Re: SQL query

Huascar Espinoza wrote:
>
> How can I get the following statistics in singles SQL queries:
>
> Table has a sequencing number field (NRO_CORREL) and a date field =
> (DATE_REF). Example (ORDER BY DATE_REF):
>
> NRO_CORREL DATE_REF
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
> =3D=3D=3D=3D=3D=3D=3D=3D
> 1 date1
> 2 date2
> 3 date3
> 5 date4
> 6 date5
> 4 date6
> 8 date7
> 9 date8
>
> I need to find:
>
> 1) Qty. and list of regs. with lacked NRO_CORREL in the sequence
> 2) Qty. and list of regs. With disordered NRO_CORREL
>
> Thank you!
>
> Hu=E1scar
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Huascar,

   Have a look at the lag() and lead() analytical functions. Order by date in the window attribute of the function, and compare NRO_CORREL to lag(NRO_CORREL).

-- 
Regards,

Stephane Faroult
Oriole Software
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