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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