sql - 如何组合两个数据列？

Question

我有这个 SQL 语句我想结合 'date' 和 'dayOfWeek' 列

 SELECT CONVERT(date,startTimeStamp) AS DATE
      , datename(dw,CONVERT(date,startTimeStamp)) as dayOfWeek
      ,CONVERT(time,[startTimeStamp])AS StartTime
      ,CONVERT(time,[endTimeStamp])AS EndTime
      ,DATEDIFF(HH,[startTimeStamp] ,[endTimeStamp])
  FROM [TaskManagementSystem_DB].[dbo].[Timesheet_entry]

Answer 1

听起来你想要这个：

SELECT CONVERT(date,startTimeStamp) AS DATE
      , datename(dw,CONVERT(date,startTimeStamp)) as dayOfWeek
      ,cast(datename(dw,CONVERT(date, startTimeStamp)) as varchar(50)) -- add this
        + ' ' +                                                     -- add this
        CONVERT(varchar(50),CONVERT(date,startTimeStamp)) FullDate -- add this
      ,CONVERT(time,[startTimeStamp])AS StartTime
      ,CONVERT(time,[endTimeStamp])AS EndTime
      ,DATEDIFF(HH,[startTimeStamp] ,[endTimeStamp])
  FROM [TaskManagementSystem_DB].[dbo].[Timesheet_entry]

要将字段连接在一起，您必须cast()将它们连接到相同的数据类型，类似于：

select cast(datename(dw,CONVERT(date, getdate())) as varchar(50)) 
  + ' ' +
  CONVERT(varchar(50) ,getdate()) newdate

见SQL Fiddle with Demo