SQL の変更点   


* postgres [#e092ed8c]
** select [#pbce5c5e]
 select * from [table] where [colomn] is null;
 select * from [table] where [colomn] is not null;
 select * from [table] where [colomn] like '%hoge%';
 select * from [table] where [colomn] not like '%hoge%';

** 重複削除 [#df759b04]
 delete from 【TABLE】 where 【ID】 in 
   (select 【ID】 
    from   【TABLE】 S1 
    where  【ID】< (select MAX(【ID】) from 【table】 as S2 where 
      S1.key1=S2.key1 and S1.key2=S2.key2 ..... ) ) ;


* psql 編 [#s35635dc]
*** psql [#pa3a5376]
 psql [-h 【hostname】] -d 【dbname】

*** backup [#n8e33415]
 pg_dump 【dbname】 > dbname.dump

*** 復活 [#pce621dd]
 psql -d 【dbname】 -f dbname.dump


*** 重複検索 [#l38dd420]
 select min(id) from item where type=100 group by time,geom having count(*) > 1
 select min(id) from item group by time having count(*) > 1