我是T-SQL的新手,我想知道为什么下面的代码是有效的,并且没有引发错误:DECLARE @aVARCHAR(200), @b VARCHAR(100) SET @b = 'ALTER TABLE abc DROP CONSTRAINT ' + @a; <-------- expected it to contain然后我期望@b有字符串'ALTER TABLE abc DROP string‘,但在调试
基本上,我有一个if声明,做所有必要的事情echo "You must set x variable, please see readme.md on howto get & set this variable."fiecho "${x:?You must set x variable, please see readme.md on how to get & set</