创建表错误 - 标识符无效答案

【问题标题】：Create table error - invalid identifier创建表错误 - 标识符无效
【发布时间】：2013-11-28 05:31:40
【问题描述】：

我正在尝试在 Oracle 11g express 中创建表，但收到错误“ORA-00904:invalid identifier”

CREATE TABLE Ingredients(
IngredientID    INTEGER     PRIMARY KEY     NOT NULL,
IngredientName  VARCHAR(255),
IngredientClassID   SMALLINT    NOT NULL,
MeasureAmountID     SMALLINT    NOT NULL,
CHECK (IngredientID>0),
CHECK (IngredientClassID>0),
FOREIGN KEY (IngredientClassID) REFERENCES Ingredient_Classes,
       ON UPDATE NO ACTION,
       ON DELETE CASCADE,
FOREIGN KEY (MeasureAmountID) REFERENCES Measurements,
        ON UPDATE NO ACTION,
        ON DELETE CASCADE
);

【问题讨论】：

标签： oracle

【解决方案1】：

您是否错过了外键中的 TableName(ColumnName) 并添加了额外的逗号。检查正确的语法http://docs.oracle.com/cd/E17952_01/refman-5.5-en/create-table-foreign-keys.html

我没有测试过下面的脚本。

CREATE TABLE Ingredients(
IngredientID    INTEGER     PRIMARY KEY     NOT NULL,
IngredientName  VARCHAR(255),
IngredientClassID   SMALLINT    NOT NULL,
MeasureAmountID     SMALLINT    NOT NULL,
CHECK (IngredientID>0),
CHECK (IngredientClassID>0),
FOREIGN KEY (IngredientClassID) REFERENCES Ingredient_Classes(ColumnName)
       ON UPDATE NO ACTION
       ON DELETE CASCADE,
FOREIGN KEY (MeasureAmountID) REFERENCES Measurements(ColumnName)
        ON UPDATE NO ACTION
        ON DELETE CASCADE
);

【讨论】：

DERP 时刻，是的，我确实忘记了列名。但是，这会产生一个新错误“ORA-00905：缺少关键字”