从每一行的另一列中减去一列的内容

Question

I have a big MySQL table and I want to change the Description column.

I want to delete the beginning of the every cell in each row that matches the value in the Name column, while the rest of the cell remains the same.

Please help.

Answer 1

You could use update whete the locate for the name in desciption is 1 (at the begin of the description)

update my_table
set description = substr( description, length(name)+1)
where locate(description, name ) = 1

Answer 2

REPLACE is your friend.

use this to see the changes:

SELECT TRIM(REPLACE(Deescription,`name`,'')) as newField from youtTableName;

update your table

UPDATE youtTableName
SET `Deescription` =  TRIM(REPLACE(Deescription,`name`,''))
;