创建一个按从另一个 table 导入的时间排序的过程？

Question

我正在尝试使用两个日期时间值对我的查询进行排序，但无法正常工作。它只是抱怨日期时间格式。

当我尝试执行以下命令时收到此错误消息

exec GetSingleAvailability @MachineID = 1002

Conversion failed when converting date and/or time from character string.

这是我的程序：

ALTER PROCEDURE [dbo].[GetSingleAvailability]
    -- Add the parameters for the stored procedure here
@MachineID int

AS
BEGIN
    -- SET NOCOUNT ON added to prevent extra result sets from
    -- interfering with SELECT statements.
    SET NOCOUNT ON;

    -- Insert statements for procedure here
    DECLARE @Availabilitytime datetime
    DECLARE @TimeNow datetime

    set @Availabilitytime = (SELECT Availabilitytime FROM dbo.machines Where MachineID = @MachineID)
    set @TimeNow = (SELECT GETDATE() AS time)
        DECLARE @query nvarchar(150)
        set @query = 'SELECT AVG(effectively) FROM ['+ Convert(nvarchar, @MachineID) +'] WHERE time between '+ @Availabilitytime +' and '+ @TimeNow +''
    EXECUTE sp_executesql @query 

END

Answer 1

您的程序可能需要稍微修改一下：

ALTER Proc GetSingleAvailability (@MachineID int) as
begin
    set nocount on
    declare @Availabilitytime datetime, @TimeNow datetime, @query nvarchar(150)

    select
          @Availabilitytime =
                (select AvailabilityTime from machines where MachineID = @MachineID)
        , @TimeNow = getDate()
        , @query = N'select avg(effectively) from '
                + quoteName(convert(nvarchar, @MachineID))
                + N' where [time] between '
                + quoteName(convert(nvarchar, @Availabilitytime, 120), nchar(39))
                + N' and '
                + quoteName(convert(nvarchar, @TimeNow, 120), nchar(39))

    execute sp_executesql @query
end

如果您只需要时间 (hh:mm:ss) 部分，请将 120 更改为 8。

Answer 2

找到了这样的解决方案：

    USE [MITestdb]
GO
/****** Object:  StoredProcedure [dbo].[GetSingleAvailability]    Script Date: 2020-09-11 20:10:47 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
-- =============================================
-- Author:      <Author,,Name>
-- Create date: <Create Date,,>
-- Description: <Description,,>
-- =============================================
ALTER PROCEDURE [dbo].[GetSingleAvailability]
    -- Add the parameters for the stored procedure here
@MachineID int

AS
BEGIN
    -- SET NOCOUNT ON added to prevent extra result sets from
    -- interfering with SELECT statements.
    SET NOCOUNT ON;

    -- Insert statements for procedure here
    DECLARE @Availabilitytime datetime
    DECLARE @TimeNow datetime

    set @Availabilitytime = (SELECT Availabilitytime FROM dbo.machines Where MachineID = @MachineID)
    set @TimeNow = (SELECT GETDATE())
        DECLARE @query nvarchar(150)
        set @query = 'SELECT AVG(effectively) FROM ['+ Convert(nvarchar, @MachineID) +'] WHERE time between @qAvailabilitytime and @qTimeNow'
    EXECUTE sp_executesql @query,
    N'@qAvailabilitytime datetime, @qTimeNow datetime', 
        @qAvailabilitytime = @Availabilitytime, @qTimeNow = @TimeNow

END

创建一个按从另一个 table 导入的时间排序的过程？

Create a procedure sorting by time imported from another table?

sql

sql-server

datetime

procedure