MySQL语句操作（⊙）

查询数据库记录

SELECT

where条件语句（例：select * from tb_mrbook where type='php';）

GROUP UP对结果分组

ORDER BY对结果排序（对结果进行升序和降序排列，默认升序）

LIKE模糊查询（它有两种通配符：“%”’和“_”。% 能匹配多个字符，_ 只能匹配一个字符）

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