如何只选定的文件在mysql中导出到.csv

Question

如何只选定的文件在mysql中导出到.csv文件

例如：

Select * from tablename where column name = $somevalue 

如何返回值从查询导出？

Answer 1

使用into outfile（文档here）：

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

哦，添加你需要使用union all列名。 Yuch，因为这可能需要您将某些列明确地转换为正确的格式。

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 

举例来说，如果你有一列名为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