sql - 如何正确生成关于主键和外键的大随机 SQL 数据?
问题描述
最近我的任务是生成基于此 ER 图的大型测试数据库:https ://i.stack.imgur.com/I2kr9.png
我需要超过 300,000 行(组合),并且很容易通过 Excel 使用其随机函数生成表 Customer、Supplier 和 Product,但我不知道如何正确创建 Order 和 OrderItem 表,因为我需要将每个 UnitPrice 相乘和 Quantity 来自多行(具有匹配的 ID)以获得位于另一个表中的 TotalAmount,当然每个 PK 和 FK 都需要完全匹配。
我知道这是一个愚蠢的问题,但任何小技巧都会有所帮助,我是否需要通过 SQL 脚本、Excel 或任何其他方式直接创建都没关系。
先感谢您!
解决方案
:) 查看示例 Northwind 数据库。它已经有这些表了。字段名称和计数不是一对一匹配的,但易于编辑。
您只需要使用简单的插入来增加行。即:双倍客户:
insert into customers (FirstName, LastName, City, Country)
select FirstName+'2', LastName+'2', City, Country
from Customers;
300 K 行一点也不大,实际上很小。
PS:我假设您会将客户的 Id 更改为 int 身份列。在 Northwind 中,它是字符数据。
编辑:我承诺的代码。我知道这很丑:
-- Create a tally table
DECLARE @tally TABLE (n INT);
INSERT INTO @tally (n)
SELECT TOP(300000) ROW_NUMBER() OVER (ORDER BY t1.Object_ID)
FROM Master.sys.All_Columns t1
CROSS JOIN Master.sys.All_Columns t2;
-- 300K in total. But let's say we want 300K order items
-- Aprx. 1000 customers, each with 50 orders * 6 items per order
create table Customers (Id int identity primary key,
FirstName varchar(15),
LastName varchar(15),
City varchar(15),
Country varchar(15),
Phone varchar(15) );
create table Orders (Id int identity primary key,
OrderDate datetime,
OrderNumber int,
CustomerId int foreign key references Customers(Id),
TotalAmount money null);
create table Suppliers (id int identity primary key,
CompanyName varchar(15),
ContactName varchar(15),
ContactTitle varchar(15),
City varchar(15),
Country varchar(15),
Phone varchar(15),
Fax varchar(15));
create table Products (Id int identity primary key,
ProductName varchar(50),
SupplierId int foreign key references Suppliers(Id),
UnitPrice money,
Package varchar(20),
IsDiscontinued bit);
create table OrderItems (Id int identity primary key,
OrderId int foreign key references Orders(Id),
ProductId int foreign key references Products(Id),
UnitPrice money,
Quantity int);
INSERT INTO Customers
(
FirstName,
LastName,
City,
Country,
Phone
)
SELECT top 1000 'FirstName'+CAST(n AS VARCHAR(6)),
'LastName'+CAST(n AS VARCHAR(6)),
'City'+CAST(n%10 AS VARCHAR(6)),
'Country'+CAST(n%100 AS VARCHAR(6)),
'Phone'+cast(n as varchar(6))
from @tally;
insert into Orders (OrderDate, OrderNumber, CustomerId)
select t.d, t.n, c.Id
from customers c
cross apply (select top(50) n, dateadd(day, -n, getdate()) from @tally) t(n, d);
insert into Suppliers (CompanyName,
ContactName,
ContactTitle,
City,
Country,
Phone,
Fax)
SELECT top 10 'Company'+CAST(n AS VARCHAR(6)),
'Contact'+CAST(n AS VARCHAR(6)),
'Title'+CAST(n AS VARCHAR(6)),
'City'+CAST(n%10 AS VARCHAR(6)),
'Country'+CAST(n%100 AS VARCHAR(6)),
'Phone'+cast(n as varchar(6)),
'Fax'+cast(n as varchar(6))
from @tally;
with ts(n, sId) as (
select t.n, s.Id
from
(SELECT top(500) n from @tally) t, Suppliers s
)
insert into Products (ProductName,
SupplierId,
UnitPrice,
Package,
IsDiscontinued)
SELECT top(5000) 'Product'+CAST(n AS VARCHAR(6)),
sId,
n * 10,
'Package'+CAST(n%5 AS VARCHAR(6)),
case when n%1500 = 0 then 1 else 0 end
from ts order by newid();
with pdata (oid, pid) aS (
select top(300*1000)
abs(cast(checksum(newid()) as bigint)) % 50000 + 1,
abs(cast(checksum(newid()) as bigint)) % 5000 + 1
from @tally
order by newId())
insert into OrderItems
(OrderId,
ProductId,
UnitPrice,
Quantity)
select d.oid, d.pid, p.UnitPrice, abs(cast(checksum(newid()) as bigint)) % 20 + 1
from pData d inner join Products p on d.pid = p.id
order by d.oid, d.pid;
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