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MySQLでよく検索してしまうコマンド

Last updated at Posted at 2019-06-01

個人的なメモ集ですが、宜しければどうぞ。
間違っていたらごめんなさい。
随時追加しつつ、見なくても打てるようになったらいいなあ。

SQL

//user_t,gaibu_t...テーブル名
//userID,itemNo...カラム名

//新規テーブル作成時のPRIMARY KEY(主キー)と外部キーの設定
CREATE TABLE user_t(userID int,itemNo int,
                    PRIMARY KEY(userID),//主キー設定
                    FOREIGN KEY(itemNo)//外部キー
                    REFERENCES gaibu_t(itemNo))//テーブルとカラム名

//PRIMARY KEY(主キー)の追加設定
ALTER TABLE user_t ADD PRIMARY KEY(userID);

//AUTO_INCREMENTの追加設定
ALTER TABLE user_t CHANGE userID userID int AUTO_INCREMENT;

//テーブル名の変更
ALTER TABLE old_t RENAME TO new_t;

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