someone posted about sql lateral recently, which I had never heard of.
 Here is my first use of it.
There are 2 files. A header and a detail.  Header contains the BOL number.
 The detail contains the ship date of all the lines of that BOL. ( go
figure )
Here is the sql that shows the BOL and its ship date:
select a.w1BOL, b.w2sdte
from    w1mast a
, lateral ( select  c.w2sdte
            from    w2mast c
            where   a.w1wacd = c.w2wacd and a.w1sid = c.w2sid
                    and c.w2sdte <> 0
            fetch first row only ) b
where    a.w1wacd = 'LAE' and a.w1BOL <> ' '
I figure without lateral I have to do a join with group by and MIN(w2sdte)
to eliminate the multiple detail rows. But with lateral I can use "fetch
first row only" which is clearer to read since it does exactly what I want
to be done.
-Steve
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