I'm going to post this, just to show it can be done, but HIGHLY SUGGEST, not do it through SQL. Should be done through the UI that's displaying to be more dynamic on your columns. Even then, I would design this differently.
-- create master table
DECLARE @MasterTable TABLE (
[MasterID] [int] IDENTITY (1, 1) NOT NULL ,
[Details] [varchar] (50) ,
[AdditionalField_1] [varchar] (50) ,
[AdditionalField_n] [varchar] (50)
)
-- create log table
DECLARE @LogTable TABLE (
[LogID] [int] IDENTITY (1, 1) NOT NULL ,
[MasterID] [int] NULL ,
[UserID] [varchar] (2) ,
[LogDate] [datetime] NULL ,
[LogText] [varchar] (50)
)
-- insert into master table
INSERT INTO @MasterTable (Details)
VALUES ('First')
INSERT INTO @MasterTable (Details)
VALUES ('Second')
-- insert into log table
INSERT INTO @LogTable (MasterID, UserID, LogDate, LogText)
VALUES (1, 'AB', '05/11/2012', 'Called Client')
INSERT INTO @LogTable (MasterID, UserID, LogDate, LogText)
VALUES (2, 'AB', '05/11/2012', 'Called Client')
INSERT INTO @LogTable (MasterID, UserID, LogDate, LogText)
VALUES (2, 'CD', '07/11/2012', 'Called Client')
INSERT INTO @LogTable (MasterID, UserID, LogDate, LogText)
VALUES (2, 'CD', '08/11/2012', 'Client Visit')
-- create table to display data
DECLARE @MyTemp TABLE (MasterID INT, Details VARCHAR(50), LogData1 VARCHAR(50), LogData2 VARCHAR(50), LogData3 VARCHAR(50))
INSERT INTO @MyTemp SELECT MasterID, Details, NULL, NULL, NULL FROM @MasterTable
-- create vars
DECLARE @ID INT, @NewID INT, @MasterID INT, @NewValue VARCHAR(100)
SET @ID = 0
-- loop through data
WHILE @ID >-1
BEGIN
-- clear vars
SELECT @NewID = NULL, @MasterID = NULL, @NewValue = NULL
-- get first record
SELECT TOP 1
@NewValue = CONVERT(VARCHAR(10), LogDate, 103)+ ' ' + UserID + ': ' + LogText
, @MasterID=MasterID
, @NewID=LogID
FROM @LogTable WHERE LogID>@ID
-- if no data, exit loop
IF @NewID IS NULL
BREAK
-- update record based on valuds in fields
UPDATE m
SET @ID = @NewID
, LogData1 = (CASE WHEN m.LogData1 IS NULL THEN @NewValue ELSE m.LogData1 END)
, LogData2 = (CASE WHEN m.LogData1 IS NOT NULL THEN
(CASE WHEN m.LogData2 IS NULL THEN @NewValue ELSE m.LogData2 END)
ELSE m.LogData2 END)
, LogData3 = (CASE WHEN m.LogData1 IS NOT NULL THEN
(CASE WHEN m.LogData2 IS NOT NULL THEN
(CASE WHEN m.LogData3 IS NULL THEN @NewValue ELSE m.LogData3 END)
ELSE m.LogData3 END)
ELSE m.LogData3 END)
FROM @MyTemp m
WHERE m.MasterID=@MasterID
END
--display all data
SELECT * FROM @MyTemp