Can I use LEAD or LAG with Groups?

Question

Can I use LEAD or LAG with Groups?
I want to compare two records of each group.
Is it possible?
Thanks in advance

Answer 1

Xavi wrote:
I have this query:
SELECT a.cod_riesgo_txpk           as num_poliza,
a.cod_suplementor_txpk      as suplemento,
a.movimiento_nmpk           as movimiento,
a.cod_tipo_operacion_txfk   as tipo_operacion,
rc.fecha_vcto_cobertura_txd as fecha_vto,
rc.capital_asegurado_nm     as capital,
rc.prima_total_nm           as prima
FROM REGU_RIESGOS_COBERTURAS rc, REGU_MOVIMIENTOS_POLIZAS a
WHERE rc.cod_cobertura_txpkfk ='005'
AND rc.cod_riesgo_txpkfk = a.cod_riesgo_txpk
AND rc.cod_suplementor_txpkfk = a.cod_suplementor_txpk
AND rc.movimiento_nmpkfk = a.movimiento_nmpk
order by num_poliza, movimiento;
The results:
NUM_POLIZA     SUPLEMENTO     MOVIMIENTO     TIPO_OPERACION     FECHA_VTO     CAPITAL     PRIMA
0640080109141     0640080109141/014     1     02     01/05/2010     15025302,61     3,19
0640180096274     0640180096274/006     1     02     01/05/2006     1652783     1387,8
0640180365194     0640180365194/005     1     02     08/07/2006     150253     294,83
0640180369821     0640180369821/009     1     02     31/12/2006     13460000     28483,08
0640180369821     0640180369821/010     2     02     28/02/2007     13460000     29546,08
0640180384185     0640180384185/010     1     02     30/12/2006     36085241,96     113951,53Can yo see NUM_POLIZA 0640180369821     I have two records, then I want to compare two rows in each grou.What do you mean by compare? What do you want to do?
You can use the PARTITION BY clause if you want the analytic function to work within a specific group.