SQL查询以传输THE SAME表的另一列上的所有记录

Question

Original Table Setup:

 Table Name: property_details
 Attribute: property_id, floor_area

Now, a new attribute is added named: total_area.

There are already records on property_details table with corresponding id and wanted to copy floor_area data to total_area . (Will do something floor_area later)

For clarification, if this is in excel I will copy the value of A1 to B2 on the same row. Pretty simple to demonstrate but can't figured out using sql.

Is this possible working on the same table?

Answer 1

Just run an UPDATE statement wherein the value of floor_area is copied to total_area , example,

UPDATE property_details
SET total_area= floor_area

Answer 2

更好的选择是将字段的名称从total_area更改为floor_area，这种情况下执行时间短且效率高，但是ID的ypur问题可能会更好，请先尝试采样或使用少量表