mysql - 如何仅将 mysql 中的选定文件导出到 .csv

Question

如何仅将 mysql 中的选定文件导出到 .csv 文件

例子：

Select * from tablename where column name = $somevalue

如何从该查询中导出返回值？

Answer 1

使用into outfile（此处的文档）：

select *
into outfile 'the/file/you/want.csv'
from tablename
where column = $somevalue

哦，要添加列名，您需要使用union all. 太好了，因为这可能需要您将某些列显式转换为正确的格式。

select <all columns except "isheader">
into outfile 'the/file/you/want.csv'
from ((select 1 as isheader, <list of column names in quotes>
      ) union all
      (select 0 as isheader, t.*
       from tablename
       where column = $somevalue
      )
     ) t
order by isheader desc

例如，如果您有一列名为id：

select id
into outfile 'the/file/you/want.csv'
from ((select 1 as isheader, 'id' as id
      ) union all
      (select 0 as isheader, t.id
       from tablename t
       where column = $somevalue
      )
     ) t
order by isheader desc