用名稱tbl_points不好。最好不要使用前綴。只要將你的名字命名爲points，這就足夠清楚了。

Answer 2

未經測試：

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