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新增mysql workbench字段标识解释
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README.md

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@@ -875,6 +875,20 @@ soup = BeautifulSoup("<html>data</html>")
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[官方文档](http://www.crummy.com/software/BeautifulSoup/bs4/doc.zh/)
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## mysql workbench
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使用 mysql workbench 建表时,字段中有PK,NN,UQ,BIN,UN,ZF,AI几个基本字段类型标识。
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它们分别代表的意思是:
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```
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PK:primary key 主键
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NN:not null 非空
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UQ:unique 唯一索引
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BIN:binary 二进制数据(比text更大)
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UN:unsigned 无符号(非负数)
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ZF:zero fill 填充0 例如字段内容是1 int(4), 则内容显示为0001
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AI:auto increment 自增
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```
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## Google Image Search API (Deprecated)
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[Google Image Search API (Deprecated)](https://developers.google.com/image-search/v1/jsondevguide?csw=1)

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