2020-10-24から1日間の記事一覧
テーブルのコピー CREATE TABLE meats_tmp SELECT * FROM meats; NULL値を平均値に置き換える SELECT *, COALESCE( price, (SELECT SUM(price)/COUNT(*) FROM meats_tmp) ) AS price FROM meats_tmp; price=0ならNULLを返す SELECT NULLIF(price, 0) FROM me…
テーブルのコピー CREATE TABLE meats_tmp SELECT * FROM meats; NULL値を平均値に置き換える SELECT *, COALESCE( price, (SELECT SUM(price)/COUNT(*) FROM meats_tmp) ) AS price FROM meats_tmp; price=0ならNULLを返す SELECT NULLIF(price, 0) FROM me…