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我有一個sqlite數據庫,我在我的C#項目中使用System.Data.SQLite。Sqlite數據庫給我警告
我的要求是:
SELECT d1.* FROM DYN_table as d1 INNER JOIN (SELECT id_bill, ordre_phase, type, MAX(valeur) maximum FROM DYN_table WHERE id_customer=347 AND type IN (1,5,2) GROUP BY id_bill, ordre_phase, type) as d2 ON d1.type = d2.type AND d1.valeur = d2.maximum AND d1.ordre_phase=d2.ordre_phase AND d1.id_bill=d2.id_bill WHERE d1.id_customer=347 AND d1.type IN (1,5,2)
的要求是工作,但我有以下警告:
SQLite warning (284): automatic index on sqlite_sq_1E5A8EC0(id_bill)
當我嘗試了我的請求使用「解釋QUERY PLAN」我看到的最後一步是:
SEARCH SUBQUERY 1 AS d2 USING AUTOMATIC COVERING INDEX (id_bill=? AND ordre_phase=? AND type=?)
但是在這個表中有一個id_bill的索引,我有的所有索引: -Primary鍵:id_player,id_bill,ordre_phase,類型 型 -id_player -ordre_phase -id_competition
我試圖創建id_bill,ordre_phase和類型,但還是同樣的「使用自動覆蓋索引索引「在分析。
我錯過了什麼嗎?