" ‘ "（單引號）的運用：在sql server中，兩個" ‘ "(單引號)在拼接字符串的情況下運用，就是表示拼接上了一個" ‘ "單引號字符串。

SELECT TOP 1 ‘‘‘‘+CONVERT(nvarchar(50),keyid)+‘‘‘‘ name1 FROM Rel_ProductStockLock with (nolock) WHERE KeyId IS NOT NULL
SELECT TOP 1 ‘‘‘‘+CONVERT(nvarchar(50),keyid)+‘‘‘,‘ name2 FROM Rel_ProductStockLock with (nolock) WHERE KeyId IS
 
 NOT NULL
SELECT ‘‘‘‘ name3;
SELECT ‘123‘‘‘ name4;
SELECT ‘123‘+‘‘ name5;
SELECT  ‘"123"‘ name6;
SELECT TOP 1 ‘123‘+AreaName name7 FROM dbo.Dim_Area;
SELECT TOP 1 ‘123‘‘‘+AreaName name8 FROM dbo.Dim_Area;
SELECT TOP 1 ‘123‘‘‘+AreaName+‘‘  name9 FROM dbo.Dim_Area;
SELECT TOP 1 ‘123‘‘‘+AreaName+‘‘‘‘ name10 FROM
 
 dbo.Dim_Area;

https://www.cnblogs.com/zhaosw/p/6088040.html 關於sql 拼接字符串的問題

Sql Server添加單引號