Can you explain in detail the meaning of "*" and "+"?
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We-chat. 2018-11-11 16:46:00
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Can you explain in detail the meaning of "*" and " "

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Peter-Zhu

*: NULL value or multiple values ​​are allowed;

+: NULL value is not allowed, there must be at least one, and of course there can be multiple;

This is the second The difference between them is that the length of * can start from 0, while the length of + must start from 1

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