sql - 检查多列约束

Question

我有一个依赖的表

CREATE TABLE DEPENDANT (DEPENDANT_NM VARCHAR2(15) PRIMARY KEY,
  DEP_GENDER CHAR(1), DEP_BDAT DATE, RELATED_HOW VARCHAR2 (8), ESSNO CHAR(9));
ALTER TABLE DEPENDANT ADD CONSTRAINT FK_ESSNO FOREIGN KEY (ESSNO)
 REFERENCES HW_EMPLOYEE(SSNO);
ALTER TABLE DEPENDANT ADD CONSTRAINT CK_DEP_GENDER CHECK
(DEP_GENDER IN ('M','F'));

我需要添加一个约束，以确保女性家属只能被称为“女儿”或“配偶”，而男性家属只能被称为“儿子”或“配偶”

我是否使用像...这样的检查约束

ALTER TABLE DEPENDANT ADD CONSTRAINT CK_RELATEDF CHECK (DEP_GENDER = 'F' AND 
RELATED_HOW IN('Daughter' OR 'Spouse'));

Answer 1

你必须这样写:

ALTER TABLE DEPENDANT 
    ADD CONSTRAINT CK_RELATEDF 
        CHECK (DEP_GENDER = 'F' AND RELATED_HOW IN ('Daughter', 'Spouse'));

编辑:您必须在一次检查中完成:

ALTER TABLE DEPENDANT ADD CONSTRAINT CK_RELATEDF
  CHECK ((DEP_GENDER = 'F' AND RELATED_HOW IN ('Daughter', 'Spouse'))
    OR (DEP_GENDER = 'M' AND RELATED_HOW IN ('Son', 'Spouse')));