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You now have a very clear view of all rooms at any given point in time. I can assure that if you try to maintain a status on the Room like your trigger you are in for a long battle. Here is a very basic rough sketch of what I would consider a better approach to maintaining the Occupied state of a room.create table My Customer( Customer ID int identity primary key, FName varchar(25), LName varchar(25))create table Reservations( Reservation ID int identity primary key, Customer ID int, Room ID int, Check In Date datetime, Depart Date datetime)create table My Rooms( Room Num int primary key, Num Beds int, Coffee Maker bit)Of course you would need to create foreign keys and such. It would certainly make the need for your trigger to go away. Cross Tabs and Pivots, Part 1 – Converting Rows to Columns Cross Tabs and Pivots, Part 2 - Dynamic Cross Tabs Understanding and Using APPLY (Part 1)Understanding and Using APPLY (Part 2)','165px');" onmouseover="Instant ASP_Open Menu Mouse Over('_ctl6_ctl Topic_ctl Panel Bar_ctl Topics Repeater__ctl10_sm Author Name','_ctl6_ctl Topic_ctl Panel Bar_ctl Topics Repeater__ctl10_sm Author Name_Simple Menu Div Layer','I think you are making this way too complicated by having denormalized information.

Honestly, triggers are something you really don't need (aside from auditing) all that often if the system is properly normalized._______________________________________________________________Need help? Read the article at for best practices on asking questions. The relationship between Customer and rooms like you are doing should use at a minimum three tables. it is not reservations that are made, people arrive and get a room (so every room has 1-3 Customers at a time) for a few days and we keep a Record of it (so far on the third table) ...

','165px');" onmouseover="Instant ASP_Open Menu Mouse Over('_ctl6_ctl Topic_ctl Panel Bar_ctl Topics Repeater__ctl8_sm Author Name','_ctl6_ctl Topic_ctl Panel Bar_ctl Topics Repeater__ctl8_sm Author Name_Simple Menu Div Layer','Hi, I'm already sorry (especially if Sean is answering again) ... a single Customer with a UNIQUE CU_ID is staying in a room (with a UNIQUE ROOM_ID, unfortunately for me, sometimes there are 2 or three CU_ID staying in the same Room ...

I am quite new to this whole posting stuff, but I am trying my best ... they usually check in at the same day though, so the Check In Date should be the same ...

Customer Rooms Reservations I agree with you and this is what we had ... when they check out the room is free and can be given to anyone else who arrives that day. He might decide to move to a different room whilst his stay, but then the Record would just have to be changed.

When they check in and the Room No is entered on the 'Customer'-Table I would like the Bit-Field 'Occupied' in the 'Rooms'-Table to be set to "TRUE". still working on that Constraint ;)','165px');" onmouseover="Instant ASP_Open Menu Mouse Over('_ctl6_ctl Topic_ctl Panel Bar_ctl Topics Repeater__ctl9_sm Author Name','_ctl6_ctl Topic_ctl Panel Bar_ctl Topics Repeater__ctl9_sm Author Name_Simple Menu Div Layer','LOL no worries.That part I got done with a Trigger (see below) ... If a User manually marks the "Occupied"-(Bit)Field for that Room-ID as "FALSE", then I would like to set the Depart Date on the Customer-Table for ANY Customer staying in that room at the MOMENT to Getdate(). You did a fine job posting pretty much everything needed here.Here's my tables, Trigger, and some test data: CREATE TABLE [dbo].[Rooms]( [Room_ID] [int] IDENTITY(1,1) NOT NULL, [Room_No] [nvarchar](50) NULL, [Occupied] [bit] NULL, [Check In Date] [int] NULL, CONSTRAINT [PK_Rooms] PRIMARY KEY CLUSTERED ( [Room_ID] ASC)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]) ON [PRIMARY]GOCREATE TABLE [dbo].[Customer]( [CU_ID] [int] IDENTITY(5000,1) NOT NULL, [Check In Date] [datetime] NULL, [Room No] [int] NOT NULL, [Nights_Booked] [int] NULL, [Depart Date] [datetime] NULL, CONSTRAINT [PK_Customer] PRIMARY KEY CLUSTERED ( [CU_ID] ASC)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]) ON [PRIMARY]GOALTER TABLE [dbo].[Customer] WITH CHECK ADD CONSTRAINT [FK_Customer_Rooms] FOREIGN KEY([Room No])REFERENCES [dbo].[Rooms] ([Room_ID])GOALTER TABLE [dbo].[Customer] CHECK CONSTRAINT [FK_Customer_Rooms]GO-- 2 Tables created including PK/FK Relationship SET IDENTITY_INSERT Rooms ONINSERT INTO Rooms(Room_ID, Room_No, Occupied) SELECT 1, 'A14', 0 UNION ALLSELECT 2, 'B2', 0 UNION ALLSELECT 3, 'C3', 0 UNION ALLSELECT 4, 'D8', 0 UNION ALLSELECT 5, 'K9', 0 SET IDENTITY_INSERT Rooms OFFGOSET IDENTITY_INSERT Customer ONINSERT INTO Customer(CU_ID, Check In Date, Room No, Nights_Booked, Depart Date) SELECT 5000, '2013-05-10', 1, 4, NULL UNION ALLSELECT 5001, '2013-05-10', 1, 4, NULL UNION ALLSELECT 5002, '2013-05-10', 2, 2, NULL UNION ALLSELECT 5003, '2013-05-10', 3, 3, NULL UNION ALLSELECT 5004, '2013-05-11', 4, 4, NULL UNION ALLSELECT 5005, '2013-05-11', 4, 4, NULL UNION ALLSELECT 5006, '2013-05-11', 4, 4, NULLSET IDENTITY_INSERT Customer OFF-- Test Data entered in rows on 'Rooms' and 'Customer'-Tables The Trigger works fine and it updates all the Records with the same Room_ID (Room No respectively on Customer Table). And I get SQL Server to enter the Depart-Date based on the Check-In-Date of the specific Customer, if I pass that one on to the Room-Table. I think you are making this way too complicated by having denormalized information.Unfortunately it only updates the Data with the 1st Entry made for that specific Room_ID on the Rooms-Table ... I struggle with the first part - how to pass the Check In Date on Insert and if a value is existing update it with the newer date ... The relationship between Customer and rooms like you are doing should use at a minimum three tables. This does not have a "status" and it is also independent of anything else.Occupied is marked as 'False', set the Check-Out-Date for all CU_ID with Customer. What you should do is capture the data, then you can easily determine the status when you need it. Now all you have to do is look at the Rooms table, join it to the Reservations table to make sure you have a room that will work.

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Assuming you find a room you create a new row in Reservations with the Customer ID and the Room Num along with the dates of the reservation.

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