Question

  CREATE TABLE LOCATION(
   street_address VARCHAR(40)   NOT NULL,
    postal_code    VARCHAR(12)  NOT NULL,
   city           VARCHAR(30)   NOT NULL,
   state_province VARCHAR(25)       NULL,
 country_name   VARCHAR(40) NOT NULL,
   CONSTRAINT LOCATION_PK PRIMARY KEY(street_address, postal_code, city, 
 country_name),
  CONSTRAINT LOCATION_CK UNIQUE(street_address, city, state_province, 
   country_name),
  CONSTRAINT LOCATION_FK FOREIGN KEY(country_name)
      REFERENCES COUNTRY(country_name) );


  CREATE TABLE DEPARTMENT(
department_name VARCHAR(30) NOT NULL,
  street_address VARCHAR(40)    NOT NULL,
postal_code    VARCHAR(12)  NOT NULL,
 city           VARCHAR(30) NOT NULL,
 country_name   VARCHAR(40) NOT NULL,
manager_id     DECIMAL(6)       NULL,
CONSTRAINT DEPARTMENT_PK PRIMARY KEY(department_name),
CONSTRAINT DEPARTMENT_FK1 FOREIGN KEY(street_address, postal_code, city, 
country_name)
    REFERENCES LOCATION(street_address, postal_code, city, country_name) );


 CREATE TABLE COUNTRY(
 country_name    VARCHAR(40)    NOT NULL,
   region_name     VARCHAR(25)     NOT NULL,
   CONSTRAINT COUNTRY_PK PRIMARY KEY(country_name),
   CONSTRAINT COUNTRY_FK FOREIGN KEY(region_name)
     REFERENCES REGION(region_name) );

我需要更新我的部门会计已移至新位置。新地址是马来西亚八打灵再也梳邦再也3 Subang 1。邮政编码是47500.我已经加入了这3个表，但它仍然无法正常工作。为什么？这是我的sql更新代码：

  UPDATE DEPARTMENT a
 INNER JOIN LOCATION b ON a.street address = b.street address
  AND a.postal_code = b.postal_code
    AND a.city=b.city
  AND a.country_name = b.county_name
  JOIN COUNTRY c
  on b.country_name = c.country_name
  SET a.street_address = 'subang 1 ,subang jaya ',
 b.street_address = 'subang 1 ,subang jaya ',
 a.postal_code = '31546',
 b.postal_code = '31546',
 a.city = 'PETALING JAYA ',
  b.city = 'PETALING JAYA ',
  a.country_name = 'MALAYSIA',
  b.country_name = 'MALAYSIA',
   c.country_name = 'MALAYSIA'
  WHERE DEPARTMENT = 'Accounting';

它说无法更新，外键失败。无法删除或更新父行：a 外键约束失败

Answer 1

你必须省略where子句之前的最后一个逗号：

....
b.country_name = 'MALAYSIA' --no comma here 
WHERE DEPARTMENT = 'Accounting';

Answer 2

查看表格，您需要在最后一行上使用alias.column

WHERE.department_name ='会计'

Answer 3

我必须从您发布的问题中做出几个假设。如果假设不正确，请告诉我们。首先，我必须根据[COUNTRY_FK]的外键引用创建另一个表[REGION]。

CREATE 
TABLE   REGION (
    region_name     VARCHAR(25)     NOT NULL,

    CONSTRAINT REGION_PK PRIMARY KEY(region_name)
);

接下来，我根据您的原始[UPDATE]重新构建了更新sql语句，以更新表[DEPARTMENT]

UPDATE DEPARTMENT 
  SET 
        street_address = 'subang 1 ,subang jaya ',
        postal_code    = '31546',
        city           = 'PETALING JAYA ',
        country_name   = 'MALAYSIA'
FROM  DEPARTMENT a
INNER 
JOIN LOCATION b  ON  a.street_address = b.street_address
                 AND a.postal_code    = b.postal_code
                 AND a.city           = b.city
                 AND a.country_name   = b.country_name
JOIN COUNTRY c   ON  b.country_name   = c.country_name
WHERE a.department_name = 'Accounting';

如果您尝试更新多个表，可以在[TRANSACTION]语句中构建更新。

错误在mysql中更新我的表

3 个答案: