基于其他位列的计算列位

Question

从其他位列计算位列的公式是什么？

例如：

CREATE TABLE #Employee
(
[empNumb]       [INT] identity(1,1) PRIMARY KEY,
[IsOk]          [BIT] NOT NULL, -- This is computed from other three columns.
[HasValidHours] [BIT] NOT NULL,
[NoDemerits]    [BIT] NOT NULL,
[NoAccidents]   [BIT] NOT NULL
);

ALTER TABLE #Employee ADD CONSTRAINT [DF_Employee_HasValidHours]  
  DEFAULT ((0)) FOR [HasValidHours];
ALTER TABLE #Employee ADD CONSTRAINT [DF_Employee_NoDemerits]  
  DEFAULT ((0)) FOR [NoDemerits];
ALTER TABLE #Employee ADD CONSTRAINT [DF_Employee_NoAccidents]  
  DEFAULT ((0)) FOR [NoAccidents];

IsOk将根据,和的和-ing计算。HasValidHoursNoDemeritsNoAccidents

Answer 1

你的意思是 IsOk = 1 如果其他三位列都 = 1 否则 IsOk = 0？

如果是这样的话： -

CREATE TABLE #Employee
(
[empNumb]       [INT] identity(1,1) PRIMARY KEY,
[IsOk]          AS [HasValidHours] & [NoDemerits] & [NoAccidents],
[HasValidHours] [BIT] NOT NULL,
[NoDemerits]    [BIT] NOT NULL,
[NoAccidents]   [BIT] NOT NULL
);

请参阅&（按位与）（Transact-SQL）