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The following is followed by the author to understand the simple reason why char must be disabled in the MySQL development specification. I believe everyone will benefit a lot after reading it. The text is not much in the essence. I hope that the simple reason why char must be disabled in the MySQL development specification is what you want.

I. explanation

Exactly how the channel channel number should choose the data type, there are two choices, one is char (), the other is varchar (). There are all kinds of things you can see in the system, there are no rules, and there is no way out. You need to develop a specification to disable char ().

Second, the reason

1. Char extension will cause table locks, which will affect the business.

2. The varchar extension will not rebuild the table within 255. it will not lock the table and will not affect the business.

3, especially the varchar data type must be used, such as channel (3) channel number.

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