SqlConnection conn = new SqlConnection(SERP_FT_connection);
SqlCommand cmd = new SqlCommand("+ " LEFT JOIN [serp_m3_data] m3 ON m3.serp_post_id = sp.serp_post_id "] sp LEFT JOIN [serp_m3_data] m3 ON m3.serp_post_id = sp.<e
我有一个类似这样的表:您可以注意到,在serp_flag列中有许多值为null。我需要填写这些字段。它必须用以前的非空值填充。= 0 THEN 0 WHEN serp_flag is null then (select serp_flag from (selectt2.serp_flag,(t1.collector_tstamp - t2.collector_tstamp) as time_diff from temp.<