创建表：ORA-00936：缺少表达式

Question

使用以下命令在SQL中创建表时，我收到ORA-00936：表达式错误消息。我绊倒的任何想法？

CREATE TABLE Workorders (
    Wo# VARCHAR2(8) PRIMARY KEY,
    Proj# VARCHAR2(8) REFERENCES Project (Proj#),
    Wo_desc VARCHAR2(30) NOT NULL UNIQUE,
    Wo_assigned CHAR(40),
    Wo_hours NUMBER(6) NOT NULL CHECK(>0),
    Wo_start DATE,
    Wo_due DATE,
    Wo_complete CHECK (Wo_complete IN ('Y','N')));

Answer 1

您不能像这样定义检查约束，您需要检查中的列名：

CREATE TABLE Workorders (
    Wo# VARCHAR2(8) PRIMARY KEY,
    Proj# VARCHAR2(8) REFERENCES Project (Proj#),
    Wo_desc VARCHAR2(30) NOT NULL UNIQUE,
    Wo_assigned CHAR(40),
    Wo_hours NUMBER(6,0) NOT NULL CHECK ( wo_hours > 0 ),
    Wo_start DATE,
    Wo_due DATE,
    Wo_complete CHAR(1) CHECK (Wo_complete IN ('Y','N') )
);