How to count number of records from multiple tables

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i have a query that get the data from multiple tables now i have to count the total number of records,i can get number of records by filling the table into DataTable object e.g dt.Rows.Count,but table contains 1 million records so it takes time to fill data.
Thanks in advance.

Posted 12-Jan-12 19:09pm

bilawal121

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Jaganathan Bantheswaran · Answer 1 · 2012-01-12T20:17:00

Solution 1

Hi,

Use @@ROWCOUNT in your select statement. like,

select @@ROWCOUNT,col1,col2..... from ... join.....

Posted 12-Jan-12 20:17pm

Jaganathan Bantheswaran

Updated 12-Jan-12 20:18pm

v2

Spopy · Answer 2 · 2012-01-12T23:52:00

Solution 2

USe new query for count the record

Select Count(*) From ...your select statment

In this way you will not have to wait the time to fill the datatable.
Of course this leads to a double select the database.

Posted 12-Jan-12 23:52pm

Spopy

bilawal121 · Answer 3 · 2012-01-13T20:43:00

Solution 3

I solved this problem by using CTE(Common Type Expressions)
first i create CTE name cte
like e.g:
string cte=";with mycte as(my statement that take data from multiple table)"
select count(*) from mycte;

note:CTE start with semicolon

Posted 13-Jan-12 20:43pm

bilawal121