请问一下 这些语句到底在干什么?????SELECT t.*, f.name FROM cdb_threads

# Query_time: 2  Lock_time: 0  Rows_sent: 1646        Rows_examined: 241050

(SELECT t.*, f.name FROM cdb_threads t LEFT JOIN cdb_forums f ON f.fid =
t.fid WHERE t.fid='522' ORDER BY t.dateline DESC LIMIT 5) UNION (SELECT
t.*, f.name FROM cdb_threads t LEFT JOIN cdb_forums f ON f.fid = t.fid
WHERE t.fid='305' ORDER BY t.dateline DESC LIMIT 5) UNION (SELECT t.*,
f.name FROM cdb_threads t LEFT JOIN cdb_forums f ON f.fid = t.fid WHERE
t.fid='527' ORDER BY t.dateline DESC LIMIT 5) UNION (SELECT t.*, f.name
FROM cdb_threads t LEFT JOIN cdb_forums f ON f.fid = t.fid WHERE
t.fid='523' ORDER BY t.dateline DESC LIMIT 5) UNION (SELECT t.*, f.name
FROM cdb_threads t LEFT JOIN cdb_forums f ON f.fid = t.fid WHERE
t.fid='524' ORDER BY t.dateline DESC LIMIT 5) UNION (SELECT t.*, f.name
FROM cdb_threads t LEFT JOIN cdb_forums f ON f.fid = t.fid WHERE
t.fid='525' ORDER BY t.dateline DESC LIMIT 5) UNION (SELECT t.*, f.name
FROM cdb_threads t LEFT JOIN cdb_forums f ON f.fid = t.fid WHERE
t.fid='526' ORDER BY t.dateline DESC LIMIT 5) UNION (SELECT t.*, f.name
FROM cdb_threads t LEFT JOIN cdb_forums f ON f.fid = t.fid WHERE
t.fid='46' ORDER BY t.dateline DESC LIMIT 5) UNION (SELECT t.*, f.name
FROM cdb_threads t LEFT JOIN cdb_forums f ON f.fid = t.fid WHERE
t.fid='48' ORDER BY t.dateline DESC LIMIT 5) UNION (SELECT t.*, f.name

[ 本帖最后由 chnsbs 于 2008-5-10 10:46 编辑 ]

谁知道啊 说一下啊 在线等

有知道的请说一下啊 怎么回事情啊

有知道的告诉一下啊 急

解决了吗？
我的是

Discuz! info: MySQL Query Error

Time: 2008-5-19 4:12am
Script: /bbs/index.php

SQL: SELECT t.*, f.name FROM [Table]threads t, [Table]forums f WHERE t.fid<>'0' AND f.fid=t.fid AND f.fid not in (0,47) AND t.displayorder not in (-1,-2) ORDER BY t.dateline DESC LIMIT 0, 10
Error: Error writing file 'C:\WINDOWS\TEMP\MY12160' (Errcode: 28)
Errno.: 3

请检查'C:\WINDOWS\TEMP\文件夹是否已满

请贴出完整的错误提示