oracle - Would like to know more on dba_hist_sqlstat -


i'm using tables - dba_hist_sqlstat, dba_hist_snapshot , dba_hist_sqltext stats groups of similar sql statements on entire period of time since instance start up. found same sql_id belonging 2 different snapids (snapshots). 

+-------+---------+---------------+-------------+---------------+--------------+--------------+ |snap_id|dbid     |instance_number|sql_id       |plan_hash_value|optimizer_cost|optimizer_mode| +-------+---------+---------------+-------------+---------------+--------------+--------------+ |63618  |622294766|1              |0ps2wsx1rjv8q|2871982686     |4             |all_rows      | |63522  |622294766|1              |0ps2wsx1rjv8q|2871982686     |4             |all_rows      | +-------+---------+---------------+-------------+---------------+--------------+--------------+

so, "group sql_id" sufficient ? should group "sql_text" ? there better way ?

[update]

here query i've written far -

 select          dh_sql.sql_id,          dh_sql.plan_hash_value,          dh_sql.parsing_schema_name,          dh_sql.module,          trunc(dh_snap.end_interval_time) "date",          max(dh_sql.snap_id),          max(dh_sql.dbid),          sum(dh_sql.executions_delta),          .          .          .          .           dba_hist_sqlstat dh_sql,          dba_hist_snapshot dh_snap           dh_sql.snap_id = dh_snap.snap_id          , dh_snap.begin_interval_time > to_date(?, 'mm/dd/yyyy')          , dh_snap.begin_interval_time < to_date(?, 'mm/dd/yyyy') + 1          , dh_sql.executions_delta > 0          , dh_sql.module not null  group          dh_sql.sql_id,          dh_sql.plan_hash_value,          dh_sql.parsing_schema_name,          dh_sql.module,          trunc(dh_snap.end_interval_time)


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