带有两组括号而不是一组括号的默认值
假设我有一个 int 字段，我将默认值设置为 (0)，这可行，但我见过有人这样做((0))，为什么?
Let's say I have an int field, and I set the default value as (0), which works, but I've seen people doing it like this instead ((0)),why?
推荐答案
((0)) 是它在目录视图中或在 SSMS 中生成脚本时的显示方式.所以我认为当你看到它很可能是一个生成的脚本而不是从头开始手写的时候.
((0)) is how it will appear within the catalog views or if you generate a script in SSMS. So I think when you see that it's most likely a generated script and not hand-written that way from scratch.
也就是说，(0)、((0)) 甚至 ((((((((((((0))))))))))))) ...假设我数对了，额外的括号不会改变意思，只是可读性.
That said, there is nothing different between (0), ((0)) or even (((((((((((((0))))))))))))) ... assuming I counted right, extra parentheses don't change the meaning, just readability.
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