我需要在Boost 1.60.0或更高版本上使用带有-- assuming primary key in lookup table is a number
select subq.num,subq.matching_firstcode,
(select codename from codes ci where ci.firstcode = subq.matching_firstcode) codename
from (
select n.num,
greatest(
nvl(c8.firstcode,0),
nvl(c7.firstcode,0),
nvl(c6.firstcode,0),
nvl(c5.firstcode,0),
nvl(c4.firstcode,0),
nvl(c3.firstcode,0),
nvl(c2.firstcode,0),
nvl(c1.firstcode,0)
) matching_firstcode
from numbers n
left outer join codes c1 on c1.firstcode = to_number(substr(to_char(n.num), 1, 1))
left outer join codes c2 on c2.firstcode = to_number(substr(to_char(n.num), 1, 2))
left outer join codes c3 on c3.firstcode = to_number(substr(to_char(n.num), 1, 3))
left outer join codes c4 on c4.firstcode = to_number(substr(to_char(n.num), 1, 4))
left outer join codes c5 on c5.firstcode = to_number(substr(to_char(n.num), 1, 5))
left outer join codes c6 on c6.firstcode = to_number(substr(to_char(n.num), 1, 6))
left outer join codes c7 on c7.firstcode = to_number(substr(to_char(n.num), 1, 7))
left outer join codes c8 on c8.firstcode = to_number(substr(to_char(n.num), 1, 8))
) subq
;
的过滤器来设置logging::core。
有人有示例代码吗？