各位大神，小白请教SQL数据库问题，这题目应该怎么做？

Question

Answer 1

1 select dh from td_ls_1 where Id_hyk >0

3 delete dh from td_ls_1 a inner join td_ls_2 b on a.dh = b.dh where a.Ymd_rz = 20110529

4 select je_hs from td_ls_2 group by je_hs order by desc;
供参考