sql - 计算列 - 需要帮助编写语句

Question

直到我今天需要设置一个计算列之前，我才听说过计算列，所以请原谅我的愚蠢。这是我的创建表语句

CREATE TABLE [Match](

    [Match Org] [nvarchar](10) NULL,
    [Bypass] [nvarchar](10) NULL,
    [win] as case when [Match Org] == 'yes' or [Bypass] == 'yes' then 'yes' else 'no'

) ON [PRIMARY]

GO

如果 match org 或 bypass 在其中有 yes，我希望 win 列自动计算为 yes...谢谢

Answer 1

CREATE TABLE [Match](

    [Match Org] [nvarchar](10) NULL,
    [Bypass] [nvarchar](10) NULL,
    [win] AS CASE WHEN  ( [Match Org] = 'yes'    --- equality check is:  =
                       OR [Bypass] = 'yes' )     --- not:  ==
                  THEN 'yes' 
                  ELSE 'no'
             END                                 --- END was missing
        PERSISTED             --- you may also want to make
                              --- the column PERSISTED 
) ON [PRIMARY]

Answer 2

CREATE TABLE [Match]( 

    [Match Org] [nvarchar](10) NULL, 
    [Bypass] [nvarchar](10) NULL, 
    [win] as case  when  [Match Org] = 'yes' or [Bypass] = 'yes' then 'yes' else 'no' end
)

GO 

Answer 3

你可以做的是

在表中创建列

[win]  AS ([dbo].[GetColValue]([Match Org],[Bypass ]))

您可以创建的功能

ALTER FUNCTION [dbo].[GetColValue](@MatchOrg nvarchar(10),@Bypass nvarchar(10))
RETURNS varchar(10)
AS
    BEGIN
        DECLARE @Result varchar(10)
        SET @Result = case 
                  when ([Match Org] = 'yes' or [Bypass] = 'yes' )
                  then 'yes' else 'no' 
                  end        
         RETURN 
        (
            @Result
        )
    END