mysql如果string为空则使用默认值

Question

我有以下查询，所有''都显示为空字符串

INSERT INTO `locations` ( `house`,`house_number`,`road`,`city`,`state`,`country`,`country_code`,`supermarket`,`county`,`place_of_worship`,`city_district`,`suburb`,`neighbourhood`,`pedestrian`,`postcode`) 
VALUES ('','','','Gemeinde Wien','Vienna','Austria','at','','W','Saint Stephen\'s cathedral','Innere Stadt','Innere Stadt','Textilviertel','Stephansplatz','1010');

表格结构

所有字段的默认值均为null。

问题

所以问题是，我怎样才能得到空字符串保持其默认值？

Answer 1

您可以只使用null

，而不是插入''

INSERT INTO`locations`(`house`,`house_number`,`road`,`city`,`state`,`country`,`country_code`,`supermarket`,`county`,`place_of_worship`,`city_district`,`suburb`,`neighbourhood`,`pedestrian`,`postcode`) 
VALUES (null,null,null,'Gemeinde Wien','Vienna','Austria','at','','W','Saint Stephen\'s cathedral','Innere Stadt','Innere Stadt','Textilviertel','Stephansplatz','1010');

或者不要插入像这样的东西

INSERT INTO `locations` (`city`,`state`,`country`,`country_code`,`supermarket`,`county`,`place_of_worship`,`city_district`,`suburb`,`neighbourhood`,`pedestrian`,`postcode`) 
VALUES ('Gemeinde Wien','Vienna','Austria','at','','W','Saint Stephen\'s cathedral','Innere Stadt','Innere Stadt','Textilviertel','Stephansplatz','1010');