简单快捷:
CREATE TABLE [dbo].[Lists](
[ListId] [int] IDENTITY(1,1) NOT NULL,
[ListName] [varchar](100) NOT NULL,
--these could be associated with lists or options, wasn't specified
[AssociatedDept] [int] NULL,
[Other2] [nchar](10) NULL,
[Other3] [nchar](10) NULL
) ON [PRIMARY]
CREATE TABLE [dbo].[Options](
[OptionId] [int] IDENTITY(1,1) NOT NULL,
[ListId] [int] NOT NULL,
[DisplayValue] [varchar](100) NOT NULL,
[Value] [varchar](100) NULL,
[OptionOrder] [tinyint] NULL,
--these could be associated with lists or options, wasn't specified
[AssociatedDept] [int] NULL,
[Other2] [nchar](10) NULL,
[Other3] [nchar](10) NULL
) ON [PRIMARY]
与
select Options.* --or a subset
from Options as o
join Lists as l
on l.ListId=o.ListId and l.ListName = 'nameOfList'
order by o.OptionOrder
获取内容(可能:取决于数据)更优化(尤其是如果一个选项出现在多个列表)
CREATE TABLE [dbo].[Lists](
[ListId] [int] IDENTITY(1,1) NOT NULL,
[ListName] [varchar](100) NOT NULL,
--these could be associated with lists or options, wasn't specified
[AssociatedDept] [int] NULL,
[Other2] [nchar](10) NULL,
[Other3] [nchar](10) NULL
) ON [PRIMARY]
CREATE TABLE [dbo].[Options](
[OptionId] [int] IDENTITY(1,1) NOT NULL,
[DisplayValue] [varchar](100) NOT NULL,
[Value] [varchar](100) NULL,
--these could be associated with lists or options, wasn't specified
[AssociatedDept] [int] NULL,
[Other2] [nchar](10) NULL,
[Other3] [nchar](10) NULL
) ON [PRIMARY]
CREATE TABLE [dbo].[ListOptions](
[OptionId] [int] NOT NULL,
[ListId] [int] NOT NULL,
[OptionOrder] [tinyint] NULL,
--these could be associated with lists or options, wasn't specified
[AssociatedDept] [int] NULL,
[Other2] [nchar](10) NULL,
[Other3] [nchar](10) NULL
)
获取内容
select Options.* --or a subset
from Options as o
join ListOptions as lo
on lo.OptionId=o.OptionId
join Lists as l
on l.ListId=lo.ListId and l.ListName = 'nameOfList'
order by lo.OptionOrder
无论如何,你都想索引外键列。
这种方法的最大缺点是它使得从其他表中有意义的外键很难到达你的'OptionTable'。 – 2012-02-08 21:36:34
@EricPetroelje - 是的,我已经看到了这一点。在查询中,我必须将表连接到自身以获取实际值(而不是键)。 – MAW74656 2012-02-08 21:48:09
http://stackoverflow.com/q/8839026/456532是一个回答较少的类似问题。 – MAW74656 2012-02-08 22:07:57