Algo como lo siguiente debería funcionar
DECLARE @C1 AS CURSOR,
@TABLE_SCHEMA SYSNAME,
@TABLE_NAME SYSNAME,
@HasCreated BIT,
@HasUpdated BIT,
@MaxDate DATETIME,
@MinDate DATETIME,
@SQL NVARCHAR(MAX)
SET @C1 = CURSOR FAST_FORWARD FOR
SELECT TABLE_SCHEMA,
TABLE_NAME,
COUNT(CASE
WHEN COLUMN_NAME = 'CREATED_DATETIME' THEN 1
END) AS HasCreated,
COUNT(CASE
WHEN COLUMN_NAME = 'UPDATED_DATETIME' THEN 1
END) AS HasUpdated
FROM INFORMATION_SCHEMA.COLUMNS
WHERE COLUMN_NAME IN ( 'CREATED_DATETIME', 'UPDATED_DATETIME' )
GROUP BY TABLE_SCHEMA,
TABLE_NAME
OPEN @C1;
FETCH NEXT FROM @C1 INTO @TABLE_SCHEMA , @TABLE_NAME , @HasCreated , @HasUpdated ;
WHILE @@FETCH_STATUS = 0
BEGIN
SET @SQL = N'
SELECT @MaxDate = MAX(D),
@MinDate = MIN(D)
FROM ' + QUOTENAME(@TABLE_SCHEMA) + '.' + QUOTENAME(@TABLE_NAME) + N'
CROSS APPLY (VALUES ' +
CASE WHEN @HasCreated = 1 THEN N'(CREATED_DATETIME),' ELSE '' END +
CASE WHEN @HasUpdated = 1 THEN N'(UPDATED_DATETIME),' ELSE '' END + N'
(@MaxDate),
(@MinDate)) V(D)
'
EXEC sp_executesql
@SQL,
N'@MaxDate datetime OUTPUT, @MinDate datetime OUTPUT',
@MaxDate = @MaxDate OUTPUT,
@MinDate = @MinDate OUTPUT
FETCH NEXT FROM @C1 INTO @TABLE_SCHEMA , @TABLE_NAME , @HasCreated , @HasUpdated ;
END
SELECT @MaxDate AS [@MaxDate], @MinDate AS [@MinDate]
