由于我需要合并两个SQL结果以在结果集中形成一行。
我试图利用union函数。但是结果在结果集中有两行，其中oponent_*列完全离开了opposer_*列。但是它应该在结果集中同时包含这两个列。这是下面的代码
SELECT DISTINCT
`team_member`.`Team_ID` AS oponent_Team_ID,
`team`.`Founder_ID` AS oponent_Founder_ID,
`team`.`Team_Logo` AS oponent_Team_Logo,
`team`.`team_Name` AS oponent_Founder_ID,
`teams_game_match`.`team_1_id` AS oponent_team_1_id,
`teams_game_match`.`team_2_id` AS oponent_team_2_id,
`teams_game_match`.`game_time` AS oponent_game_time,
`teams_game_match`.`game_date` AS oponent_game_date,
`teams_game_match`.`game_name` AS oponent_game_name,
`teams_game_match`.`accept` AS oponent_accept
FROM
`team_member`
JOIN `team`
ON `team_member`.`Team_ID` = `team`.`Team_ID`
JOIN `teams_game_match`
ON `teams_game_match`.`team_2_id` = `team`.`Team_ID`
WHERE `teams_game_match`.`team_1_id` = '11'
UNION
SELECT DISTINCT
`team_member`.`Team_ID` AS opposer_Team_ID,
`team`.`Founder_ID` AS opposer_Founder_ID,
`team`.`Team_Logo` AS opposer_Team_Logo,
`team`.`team_Name` AS opposer_Founder_ID,
`teams_game_match`.`team_1_id` AS opposer_team_1_id,
`teams_game_match`.`team_2_id` AS opposer_team_2_id,
`teams_game_match`.`game_time` AS opposer_game_time,
`teams_game_match`.`game_date` AS opposer_game_date,
`teams_game_match`.`game_name` AS opposer_game_name,
`teams_game_match`.`accept` AS opposer_accept
FROM
`team_member`
JOIN `team`
ON `team_member`.`Team_ID` = `team`.`Team_ID`
JOIN `teams_game_match`
ON `teams_game_match`.`team_1_id` = `team`.`Team_ID`
WHERE `teams_game_match`.`team_2_id` = '11'
实际结果：
+-----------------+--------------------+-------------------+--------------------+-------------------+-------------------+-------------------+-------------------+-------------------+----------------+
| oponent_Team_ID | oponent_Founder_ID | oponent_Team_Logo | oponent_Founder_ID | oponent_team_1_id | oponent_team_2_id | oponent_game_time | oponent_game_date | oponent_game_name | oponent_accept |
+-----------------+--------------------+-------------------+--------------------+-------------------+-------------------+-------------------+-------------------+-------------------+----------------+
| 4 | 1 | 486396439.png | Nish | 11 | 4 | 1:30am | 2019-06-28 | Battlefield 4 | 0 |
| 13 | 7 | 557132285.png | BFM | 13 | 11 | 1:30am | 2019-07-12 | FIFA 17 | 1 |
+-----------------+--------------------+-------------------+--------------------+-------------------+-------------------+-------------------+-------------------+-------------------+----------------+
2 rows in set (0.00 sec)
预期结果：
+-----------------+--------------------+-------------------+--------------------+-------------------+-------------------+-------------------+-------------------+-------------------+----------------+-----------------+--------------------+-------------------+--------------------+-------------------+-------------------+-------------------+-------------------+-------------------+----------------+
| oponent_Team_ID | oponent_Founder_ID | oponent_Team_Logo | oponent_team_Name | oponent_team_1_id | oponent_team_2_id | oponent_game_time | oponent_game_date | oponent_game_name | oponent_accept | opposer_Team_ID | opposer_Founder_ID | opposer_Team_Logo | opposer_team_Name | opposer_team_1_id | opposer_team_2_id | opposer_game_time | opposer_game_date | opposer_game_name | opposer_accept |
+-----------------+--------------------+-------------------+--------------------+-------------------+-------------------+-------------------+-------------------+-------------------+----------------+-----------------+--------------------+-------------------+--------------------+-------------------+-------------------+-------------------+-------------------+-------------------+----------------+
| 4 | 1 | 486396439.png | Team 1 | 11 | 4 | 1:30am | 2019-06-28 | Battlefield 4 | 0 | 13 | 7 | 557132285.png | Team 3 | 13 | 11 | 1:30am | 2019-07-12 | FIFA 17 | 1 |
+-----------------+--------------------+-------------------+--------------------+-------------------+-------------------+-------------------+-------------------+-------------------+----------------+-----------------+--------------------+-------------------+--------------------+-------------------+-------------------+-------------------+-------------------+-------------------+----------------+
1 rows in set (0.00 sec)
需要获得一个结果，其中一行包含结果集中的不同列名。让我知道除此以外还有其他功能。
答案 0 :(得分：1)
您可以尝试使用case when
select max(case when flag=1 then oponent_Team_ID end) as oponent_Team_ID,
max(case when flag=0 then oponent_Team_ID end) as opposer_Team_ID
from
(
SELECT DISTINCT
`team_member`.`Team_ID` AS oponent_Team_ID,
`team`.`Founder_ID` AS oponent_Founder_ID,
`team`.`Team_Logo` AS oponent_Team_Logo,
`team`.`team_Name` AS oponent_Founder_Name,
`teams_game_match`.`team_1_id` AS oponent_team_1_id,
`teams_game_match`.`team_2_id` AS oponent_team_2_id,
`teams_game_match`.`game_time` AS oponent_game_time,
`teams_game_match`.`game_date` AS oponent_game_date,
`teams_game_match`.`game_name` AS oponent_game_name,
`teams_game_match`.`accept` AS oponent_accept, 1 as flag
FROM
`team_member`
JOIN `team`
ON `team_member`.`Team_ID` = `team`.`Team_ID`
JOIN `teams_game_match`
ON `teams_game_match`.`team_2_id` = `team`.`Team_ID`
WHERE `teams_game_match`.`team_1_id` = '11'
UNION
SELECT DISTINCT
`team_member`.`Team_ID` AS opposer_Team_ID,
`team`.`Founder_ID` AS opposer_Founder_ID,
`team`.`Team_Logo` AS opposer_Team_Logo,
`team`.`team_Name` AS opposer_Founder_ID,
`teams_game_match`.`team_1_id` AS opposer_team_1_id,
`teams_game_match`.`team_2_id` AS opposer_team_2_id,
`teams_game_match`.`game_time` AS opposer_game_time,
`teams_game_match`.`game_date` AS opposer_game_date,
`teams_game_match`.`game_name` AS opposer_game_name,
`teams_game_match`.`accept` AS opposer_accept,0
FROM
`team_member`
JOIN `team`
ON `team_member`.`Team_ID` = `team`.`Team_ID`
JOIN `teams_game_match`
ON `teams_game_match`.`team_1_id` = `team`.`Team_ID`
WHERE `teams_game_match`.`team_2_id` = '11'
)A