mysql - 将 mysql 查询的结果(带有多个 UNION)输出到 CSV

Question

我想将使用多个联接、分组依据和排序依据的查询结果输出到 CSV 文件中。

查询本身使用 UNION 生成结果集、一个空白行和一个总计行。

当我尝试使用 UNION ALL 将文件输出到 CSV 时，出现错误

select "header1", "header2", "header3"
UNION ALL
(  
   select field1, field2, field3
   from tablename1
   UNION
   select "","",""
   UNION
   select "Total", field2, field3
)
into outfile 'c:\\data.csv' 
FIELDS TERMINATED BY ',' 
OPTIONALLY ENCLOSED BY '"'
LINES TERMINATED BY '\n';

Err 1064: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'UNION (select "","","","","","","","","","","" ) ' at line <6>

预先感谢您的帮助。

Answer 1

请注意这样的事情:

select 1, 2, 3
union all
(
  select 0,4,6
  union
  select 1,1,1
)

不会工作。

您应该使用像这样的派生表:

select 1, 2, 3
union all
select * from (
  select 0,4,6
  union
  select 1,1,1
) x