decode是很不錯的條件函數，但是它卻不能使用范圍來進行條件區分，而case則剛好彌補了這一缺點，以下是二者的例子比較： select pay_name,subgate,
sum(decode(floor(order_amount/10000),0,order_amount,0)) as? one_sum,
sum(decode(floor(order_amount/10000),0,1,0)) as one_count,
sum(decode(floor(order_amount/10000),1,order_amount,0)) as one_two_sum,
sum(decode(floor(order_amount/10000),1,1,0)) as one_two_count,
sum(decode(floor(order_amount/10000),2,order_amount,0)) as? two_three_sum,
sum(decode(floor(order_amount/10000),2,1,0)) as two_three_count,
sum(decode(floor(order_amount/10000),3,order_amount,4,order_amount,0)) as three_five_sum,
sum(decode(floor(order_amount/10000),3,1,4,1,0)) as three_five_count,
sum(decode(floor(order_amount/10000),5,order_amount,6,order_amount,7,order_amount,8,order_amount,9,order_amount,0)) as five_ten_sum,
sum(decode(floor(order_amount/10000),5,1,6,1,7,1,8,1,9,1,0)) as five_ten_count,
sum(decode(floor(order_amount/100000),0,0,order_amount)) as ten_sum,
sum(decode(floor(order_amount/100000),0,0,1)) as ten_count from order_tab
where order_date>=to_date('20061201','yyyymmdd')
and order_date<to_date('20070201','yyyymmdd')
and order_status=30
and lower(pay_name) in ('chinapay','cbj','abc','icbc','cbc','cmb')
group by pay_name,subgate
order by pay_name,subgate; select sum(case when count_01 <=10 then 1 else 0 end) as le10,
sum(case when count_01 >10 and count_01 <=20 then 1 else 0 end) as le20,
sum(case when count_01 >20 and count_01 <=50 then 1 else 0 end) as le50,
sum(case when count_01 >50 and count_01 <=100 then 1 else 0 end) as le100,
sum(case when count_01 >100 and count_01 <=200 then 1 else 0 end) as le200,
sum(case when count_01 >200 and count_01 <=500 then 1 else 0 end) as le500,
sum(case when count_01 >500 and count_01 <=1000 then 1 else 0 end) as le1000,
sum(case when count_01 >1000 then 1 else 0 end) as g1000
from (select ssn,sum(t.changepoints + t.fpoints) count_01
?from pay_detail_new_200701 t
?where serviceip not in ('charge','ptransfer')
?group by t.ssn); 感謝lisa提供的case例子！

轉載于:https://blog.51cto.com/zhaizhenxing/134840

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