V4MD: Return empty results in multiple tables

[X Y]

Hi All,
I've noticed this happening several times but usually
wrote a fix to get around the problem. I am doing a
query involving 6 tables and am getting a null
results. However, when I used viSQL with the exact
same query the correct result is returned. Any ideas
on what I might be doing wrong?

My second question: Is there a function that exports a
db query into a tab delimited file?

Thanks in advance

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