本课内容目前为英文。
Change and remove
arash finally picks a country, and sara wants to fix a post. UPDATE changes rows that already exist and DELETE removes them. Both are powerful, and both can wreck a whole table if one line goes missing.
本课内容目前为英文。
arash finally picks a country, and sara wants to fix a post. UPDATE changes rows that already exist and DELETE removes them. Both are powerful, and both can wreck a whole table if one line goes missing.