更新表SQL查询帮助

Question

I have a database student(attribute - studentid). studentid is a varchar. Now I want to add 'P' at the end of all studentids.

12 -> 12P 234 -> 234P

What will be the sql query for this?

Answer 1

UPDATE mytable
SET student_id = student_id + 'P'   --assumes already varchar 
WHERE RIGHT(student_id, 1) <> 'P'   --to stop having PP at end...

Answer 2

UPDATE mytable SET student_id=CONCAT(student_id,'P');//mysql

Answer 3

这适用于SQL Server：

select cast(Studentid as varchar) +'P' from student

Answer 4

update @t
set studentid = studentid + 'P'