刪除行不會在另一個表與現有的複合主鍵的

Question

我使用SQLite，並試圖舊行從表學生Students_Old移動，複製從Students_Import新行。

的問題是我有多個主鍵爲：

CREATE TABLE "Students" (
`LastName` TEXT NOT NULL, 
`FirstName` TEXT NOT NULL, 
`BornDate` TEXT NOT NULL, 
`Class` TEXT NOT NULL, 
`Photo` TEXT, 
`ValidUntil` CHAR(10), 
PRIMARY KEY(LastName,FirstName,BornDate)) 

所有的表這種結構（除了Students_Import是不可少的照片和ValidUntil）。

到目前爲止，我已經成功地將舊行與此複製：

INSERT INTO Students_Old 
SELECT DISTINCT a.LastName, a.FirstName, a.BornDate, a.Class, a.Photo, a.ValidUntil FROM 
Students a LEFT JOIN Students_Import b ON a.LastName =b.LastName AND a.FirstName=b.FirstName AND a.BornDate=b.BornDate WHERE b.LastName is NULL; 

而與此添加新行：

INSERT INTO Students 
SELECT DISTINCT a.LastName, a.FirstName, a.BornDate, a.Class, "", "" FROM 
Students_Import a LEFT JOIN Students b ON a.LastName =b.LastName AND a.FirstName=b.FirstName AND a.BornDate=b.BornDate WHERE b.LastName is NULL 

但我不能想出如何刪除舊學生中的行（不存在於Students_Import中）。

我已經試過這幾個變量：

DELETE FROM Students WHERE (LastName, FirstName, BornDate) IN 
(SELECT DISTINCT a.LastName, a.FirstName, a.BornDate, a.Class, a.Photo, a.ValidUntil FROM 
Students a LEFT JOIN Students_Import b ON a.LastName =b.LastName AND a.FirstName=b.FirstName AND a.BornDate=b.BornDate WHERE b.LastName is NULL); 

但我只得到語法錯誤或者說，我不能用它在多行。

我將不勝感激任何幫助！

Answer 1

在不與多列工作。

要找到不另一個表中存在的行，使用NOT用correlated subquery存在：

DELETE FROM Students 
WHERE NOT EXISTS (SELECT 1 
        FROM Students_Import 
        WHERE Students_Import.LastName = Students.LastName 
        AND Students_Import.FirstName = Students.FirstName 
        AND Students_Import.BornDate = Students.BornDate); 

Answer 2

我不認爲你可以有IN子句中多列。

如何： DELETE Students FROM Students s LEFT JOIN Students_Import si ON (s.LastName = si.LastName AND s.FirstName = si.FirstName AND s.BornDate = si.BornDate) WHERE s.LastName IS NULL;