SQL query

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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