여분필드에 관해서..explode 정보
여분필드에 관해서..explode
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현재 여분필드(wr_11....wr_39...)를 30개 넘게 쓰는데요.
여분필드를 더 늘려야 될 것 같은데..
더 늘리는게 나은지 아니면 한개의 필드에 넣고 explode 쓰는게 나은지
속도나 DB 부하등에서 어떤게 유리할까요?
여분필드를 더 늘려야 될 것 같은데..
더 늘리는게 나은지 아니면 한개의 필드에 넣고 explode 쓰는게 나은지
속도나 DB 부하등에서 어떤게 유리할까요?
( select a.* , ( select sum(co_count) as co_count from g4_qa_choose where mb_id=a.mb_id and bo_table = 'g4_qa' ) as q_co_count from `g4_write_g4_qa` a where wr_parent = '282062' and wr_8 != '' and wr_is_comment = 1 and CONVERT(wr_7, UNSIGNED) >= 5 group by wr_content having max(wr_7) order by CONVERT(wr_7, UNSIGNED) desc limit 3 )
1055 : Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'sir.a.wr_id' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by
error file : /15sir/bbs/board.php