常用sql语句

时间：

select *
from mread.sup_operatelog a
where a.stepid = '040110'
and a.operatetime > to_date('20160525 13:09', 'yyyymmdd hh24:mi')
and a.operatetime < to_date('20160525 13:15', 'yyyymmdd hh24:mi')
order by operatetime desc

instr (sourceString,destString,start,appearPosition)
instr（'源字符串' , '目标字符串' ,'开始位置','第几次出现'）

substr ( string, start_position, [ length ] )
substr ('目标字符串',开始位置,长度)

REPLACE(str,from_str,to_str)
———— to_str 不写表示空、null

例子

select replace(substr(a.operateobject,
1,
instr(a.operateobject, '|', 1, 1) - 1),
'书ID:') bookid,
replace(substr(a.operateobject,
instr(a.operateobject, '|', 1, 4),
instr(a.operateobject, '|', 1, 5) -
instr(a.operateobject, '|', 1, 4) - 1),
'|章节ID:') mcpchapterid,
replace(substr(a.operateobject,
instr(a.operateobject, '|', 1, 6),
instr(a.operateobject, '|', 1, 7) -
instr(a.operateobject, '|', 1, 6) - 1),
'|请求时间:') reqtime
from mread.sup_operatelog a
where a.stepid = '040110'
and a.operatetime > to_date('20160520 3:09', 'yyyymmdd hh24:mi')
and a.operatetime < to_date('20160520 13:15', 'yyyymmdd hh24:mi')
and substr(a.operateobject,
instr(a.operateobject, '|', 1, 10) + 1,
instr(a.operateobject, '|', 1, 11) -
instr(a.operateobject, '|', 1, 10) - 1) = '处理结果返回码:0'

case

select case
when a.operatetime < to_date('20160525 13:10', 'yyyymmdd hh24:mi') then
1
else
2
end,
count(*)
from mread.sup_operatelog a
where a.operatetime > to_date('20160525 13:09', 'yyyymmdd hh24:mi')
and a.operatetime < to_date('20160525 13:15', 'yyyymmdd hh24:mi')
group by case
when a.operatetime <
to_date('20160525 13:10', 'yyyymmdd hh24:mi') then
1
else
2
end

select case
when op_date <= 60 then
1
when op_date > 60 and op_date <= 120 then
2
when op_date > 120 and op_date <= 600 then
3
else
4
end,
count(*)
from cfgbk.gc0524_sup_operatelog
group by case
when op_date <= 60 then
1
when op_date > 60 and op_date <= 120 then
2
when op_date > 120 and op_date <= 600 then
3
else
4
end;

时间差 换算：

select trunc(sysdate, 'mi'),
a.implicitcreatetime,
(trunc(sysdate, 'mi') - a.implicitcreatetime) * 60 * 60 * 24 op_date
from cntdb.CON_T_BASECHAPTER a
where a.implicitcreatetime > to_date('20160526 16:09', 'yyyymmdd hh24:mi')
and a.implicitcreatetime < to_date('20160526 16:15', 'yyyymmdd hh24:mi')