如何基于同一行中的其他列值更新mysql表列

Question

I have mysql table like this. 我有这样的mysql表。

table_categories - scid, scname, scimage

I want to update scimage field of each row to "/images/subcategories/"scid".png" 我想将每一行的scimage字段更新为“ /images/subcategories/"scid".png”

update table_categories set scimage = "/images/subcategories/" + <What should i write here, so it take scid value> + ".png"

Answer 1

Just write your column name like: 只需将您的列名称写为：

update table_categories set scimage = "/images/subcategories/" + scid + ".png"

If your column type is not varchar you must convert your datatype at the first . 如果您的列类型不是varchar，则必须首先转换数据类型。