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±íinfoµÄ»ù±¾½á¹¹ºÍÊý¾ÝÈçÏ£¬ÆäÖÐsid£¨Ð¡ÀࣩºÍbid£¨´óÀࣩÓдÓÊô¹ØÏµ£¬¼´sidÏàͬµÄbid±Ø¶¨Ïàͬ
      ID    CONTENT  BID    SID
-----------------------------------
1 1 ÄÚÈÝ1 1 1
2 2 ÄÚÈÝ2 1 1
3 3 ÄÚÈÝ3 1 2
4 4 ÄÚÈÝ4 2 3
5 5 ÄÚÈÝ5 1 4
6 6 ÄÚÈÝ6 2 3
7 7 ÄÚÈÝ7 2 5

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      ID    CONTENT  BID    SID
-----------------------------------
1 1 ÄÚÈÝ1 1 1
2 3 ÄÚÈÝ3 1 2
3 5 ÄÚÈÝ5 1 4
4 4 ÄÚÈÝ4 2 3
5 7 ÄÚÈÝ7 2 5

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SQL code:
create table info(id varchar(5), content varchar(100), bid varchar(5), sid varchar(5));
insert into info values('1', 'ÄÚÈÝ1', '1', '1');
insert into info values('2', 'ÄÚÈÝ2', '1', '1');
insert into info values('3', 'ÄÚÈÝ3', '1', '2');
insert into info values('4', 'ÄÚÈÝ4', '2', '3');
insert into info values('5', 'ÄÚÈÝ5', '1', '4');
insert into info values('6', 'ÄÚÈÝ6', '2', '3');
insert into info values('7', 'ÄÚÈÝ7', '2', '5');





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