T-SQL Inner Join Query

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Hi,

I have two tables that I'm looking to reference between; one table holds 2000+ rows of datetimes with ID's and the second table holds just 400 -/+ datetimes.

I need to find all the datetime (dt_tbl1) in table 1 that are round about the same time as those in table 2, (table 2 is my reference point) producing a list of ID's from table 1 that are around the datetime (dt_tbl2) of table 2.

Basically finding the 400 -/+ ID's in table 1, also table 1 is 2 - 10 seconds behind table 2.

The column type IS datetime, not float, varchar or alike etc.

Hope you follow me so far.

Here's the query ;

SQL

SELECT * FROM @table2 as tbl2
inner join @table1 as tbl1 on tbl1.dt_tbl1 = tbl2.dt_tbl2

However I know the

SQL

tbl1.dt_tbl1 = tbl2.dt_tbl2

part will just look for exact matches, but I need it to find datestimes (dt_tblx) give or take 2 - 10 seconds.

Anyone know how I can elaborate the query to do this?

I'm guessing it would be something like

SQL

DATEDIFF(SS,tbl2.dt_tbl2,tbl1_dt_tbl1) <= 4

Thanks,
James

Posted 5-Jul-13 5:20am

J3ffers

Updated 5-Jul-13 5:25am

v2

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Stephen Hewison · Accepted Answer · 2013-07-05T05:27:00

Solution 1

Look at the BETWEEN command

SQL

t1.date BETWEEN DATEADD(second, 2, t2.date) AND DATEADD(second, 10, t2.date)

Or you can write multiple logic statement

SQL

t1.date > DATEADD(second, 2, t2.date) AND t1.date < DATEADD(second, 10, t2.date)

You can probably find a number of other ways too. You'll have to try them and see which is fasted.

The following article discusses these and more:

http://social.msdn.microsoft.com/Forums/sqlserver/en-US/33d56faf-7eed-455e-8d75-93d22291ae9a/allow-for-1-second-variance-in-datetime-join[^]

Posted 5-Jul-13 5:27am

Stephen Hewison

Comments

J3ffers 5-Jul-13 11:51am

Thanks Stephen,

I've change my code as follows;

Collapse | Copy Code
inner join @table1 as tbl1 on tbl1.dt_tbl1 BETWEEN DATEADD(second, 2, tbl2.dt_tbl2) AND DATEADD(second, 10, tbl2.dt_tbl2)
or
Collapse | Copy Code
inner join @table1 as tbl1 on tbl1.dt_tbl1 > DATEADD(second, 2, tbl2.dt_tbl2) AND tbl1.dt_tbl1 < DATEADD(second, 10, tbl2.dt_tbl2)

I'm getting 19 results on either query so getting there somewhat, just got to tweak the time frame differences.

Thank you very much.

Ta,
James

[no name] 5-Jul-13 11:59am

my 5..

Stephen Hewison 5-Jul-13 12:35pm

Thanks