<code>$res = DB::table('topics')->select('topics.*', 'b.username',
'b.avatar', 'c.username as rname', 'd.cname')
->where('topics.is_hidden', 0)
->leftJoin('users b', 'b.uid', '=', 'topics.uid')
->leftJoin('users c', 'c.uid', '=', 'topics.ruid')
->leftJoin('nodes d', 'd.node_id', '=', 'topics.node_id')
->orderBy('ord', 'desc')
->take($limit)->get();
</code>这里错误很多：
table 'startbbs.stb_users b' doesn't exist
stb_users 我要用到两次，肯定得取别名，怎么办呢
<code>$res = DB::table('topics')->select('topics.*', 'b.username',
'b.avatar', 'c.username as rname', 'd.cname')
->where('topics.is_hidden', 0)
->leftJoin('users b', 'b.uid', '=', 'topics.uid')
->leftJoin('users c', 'c.uid', '=', 'topics.ruid')
->leftJoin('nodes d', 'd.node_id', '=', 'topics.node_id')
->orderBy('ord', 'desc')
->take($limit)->get();
</code>这里错误很多：
table 'startbbs.stb_users b' doesn't exist
stb_users 我要用到两次，肯定得取别名，怎么办呢
<code class="php">$res = DB::table('topics')->select('topics.*', 'b.username',
'b.avatar', 'c.username as rname', 'd.cname')
->where('topics.is_hidden', 0)
->leftJoin('users AS b', 'b.uid', '=', 'topics.uid')
->leftJoin('users AS c', 'c.uid', '=', 'topics.ruid')
->leftJoin('nodes AS d', 'd.node_id', '=', 'topics.node_id')
->orderBy('ord', 'desc')
->take($limit)->get();</code>
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