What is a simple and efficient way to find rows with time-interval overlaps in SQL? -

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i have 2 tables, both start time , end time fields. need find, each row in first table, of rows in second table time intervals intersect.

for example:

           <-----row 1 interval-------> <---find this--> <--and this--> <--and this-->

please phrase answer in form of sql where-clause, , consider case end time in second table may null.

target platform sql server 2005, solutions other platforms may of interest also.

select *  table1,table2  table2.start <= table1.end  , (table2.end null or table2.end >= table1.start)

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