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procedure queryLackLonOrLatTdCell(i_region_name varchar2, i_state varchar2) is begin select region_name, state from gc3_td_site_history where 1 = 1 and region_name = decode(i_region_name, null, region_name, i_region_name) and instr(decode(i_state, null, state, i_state), state) > 0; end;
如果i_region_name为null,则查询出所有的region_name;否则按i_region_name查询。
如果i_state为null,则查询所有的state;如果i_state为“state1,state2”,相当于state in(state1,state2);
sql条件为空查询全部,不为空按条件查询以及多条件筛选查询。
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原文地址:http://www.cnblogs.com/DurantSimpson/p/4588426.html