前面五張表格，所以用 subquery 就算了
這只有一張表格用什麼 subquery...
SELECT *
FROM boards
WHERE board_name IN (1,2,3,4,5)
ORDER BY posttime
LIMIT 5
資料庫系統不支援 IN 的話，可以換成
WHERE board_name = 1 OR board_name = 2 OR ...
※ 引述《gargamel (Nerding)》之銘言：
: 抄的...XD
: select * from (
: (select * from boards
: where board_name = '1'
: order by posttime limit 5) union
: (select * from boards
: where board_name = '2'
: order by posttime limit 5) union
: (select * from boards
: where board_name = '3'
: order by posttime limit 5) union
: (select * from boards
: where board_name = '4'
: order by posttime limit 5) union
: (select * from boards
: where board_name = '5'
: order by posttime limit 5))
: order by posttime limit 5;
: 這樣?
: ※ 引述《pakker (找尋蔚藍天空)》之銘言：
: : select * from (
: : (select * from board1 order by posttime limit 5) union
: : (select * from board2 order by posttime limit 5) union
: : (select * from board3 order by posttime limit 5) union
: : (select * from board4 order by posttime limit 5) union
: : (select * from board5 order by posttime limit 5) union
: : ) AS U order by posttime limit 5;
: : 這樣?
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