TSQL在Haystack中查找Needle

Question

例如我有數據庫A，並且我知道在其中一個表中的某個地方是值爲C的字段B，但是我不知道該字段名稱和表格。

問題：在哪個表格和字段中檢測（？）的最快方法是C值？

Answer 1

我很久以前寫這個劇本，它一直是逆向工程

set nocount off 

declare @searchvalue varchar(100) 
set @searchvalue = 'text to find' 


create table #tt (table_name varchar(64), column_name varchar(64), count int) 
select * into #t from 
(
select 'select ''' + a.table_name + ''' ''table_name'',''' + a.column_name + ''' ''column_name'', count(*) count from [' + a.table_name +'] where [' +a.column_name+']='''+@searchvalue +'''' + ' group by ['+ a.column_name+']' sqlstring 
from INFORMATION_SCHEMA.COLUMNS a 
join 
INFORMATION_SCHEMA.TABLES b 
on a.table_name = b.table_name 
and b.table_type = 'base table' 
where data_type like '%char' 
) a 

--loop cursor 
Declare @sqlstring as nvarchar(500) 
Declare SqlCursor CURSOR FAST_FORWARD FOR 
SELECT sqlstring FROM #t 
OPEN SqlCursor 
FETCH NEXT FROM SqlCursor 
INTO @sqlstring 
WHILE @@FETCH_STATUS = 0 
BEGIN 
     -- do row specific stuff here 
insert #tt 
exec(@sqlstring) 
    FETCH NEXT FROM SqlCursor 
    INTO @sqlstring 
END 
CLOSE SqlCursor 
DEALLOCATE SqlCursor 
select * from #tt 
drop table #tt 
drop table #t