improve

Author: digoal

201801/20180115_01.md

@@ -135,11 +135,15 @@ where
 
 a,b的新增数据持续写入a1,b1。   
 
-同时有两张a2,b2用于合并时的切换表。   
+需要注意的是，结构的一致性，并保持一致。   
 
 ![pic](20180115_01_pic_002.jpg)   
+  
+同时有两张a2,b2用于合并时的切换表。   
 
 ```   
+-- 结构务必保持一致，而且将来改动a,b结构的时候a1,b1,a2,b2也要保持一致。
+
 create table a1(like a);   
 create table b1(like b);   
    
@@ -192,7 +196,7 @@ insert into c (id, tb, info, crt_time)
 select a.id, b.tb, a.info, a.crt_time from    
   a   
 join    
-  (select tid, array_agg(row(b.tid, b.info, b.status, b.crt_time)::b order by status) as tb from b3 b group by tid) b    
+  (select tid, array_agg(row(b.*)::b order by status) as tb from b3 b group by tid) b    
 using (tid)   
 on conflict (id)   
 do update set