SQL Loop through all tables and get the max value from a specific column - sql

Question

I'm trying to create an audit table that checks the loaded date for that table.
Basically, I want to loop through all tables in the database and check for a specific column - LoadedDate and return the max value for that column for each table
SELECT TABLE_NAME
INTO #TableList
FROM INFORMATION_SCHEMA.COLUMNS
WHERE column_name = 'LoadedDate'
SELECT MAX(LoadedDate) FROM #TableName -- I guess using a cursor to loop through #TableList
in to a results table
TableName LoadedDate
Table 1 2016-06-01
Table 2 2016-07-01
Table 3 2016-06-01
and so on.

Answer 1

You can try this code, but it will consume some time
SELECT TABLE_NAME,TABLE_SCHEMA
INTO #TableList
FROM INFORMATION_SCHEMA.COLUMNS
WHERE column_name = 'LoadedDate'
CREATE TABLE #TempResult (TableName VARCHAR(100), MaxDate DATETIME2)
DECLARE #TableName VARCHAR(100)
,#TableSchema VARCHAR(100)
DECLARE #SqlQuery NVARCHAR(MAX)
WHILE(EXISTS(SELECT TOP(1) * FROM #TableList))
BEGIN
SELECT TOP(1) #TableName = TABLE_NAME, #TableSchema = TABLE_SCHEMA FROM #TableList
DELETE #TableList WHERE TABLE_NAME = #TableName
SET #TableName = #TableSchema +'.'+ #TableName
SET #SqlQuery = 'SELECT '''+#TableName+''' AS ''TableName'', MAX(UpdatedDate) AS MaxDate FROM '+ #TableName
INSERT INTO #TempResult
EXECUTE sp_executesql #SqlQuery
END
SELECT * from #TempResult
DROP TABLE #TableList
DROP TABLE #TempResult

Answer 2

Perhaps a little dynamic SQL
Select Table_Name = cast('' as varchar(150))
,LoadedDate = GetDate()
Into #TableList
Where 1=0
Declare #SQL varchar(max) = '>>>'
Select #SQL = #SQL + SQL
From (
Select Table_Name,SQL='Union All Select Table_Name='''+Table_Name+''',LoadedDate=max(LoadedDate) From ['+Table_Name+'] '
From INFORMATION_SCHEMA.COLUMNS
Where column_name Like '%UTC%' --= 'LoadedDate'
) A
Set #SQL = Replace(#SQL,'>>>Union All','Insert Into #TableList ')
Exec(#SQL)
Select * from #TempResult