Question

尝试在mariadb中创建“子系统”表时，我一直收到错误。我能够成功地在mysql中运行这个，但是当我尝试使用mariadb时，我得到的错误是我猜的是语法相关的或者我完全没有关于外键的错误。这是我首先创建的表，首先尝试创建父表...

-- Creating Tables 
DROP TABLE IF EXISTS Storage_Type;
CREATE TABLE Storage_Type (
stor_model VARCHAR(10) NOT NULL,
stor_class VARCHAR(12) NOT NULL,
stor_name VARCHAR(15) NOT NULL,
CONSTRAINT pk_stor_model PRIMARY KEY (stor_model)
);

DROP TABLE IF EXISTS Service_Level;
CREATE TABLE Service_Level (
serv_level CHAR(2) NOT NULL,
serv_name VARCHAR(30),
serv_maxiops VARCHAR(7),
CONSTRAINT pk_serv_level PRIMARY KEY (serv_level)
);

DROP TABLE IF EXISTS Site;
CREATE TABLE Site (
site_num VARCHAR(10) NOT NULL,
site_name VARCHAR(15) NOT NULL,
site_address VARCHAR(30) NOT NULL,
site_suburb VARCHAR(20) NOT NULL,
site_city VARCHAR(15) NOT NULL,
site_pcode CHAR(4) NOT NULL,
CONSTRAINT pk_site_num PRIMARY KEY (site_num)
);

---No sure what i'm doing wrong on this table??
DROP TABLE IF EXISTS Customer;
CREATE TABLE Customer (
site_num VARCHAR(10) NOT NULL,
cust_name VARCHAR(20) NOT NULL,
site_description VARCHAR(50) NOT NULL,
CONSTRAINT pk_site_num PRIMARY KEY (site_num),
CONSTRAINT fk_site_num FOREIGN KEY (site_num) REFERENCES Site(site_num)
);

DROP TABLE IF EXISTS Pools;
CREATE TABLE Pools (
sub_serial MEDIUMINT NOT NULL,
pool_id CHAR(3) NOT NULL,
data_date DATE NOT NULL,
pool_name VARCHAR(30),
pool_type CHAR(4),
pool_totalcapacity INT NOT NULL,
pool_usedcapacity INT NOT NULL,
pool_usedpercent INT,
pool_availablecapacity INT NOT NULL,
pool_subscribedcapacity INT,
pool_subscriptionpercent INT,
serv_level CHAR(2),
CONSTRAINT pk_pool PRIMARY KEY (sub_serial, pool_id, data_date),
CONSTRAINT fk_serv_level FOREIGN KEY (serv_level) REFERENCES Service_Level(serv_level)
);

DROP TABLE IF EXISTS Costs;
CREATE TABLE Costs (
cost_date DATE NOT NULL,
serv_level CHAR(2),
cost_gbmonth VARCHAR(10),
cost_gbday VARCHAR(10),
CONSTRAINT pk_cost PRIMARY KEY (cost_date,serv_level),
CONSTRAINT fk_cost FOREIGN KEY (serv_level) REFERENCES Service_Level(serv_level)
);

--------ISSUES creating this table.....
DROP TABLE IF EXISTS Subsystem;
CREATE TABLE Subsystem (
sub_serial MEDIUMINT NOT NULL,
sub_name VARCHAR(10) NOT NULL,
stor_model VARCHAR(10) NOT NULL,
cust_name VARCHAR(50) UNIQUE,
CONSTRAINT pk_subsys PRIMARY KEY (sub_serial),
CONSTRAINT fk_subsys_stor_model FOREIGN KEY (stor_model) REFERENCES Storage_Type(stor_model),
CONSTRAINT fk_subsys_cust_name FOREIGN KEY (cust_name) REFERENCES Customer(cust_name)
);

错误：

ERROR 1005 (HY000): Can't create table 'CBDB.Subsystem' (errno: 150)

我跑了一个 - SHOW ENGINE INNODB状态并得到以下内容，我似乎无法确定问题。

> ------------------------ LATEST FOREIGN KEY ERROR
> ------------------------ 171124 16:09:31 Error in foreign key constraint of table `CBDB`.`Subsystem`:  FOREIGN KEY (cust_name)
> REFERENCES Customer(cust_name) ): Cannot find an index in the
> referenced table where the referenced columns appear as the first
> columns, or column types in the table and the referenced table do not
> match for constraint. Note that the internal storage type of ENUM and
> SET changed in tables created with >= InnoDB-4.1.12, and such columns
> in old tables cannot be referenced by such columns in new tables.

关于我哪里出错的任何提示或想法？

干杯

Answer 1

一段时间后，查看“show engine innodb status”的详细信息，并使用mariadb错误代码引用它。他们表示Customer表上缺少一个索引，因为主键是另一个表的引用值。我创建了一个索引：

create index idx_cust on Customer(cust_name);

创建表之后

，但是在表创建中有语法。通过创建索引，我能够正确引用外键。有趣的是，这可能会帮助其他人处理稍微模糊的错误消息。

ERROR 1005（HY000）：无法创建表'CBDB.Subsystem'（错误号：150）

1 个答案: