小编gba*_*alu的帖子

I have one doubt in sql server. How to calculate car login and logout time details?

table: cardetails

Here need to calculate each car how many hours spend in parking area.

creatE TABLE [dbo].[CarDetails](
    [carid] [int] NULL,
    [DateTimeDetail] [datetime] NULL,
    [Flag] [varchar](50) NULL
) 
INSERT [dbo].[CarDetails] ([carid], [DateTimeDetail], [Flag]) VALUES (1, CAST(N'2019-01-20T19:05:00.000' AS DateTime), N'in')
GO
INSERT [dbo].[CarDetails] ([carid], [DateTimeDetail], [Flag]) VALUES (1, CAST(N'2019-01-20T22:30:00.000' AS DateTime), N'out')
GO
INSERT [dbo].[CarDetails] ([carid], [DateTimeDetail], [Flag]) VALUES (2, CAST(N'2019-01-20T20:30:10.000' AS DateTime), N'in')
GO …

我对SQL Server有一个疑问：如何获取男性和女性数据的备用数据

CREATE TABLE [dbo].[EmpGenders]
(
    [id] [INT] NULL,
    [Name] [VARCHAR](50) NULL,
    [Gender] [VARCHAR](50) NULL
) 

INSERT INTO [dbo].[EmpGenders] ([id], [Name], [Gender]) 
VALUES (1, N'Manish', N'Male'), (2, N'Nayak', N'Male'),
       (3, N'Martin', N'Male'), (4, N'Roy', N'Male'),
       (5, N'Hardik', N'Male'), (6, N'Manisha', N'Female'),
       (7, N'Kruti', N'Female'), (8, N'Maria', N'Female')

基于以上数据，我想要这样的输出：

Id | Name    | Gender 
---+---------+---------
1  | Manish  | Male
6  | Manisha | Female
2  | Nayak   | Male
7  | Kruti   | Female
3  | Martin  | Male
8 …