Пример запроса sql для сверки значений из списка таблиц

ValFromTableList.sql

--Cursor Sample, declare for tables list
--Result select val from list of tables, with equal column names--
 
IF OBJECT_ID('tempdb..#connector1') IS NOT NULL DROP TABLE #connector1
IF OBJECT_ID('tempdb..#resulttable') IS NOT NULL DROP TABLE #resulttable

CREATE TABLE #connector1 (val int)
CREATE TABLE #resulttable (id int, val int)

DECLARE
@tablename VARCHAR(100),
@id int,
@query VARCHAR(100),
@maxval

DECLARE cname CURSOR LOCAL FOR
SELECT id, table_name FROM tables                       --select unique id with tablename from table list
OPEN cname
FETCH NEXT FROM cname
	INTO @id, @tablename                                --@id for #resulttable, @tablename for #connector
	WHILE @@FETCH_STATUS=0
	BEGIN
		SET @query ='SELECT max(val) from ' +@tablename --select each needed val from each table 
		INSERT INTO #connector1 		     --example to take vaL into vaR, cos 'exec' has some restricts:
		EXEC(@query)                                 -- insert one val from EXEC-query into 'dynamic-one-val-table' 
		SELECT top(1) @maxval = val from #connector1 --...and select val into @var from dynamic table for #resulttable :) 
		TRUNCATE TABLE #connector1                   --clear 'dynamic' table 
		INSERT INTO #resulttable 
		SELECT @id, @maxval 		--insert into result table two values, @id from tablenames, @maxval for this table
 	FETCH NEXT FROM cname
		INTO @id,@tablename
	END
CLOSE cname
DEALLOCATE cname

/*************************
Finaly, needed val with expand info:

SELECT r.val as values, t.table_name FROM tables as t
JOIN #resulttable as r on t.id=r.id

*************************/