[英]SQL error - Cannot add foreign key constraint
我正在尝试使用Java(jdbc)在数据库中创建一些表。 我下面得到的“代码”只有两个字符串,每个字符串包含一个SQL CREATE TABLE更新,一个用于表“ store_sales”,一个用于表“ store_returns”
java.sql.SQLException:无法添加外键约束
当我尝试将store_returns.sr_ticket_number用作引用“代码”最后一行中的store_sales.ss_ticket_number的外键时,会发生这种情况
有任何想法吗? 提前致谢。
"CREATE TABLE IF NOT EXISTS store_sales ("
+ "ss_sold_date_sk int,"
+ "ss_sold_time_sk int,"
+ "ss_item_sk int not null,"
+ "ss_customer_sk int,"
+ "ss_cdemo_sk int,"
+ "ss_hdemo_sk int,"
+ "ss_addr_sk int,"
+ "ss_store_sk int,"
+ "ss_promo_sk int,"
+ "ss_ticket_number int not null,"
+ "primary key (ss_item_sk,ss_ticket_number),"
+ "foreign key (ss_sold_date_sk) references date_dim (d_date_sk),"
+ "foreign key (ss_sold_time_sk) references time_dim (t_time_sk),"
+ "foreign key (ss_item_sk) references item (i_item_sk),"
+ "foreign key (ss_customer_sk) references customer (c_customer_sk),"
+ "foreign key (ss_cdemo_sk) references customer_demographics (cd_demo_sk),"
+ "foreign key (ss_hdemo_sk) references household_demographics (hd_demo_sk),"
+ "foreign key (ss_addr_sk) references customer_address (ca_address_sk),"
+ "foreign key (ss_store_sk) references store (s_store_sk),"
+ "foreign key (ss_promo_sk) references promotion (p_promo_sk)"
+ ")"
,
"CREATE TABLE IF NOT EXISTS store_returns ("
+ "sr_return_date_sk int,"
+ "sr_return_time_sk int,"
+ "sr_item_sk int not null,"
+ "sr_customer_sk int,"
+ "sr_cdemo_sk int,"
+ "sr_hdemo_sk int,"
+ "sr_addr_sk int,"
+ "sr_store_sk int,"
+ "sr_reason_sk int,"
+ "sr_ticket_number int not null,"
+ "primary key (sr_item_sk,sr_ticket_number),"
+ "foreign key (sr_return_date_sk) references date_dim (d_date_sk),"
+ "foreign key (sr_return_time_sk) references time_dim (t_time_sk),"
+ "foreign key (sr_item_sk) references item (i_item_sk),"
+ "foreign key (sr_customer_sk) references customer (c_customer_sk),"
+ "foreign key (sr_cdemo_sk) references customer_demographics (cd_demo_sk),"
+ "foreign key (sr_hdemo_sk) references household_demographics (hd_demo_sk),"
+ "foreign key (sr_addr_sk) references customer_address (ca_address_sk),"
+ "foreign key (sr_store_sk) references store (s_store_sk),"
+ "foreign key (sr_reason_sk) references reason (r_reason_sk),"
+ "foreign key (sr_ticket_number) references store_sales (ss_ticket_number)"
+ ")"
您不能在store_sales中将外键约束添加到组合外键的一部分,例如(ss_item_sk,ss_ticket_number)。 对于外键约束,您必须解决引用表的主键的所有部分。
就像是
foreign key (sr_item_sk, sr_ticket_number) references store_sales (ss_item_sk,ss_ticket_number)
应该管用
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