Leonardo M. Ramé-2 wrote
> select lag.id, lag.idtask, lag.code, lag.lg from (select idtask, code, id,
> lag(code, -1) over () as lg from tasks_test) as lag
First you want to include an ORDER BY in the OVER(...) clause, and probably
a PARTITION BY as well.
Then you move that to a sub-query (for example):
SELECT *
FROM tbl
WHERE tbl.idtask IN (
SELECT lag.idtask FROM ( lag_query_here ) lag WHERE lag.code = 'T' and
lag.lg = 'S'
);
David J.
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