SQL Update語句（MS ACCESS）

Question

我執行了以下語句，但是它僅更新除Assasin信條（空白值）以外的所有價格行。 此外，我表中其他未在下面定義的行也被清除（空白值）。 如果我更新2種產品，它似乎正常工作。 有什么事嗎

（僅用於顯示包裝的換行符）

"UPDATE Products SET Price = IIf(Product = 'Crysis Wars'," +
CrysisWarsInput.Text +
", IIf(Product = 'Far Cry 2'," + FarCry2Input.Text +
", IIf(Product = 'Day of Defeat Source'," + DODSourceInput.Text +
", IIf(Product = 'GTA 4'," + GTA4Input.Text +
", IIf(Product = 'Asassins Creed'," + AssassinsCreedInput.Text + ")))))";

Answer 1

也許是因為您誤記了“刺客信條”？ 設置WHERE子句，或在最后一個IIF中將Price添加為默認值

"UPDATE Products SET Price = " +
"  IIf(Product = 'Crysis Wars',"          + CrysisWarsInput.Text +
", IIf(Product = 'Far Cry 2',"            + FarCry2Input.Text +
", IIf(Product = 'Day of Defeat Source'," + DODSourceInput.Text +
", IIf(Product = 'GTA 4',"                + GTA4Input.Text +
", IIf(Product = 'Assasins Creed',"       + AssassinsCreedInput.Text + ", Price)))))";

• 表中未在下面定義的其他行

這就是WHERE子句的目的，以限制要更新的記錄。

"UPDATE Products SET Price = " +
"  IIf(Product = 'Crysis Wars',"          + CrysisWarsInput.Text +
", IIf(Product = 'Far Cry 2',"            + FarCry2Input.Text +
", IIf(Product = 'Day of Defeat Source'," + DODSourceInput.Text +
", IIf(Product = 'GTA 4',"                + GTA4Input.Text +
", "                                      + AssassinsCreedInput.Text + ")))) +
" WHERE Product in ('Crysis Wars','Far Cry 2','Day of Defeat Source'," +
"  'GTA 4','Assasins Creed')";

您也可以使用SWITCH語句代替多個IIF。

Answer 2

重新刺殺信條-可能是錯字。 非常仔細地查看單元格和查詢中的值-例如，是刺客還是刺客？

重新其他（不在查詢中）； 您需要添加一個“ where”子句，否則它適用於表中的每一行； 這就是SQL的工作方式...我猜這里最好使用IN過濾器。 例子

where Product in ('some title', 'another title', ...)