Create table that contains table_name and max_date of each table - sql

Question

I have a table with only one column -Table_Name, that contains all table names in the database.
How can I create a process that will create another table with all of the names from the table above (Table_Name) and a second column with the max update date (Max_Update_Date) of each table ?
**Need to pull the value out from the column Update_Date from the tables themselves
Here is what I got so far -
DROP TABLE IF EXISTS #TempTable
select row_number()over (order by a.Table_Name) as rn, a.Table_Name, s.modify_date
into #TempMasterTable
from API_Tables a left join sys.tables s
on s.name=a.Table_Name
select * from #TempTable
declare #counter int,
#table nvarchar(50);
set #counter=(select top 1 rn from #TempTable order by rn desc)
while #counter>0
begin
set #table=( select table_name
from #TempTable
where #counter=rn);
update #TempTable
set modify_date=(select max([update_date]) from #table)
set #counter=#counter-1;
end

Answer 1

You can't directly use a table name from parameter in update statement. need to use the dynamic SQL. I have modified based on your requirement
DECLARE
#id INT
,#tablename VARCHAR(200)
,#TSQL NVARCHAR(MAX)
DROP TABLE IF EXISTS #TempMasterTable
SELECT ROW_NUMBER() OVER (ORDER BY Table_Name) AS Id
,Table_Name AS TableName
,ST.modify_date
INTO #TempMasterTable
FROM API_Tables APT
LEFT JOIN sys.tables ST
ON ST.name = APT.Table_Name
DECLARE tablename_cursor CURSOR FOR
SELECT Id,TableName
FROM #TempMasterTable
OPEN tablename_cursor
FETCH NEXT FROM tablename_cursor INTO #id,#tablename
WHILE ##FETCH_STATUS = 0
BEGIN
SET #TSQL = 'UPDATE #TempMasterTable SET modify_date = (SELECT MAX([update_date]) FROM '+#tablename+') WHERE Id ='+#id
EXEC( #TSQL)
FETCH NEXT FROM tablename_cursor INTO #id,#tablename
END
CLOSE tablename_cursor
DEALLOCATE tablename_cursor