-- PostgreSQL V9.04
create table managecard (
id serial,
managecard char(18) not null
);
insert into managecard(managecard) values ('207999900100000020');
insert into managecard(managecard) values ('207999900100000021');
insert into managecard(managecard) values ('207999900100000022');
create table trans (
id serial,
card char(18) not NULl,
transtype char(10) not null,
transtime char(6)
);
insert into trans (card, transtype, transtime ) values ('207999900100000026', '消费', '050000');
insert into trans (card, transtype, transtime ) values ('207999900100000020', '消费', '050100');
insert into trans (card, transtype, transtime ) values ('207999900100000023', '存款', '050200');
insert into trans (card, transtype, transtime ) values ('207999900100000024', '积分消费', '050300');
insert into trans (card, transtype, transtime ) values ('207999900100000022', '启用', '050400');
insert into trans (card, transtype, transtime ) values ('207999900100000026', '消费', '050500');
insert into trans (card, transtype, transtime ) values ('207999900100000023', '积分消费', '050600');
insert into trans (card, transtype, transtime ) values ('207999900100000021', '消费', '050700');
insert into trans (card, transtype, transtime ) values ('207999900100000020', '积分消费', '050800');
insert into trans (card, transtype, transtime ) values ('207999900100000021', '消费', '050900');
insert into trans (card, transtype, transtime ) values ('207999900100000023', '启用', '051000');
/*
过程：
从trans表第一条记录a开始，如果a的卡号在managecard表中存在，则此条数据其后
的各条数据的卡号都记录在a的卡号旗下，直到遇到下一条卡号在managecard中存在的记录b
ｂ记录其后的各条数据的卡号都记录在b的卡号旗下，直到遇到下一条卡号在managecard中存在的数据记录c...，
如此往复。
根据以上数据及需求得出的结果应该是:
managecard card transtype transtime
-------------------------------------------------------------------
207999900100000020 207999900100000023 存款 050200
207999900100000020 207999900100000024 积分消费 050300
207999900100000022 207999900100000026 消费 050500
207999900100000022 207999900100000023 积分消费 050600
207999900100000021 207999900100000023 启用 051000
*/
小弟不才，能想到的办法只能是一条条检查记录，但是数据量大时肯定不是一个好方法，所以请问有没有更好的办法？
