如何在插入语句中连接来自另一个表的两列值？

Question

I have a table Comment and I need to insert the values to the table Comment from another table ProComment as shown here:

INSERT INTO Comment (id, insertdate, commenttext, reviewdate) 
    VALUES (1, GETDATE(), 'This is the new review period from ', GETDATE())

But I want to get the reviewstartdate and reviewenddate from ProComment and need to append with commenttext in the Comment table, like this:

INSERT INTO Comment (id, insertdate, commenttext, reviewdate) 
    VALUES (1, GETDATE(),
        'This is the new review period from ' + (SELECT reviewstartdate, 'to ', reviewenddate FROM ProComment WHERE id = 1), 
        GETDATE())

Expected results will be "This is the new review period from 2018-05-05 to 2019-05-05" on the comment section

Answer 1

You need to get rid of the Table Value Constructor values and put a regular select statement including CONCAT() function or + operator to concatenate the strings :

insert into Comment( id, insertdate, commenttext, reviewdate) 
select 1, getdate(),
       concat('This is the new review period from ', reviewstartdate,' to ',reviewenddate), 
       getdate()
  from ProComment 
 where id = 1