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select d.code,d.name, sum(w.weight) weight,round(avg(w.price),2) price,sum(w.money) money
from weight_info w left outer join t_dict d on w.productcode=d.code left outer join t_balancecode b on w.balancecode=b.balancecode where 1=1 and w.operdate>TO_TIMESTAMP('2009-11-2 04:12:32.0', 'yyyy-mm-dd hh24:mi:ssxff') group by d.code ,d.name
select to_char(trunc(w.operdate,'mm'),'yyYY'), sum(w.weight),avg(w.price),sum(w.money)
from weight_info w left outer join t_dict d on w.productcode=d.code left outer join t_balancecode b on w.balancecode=b.balancecode
where 1=1 and d.code='100' and w.operdate>TO_TIMESTAMP('2009-11-2 04:12:32.0', 'yyyy-mm-dd hh24:mi:ssxff') group by d.name,trunc(w.operdate,'mm') ;
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About parent vs child latches. There is no fundamental low level difference between parent and child latches, they are all small regions of memory modified with atomic test-and-set style opcodes.
You see parent (and solitary) latches from x$ksll ......
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