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我想在兩個簡單的表上寫一個查詢。表很簡單,查詢不是:)SQLITE:內聯視圖還是嵌套子查詢?
這裏是表內容的概述:
我試圖編寫一個查詢來列出相應表中的所有資產,只有當它們被標記爲「wanted」(意味着boolean字段asset_owned = 0)並且被另一個所有者引用爲「owned」時。
這是我迄今爲止,它的工作原理:
SELECT
user.user_pseudo AS REQUESTER,
asset.asset_sku AS SKU,
asset.asset_name AS ASSET_NAME
FROM
asset
INNER JOIN user ON asset.id_user = user.id
WHERE
asset.asset_owned = 0
AND
asset.asset_sku IN (SELECT asset.asset_sku FROM asset WHERE asset.asset_owned = 1)
但是,在同一個查詢(如果可能的話),我想獲得所有者名稱爲好。
這些表這樣一個查詢的第一個結果是:
我,003,Test003,你。
我試過在線SELECT和嵌套子查詢,如:
SELECT
user.user_pseudo as ASKER,
asset.asset_sku as SKU,
asset.asset_name as NAME,
subquery1.user.user_pseudo as OWNER
FROM
asset
INNER JOIN user ON asset.id_user = user.id,
(SELECT user.user_pseudo.asset_asset_sku FROM asset INNER JOIN user ON asset.id_user = user.id WHERE asset.asset_owned = 1) subquery1
WHERE
asset.asset_owned = 0 AND
subquery1.asset.asset_sku IN (SELECT asset.asset_sku FROM asset INNER JOIN user ON asset.id_user = user.id WHERE asset.asset_owned=1)
但當然不工作的。
感謝您指點我的任何方向。
新年快樂
馬蒂亞斯
工程就像一個魅力,我學會了如何使用子查詢謝謝你。 非常感謝新年快樂! – Mathmathou