Re: select with multiple occurences in same table

WIlliam,

> Table "inventorytrack"
> Attribute | Type | Modifier
> ------------+-----------+----------
> tattoo | text |
> past_group | text |
> ranch | text |
> ent_date | timestamp |
> indate | date |
>

Are you sure that you're using the most efficient data types for this
table? And where's your primary key?

> In the above table, I have multiple occurrences of ‘tattoo’.
> However, some
> of the tattoo’s have null value in ‘indate’, some do not. I would
> like to
> select those tattoos with a null indate, unless there is another
> identical
> tattoo in the table that has a date value in ‘indate’.

THis one is easy. However, I'm not sure exactly waht you want; the
sample return tuples you provided do not match what you asked for!

If you wanted to answer the question above:

SELECT * FROM inventorytrack
WHERE indate IS NULL
AND NOT EXISTS (
SELECT tattoo FROM inventorytrack it2
WHERE it2.tattoo = inventorytrack.tattoo
AND indate IS NOT NULL );

-Josh Berkus

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