List tables with recently modified records - sql

Question

I have a field namely Modified_Dt of type Datetime in all of my tables, to keep track of last modified date and time for a record.
Now, let's say I need to know which tables has records that has been modified recently(like today).
How do I write a query for that? How do I query multiple tables?
By the way, I am using MS SQL Server 2008 R2.

Answer 1

USE MASTER
GO
DECLARE #ObjectName NVARCHAR(255)
DECLARE TablesList CURSOR
FOR select object_name(object_id, db_id('DBStackExchange'))
from [DBStackExchange].sys.columns
where name = 'Modified_Dt'
OPEN TablesList
FETCH NEXT FROM TablesList INTO #ObjectName
WHILE ##FETCH_STATUS = 0
BEGIN
exec
( 'If exists ( SELECT 1 FROM DBStackExchange.dbo.[' + #ObjectName
+ ']
Where convert(varchar(20),Modified_Dt,103)>=convert(varchar(20),getdate(),103))
Print ''' + #ObjectName + '''
'
)
FETCH NEXT FROM TablesList INTO #ObjectName
END
CLOSE TablesList
DEALLOCATE TablesList
Note: Replace 'DBStackExchange' with your Database name

Answer 2

declare #T table (T_Name nvarchar(255), M datetime)
declare #T_Name nvarchar(255), #SQLT nvarchar(max)
declare c cursor for select name from sys.tables
open c
fetch next from c into #T_Name
while ##fetch_status = 0 begin
set #SQLT = 'select top 1 ''' + #T_Name + ''', Modified_Dt from ' + #T_Name + ' order by Modified_Dt desc'
insert #T
exec sp_executesql #SQLT
fetch next from c into #T_Name
end
close c
deallocate c
select * from #T where M >= dateadd(day,datediff(day,0,getdate()),0)

Answer 3

Here is an answer without cursor or temporary table
DECLARE #ColumnName AS nvarchar(40) = 'Modified_Dt';
DECLARE #ModifiedSince AS datetime = '20140709';
DECLARE #sql AS nvarchar(max) = '';
-- Build a query with UNION ALL between all tables containing #ColumnName
WITH AllTables AS (
SELECT SCHEMA_NAME(Tables.schema_id) AS SchemaName
,Tables.name AS TableName
,Columns.name AS ColumnName
FROM sys.tables AS Tables
INNER JOIN sys.columns AS Columns
ON Tables.object_id = Columns.object_id
WHERE Columns.name = #ColumnName
)
SELECT #sql = #sql +
'UNION ALL SELECT ' + QUOTENAME(TableName, '''') +
', ' + QUOTENAME(ColumnName) +
' FROM ' + QUOTENAME(TableName) + CHAR(13)
FROM AllTables;
-- Create a query which selects last change from all tables
SET #sql =
'WITH AllChanges(TableName, ModifiedTime) AS ( ' +
STUFF(#sql, 1, LEN('UNION ALL'), '') + -- Remove first UNION
') ' +
'SELECT TableName ' +
' ,MAX(ModifiedTime) ' +
'FROM AllChanges ' +
'WHERE ModifiedTime > #ModifiedSince '
'GROUP BY TableName '
EXECUTE sp_executesql #sql, N'#ModifiedSince datetime', #ModifiedSince