Tsql 如何在T-SQL和SQLCMD脚本中连接常量字符串？

我还在学习T-SQL和SQLCMD脚本的基础知识

是否可以将字符串（作为父文件夹路径）与其他字符串（作为子文件夹路径）连接起来

我已经看到了一些以前的线程，但还没有找到解决方案

谢谢你的见解

-- Global variables
DECALRE @PARENT_PATH NVARCHAR(256);
SET @PARENT_PATH = 'parent_path'; -- OK, works but I've seen some string ending with '%'..

-- Some steps to check if the database already exists and deals with it
-- ..

-- Database creation
CREATE DATABASE [MyDatabase]
ON
    (NAME = "MyDatabase",
    FILENAME = @PARENT_PATH + "MyDatabase.mdf") -- How to do it? I know the CONCAT() function, but doesn't seem to work. Should I define and set another intermediate variable, instead of concatenating it directly?
LOG ON
    (Name = "MyDatabase_log",
    FILENAME = @PARENT_PATH + "MyDatabase_log.ldf")
GO

-- Table creation
-- ..

-- Executes stored procedures scripts (SQLCMD) where each stored procedure is written in a separate file
:setvar STORED_PROCEUDRE_PATH @PARENT_PATH + "Stored Procedures\" -- How to do it?

:r $(STORED_PROCEUDRE_PATH)spStoreProcedureName.sql

-- By the way, still need to get used to the following SQLCMD loop syntax 
-- FOR %%Script IN ($(STRORE_PROCEDURE_PATH)*.sql) DO sqlcmd /S servername /d MyDatabase -E -i" %%Script"
-- PAUSE