数据库设计：表结构

Question

I've excel form which contain macro that can pull data from SQL Server and display info on the excel form. Users can update the form and macro will write changed back to SQL Server.

This is the excel form. Users need to input the values for those highlighted on yellow color. Example John enter user field as 'JOHN' follow by region 'LATAM' , year '2016' and month '3'. Once it done, John would click an 'Retrieve' button to pull all data from SQL Server where Region = LATAM, Year=2016 and Month = 3. All the related info would display on field Area, Region, Mgmt, CompanyCode, AcctUnit, Account and Value (It could have multiple rows of records and users are not allow to edit these records). Now John need to input value for field Comments. Once he completed, John would click 'Save' button and excel macro would write comments value to SQL Server

Here the table structure that excel macro will read and write

CREATE TABLE [dbo].[Sales](
[Region] [varchar](10) NOT NULL,
[Area] [varchar](10) NOT NULL,
[Mgmt] [varchar](10) NOT NULL,
[CompanyCode] [int] NOT NULL,
[AcctUnit] [varchar](7) NOT NULL,
[Account] [varchar](10) NOT NULL,
[Comment] [varchar](100) NULL,
[Year] [int] NULL,
[Jan] [float] NULL,
[Feb] [float] NULL,
[Mar] [float] NULL,
[Apr] [float] NULL,
[May] [float] NULL,
[Jun] [float] NULL,
[Jul] [float] NULL,
[Aug] [float] NULL,
[Sep] [float] NULL,
[Oct] [float] NULL,
[Nov] [float] NULL,
[Dec] [float] NULL,
[SYS_CreatedBy] [varchar](15) DEFAULT SYSTEM_USER,
[SYS_CreatedDate] [datetime] DEFAULT GETDATE(),
[SYS_ModifiedBy] [varchar](15) DEFAULT SYSTEM_USER,
[SYS_ModifiedDate] [datetime] DEFAULT GETDATE(),
CONSTRAINT [PK_Sales] PRIMARY KEY NONCLUSTERED
    (
    Region ASC, 
    Area ASC, 
    Mgmt ASC,
    CompanyCode ASC,
    AcctUnit ASC,
    Account ASC,
    )
)

Based on above table structure, how can other users put his/her comments while it doesn't affected those comments that John already updated to SQL Server ? Example, John already input his comments and has been updated to SQL Server, now Alice pull same data from SQL Server where region = LATAM, Year = 2016 and Month = 3. She should get same data as John did except comments field, which in this case should be blank instead of John's comment.

Based on above table design, the comment's value will keep changing by different users. How to redesign table structure so comment can be unique to each users?

Answer 1

I would create a Comments table, and relate it to the Sales table through a foreign key.

To that end, I would add a surrogate key to the Sales table, so that you don't need to add all those PK columns to your Comments table.