[英]CakePHP 3 - How do I use subquery in IN condition?
我必須建立以下查詢,但在select max()部分中不知道。
有這兩個表:
玩家
-------------
| id | name |
-------------
| 1 | AAAA |
-------------
| 2 | BBBB |
-------------
分數
----------------------------------------
| player_id | score | created |
----------------------------------------
| 1 | 1080 | 2015/12/28 15:38 |
----------------------------------------
| 1 | 1199 | 2015/12/28 16:00 |
---------------------------------------|
| 2 | 2400 | 2015/12/29 10:30 |
----------------------------------------
| 2 | 2420 | 2015/12/29 10:41 |
----------------------------------------
| 2 | 2031 | 2015/12/29 11:12 |
----------------------------------------
結果我希望擁有:
----------------------------
| id | name | latest_score |
----------------------------
| 1 | AAAA | 1199 |
----------------------------
| 2 | BBBB | 2031 |
----------------------------
SQL查詢#1-此查詢給出我想要的上述結果
SELECT
players.id AS id,
players.name AS name,
scores.player_id,
scores.score AS latest_score,
scores.created
FROM
players
JOIN scores ON
players.id = scores.player_id
WHERE
scores.created IN(
SELECT MAX(scores.created)
FROM
scores
WHERE
scores.player_id= player.id
)
SQL查詢#2-通過@ tim-biegeleisen,也可以使用,所以還是可以幫助我建立此查詢?
SELECT p.id, p.name, s1.score AS latest_score
FROM players p INNER JOIN scores s1
ON p.id = s1.player_id
INNER JOIN
(
SELECT s.player_id, MAX(s.created) AS latest
FROM scores s
GROUP BY s.player_id
) s2
ON s1.player_id = s2.player_id AND s1.created = s2.latest
目前正在嘗試建立類似:
$query = $this->Players->find()
->select([
"Players.id",
"Players.name",
"Scores.scores",
"Scores.created"
])
->join([
"Scores" => [
"table" => "scores",
"type" => "left",
"conditions" => "Players.id = Scores.player_id"
]
])
->where([
"Scores.created" =>
$this->Players->Scores->find()
->select(["MAX(Scores.created)"])
->where(["Scores.player_id = Players.id"])
]);
問題是,此生成器不起作用:SQLSTATE [42000]:語法錯誤或訪問沖突:1064您的SQL語法有錯誤;可能有錯誤。 檢查與您的MariaDB服務器版本相對應的手冊以獲取正確的語法,以在第1行的'MAX(`Scores__created`)FROM scores Scores WHERE Scores.player_id = Players.i'附近使用
我不想只是建立一個Scores.created
,然后訂購Scores.created
desc,並抓住[0]
來獲得第一行。 您知道如何建立此查詢嗎? 請幫忙。
謝謝!
嘗試使用CakePHP SQL函數語法:
$subquery = $this->Players->Scores->find();
$query = $this->Players->find()
->select([
"Players.id",
"Players.name",
"Scores.scores",
"Scores.created"
])
->join([
"Scores" => [
"table" => "scores",
"type" => "left",
"conditions" => "Players.id = Scores.player_id"
]
])
->where([
"Scores.created" => $subquery
->select([$subquery->func()->max('Scores.created')])
->where(["Scores.player_id = Players.id"])
]);
我不是CakePHP專家,但是我可以為您提供以下聯接查詢,該查詢避免了WHERE
子句中的子查詢。 也許這可以幫助您找到解決問題的方法。
SELECT p.id, p.name, s1.score AS latest_score
FROM players p INNER JOIN scores s1
ON p.id = s1.player_id
INNER JOIN
(
SELECT s.player_id, MAX(s.created) AS latest
FROM scores s
GROUP BY s.player_id
) s2
ON s1.player_id s2.player_id AND s1.created = s2.latest
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