mysql
例mysql> select CONCAT('My', 'S', 'QL');
sqlserver
select name+'aa' from student;
oracle
select 'aa'||'bb' from student;
2023-08-17 10:21:58
mysql
例mysql> select CONCAT('My', 'S', 'QL');
sqlserver
select name+'aa' from student;
oracle
select 'aa'||'bb' from student;