select  a + ' '+b  as ab from tableName

如果是有整型的(例,b字段为int类型):

select a +' '+Convert(VARCHAR(50),b) as ab from tableName

如果是有小数的(例,b字段为float类型)

select a +' '+convert(varchar(20),convert(decimal(18,4),b)) as ab from tableName

注释:a,b为列名