分析函数一例

select z.a,z.b,z.c from (select lag(t.a,2)over(order by t.a) pp_val, lag(t.a,1)over(order by t.a) p_val, t.a, lead(t.a,1)over(order by t.a) n_val, lead(t.a,2)over(order by t.a) nn_val, t.b,t.c from test2 t) z where z.a = '1' and ((z.p_val = '1' and z.pp_val = '1') or (z.p_val = '1' and z.n_val = '1') or (z.n_val = '1' and z.nn_val = '1'));