Question

I am trying to select a field from MySQL table and remove a substring from that field, and update that field.

For example: VAR1010 I want to replace and update VAR with SHS and the remaining part is the same. The result I am expecting is SHS1010

Here is the code:

SELECT SUBSTR(R.regnumber,4,4) as RegNo from registration R WHERE R.teacheremail='param';

UPDATE registration  SET regnumber = 'SHSRegNo' where teacheremail='param';

But it’s updating as RegNo.

Answer 1

You can do this in one UPDATE statement:

UPDATE registration  
SET regnumber = concat('SHS', substr(regnumber, 4, 4))
where teacheremail='param';

See SQL Fiddle with Demo