我有桌子'球员'和'奖项'。我有一些重复的播放器条目具有不同的ID,但相同的信息。
我正在尝试更新与第二个玩家条目相关联的奖励,以便最终删除重复项。
这显然不是最有效的查询,但它只需要运行一次,并且只有10-15个重复。 到目前为止,我有这个:
UPDATE aw
SET aw.player_id = map.id1
FROM awards as aw,
(SELECT a.id as id1, b.id as id2
FROM players a, players b
WHERE a.first_name = b.first_name
AND a.last_name = b.last_name
AND a.id != b.id
AND a.team is not null
AND a.college is not null) as map
WHERE map.id2 = aw.player_id
这给了我一个未指定的语法错误,但如果我用just替换前两行 “选择aw.player_id,map.id1”,它返回一个带有预期值的两列表(因此列名和表引用都是正确的。)
我必须遗漏一些明显的东西,但它是什么?
答案 0 :(得分:3)
UPDATE syntax中没有FROM。
您应该在SET
之前的UPDATE部分中定义表UPDATE awards as aw,
(SELECT a.id as id1, b.id as id2
FROM players a, players b
WHERE a.first_name = b.first_name
AND a.last_name = b.last_name
AND a.id != b.id
AND a.team is not null
AND a.college is not null) as map
SET aw.player_id = map.id1
WHERE map.id2 = aw.player_id
答案 1 :(得分:0)
这应该在语法上是正确的。但是,我不确定它是否符合您的要求。 首先测试暂存数据!
UPDATE
players AS a
INNER JOIN
players AS b
ON
a.first_name = b.first_name
AND a.last_name = b.last_naem
AND a.id != b.id
AND a.team IS NOT NULL
AND a.college IS NOT NULL
INNER JOIN
awards AS aw
ON
b.id = aw.player_id
SET
aw.player_id = a.id