CSV的样例中Select ... into outfile...是不带字段名的，只导出数据，所以需要自己想另外的办法实现，这里有一个笨招，自己构造一个字段列，示例如下：
1，创建测试表数据
CREATE TABLE test.c SELECT 1 AS pid,1 AS item,15.0 AS wgt UNION ALL
SELECT 1 AS pid,2 AS item,20.0 AS wgt UNION ALL
SELECT 1 AS pid,3 AS item,30.0 AS wgt UNION ALL
SELECT 1 AS pid,4 AS item,29.0 AS wgt;
SELECT * FROM test.c;
mysql> SELECT * FROM test.c;
+-----+------+------+
| pid | item | wgt |
+-----+------+------+
| 1 | 1 | 15.0 |
| 1 | 2 | 20.0 |
| 1 | 3 | 30.0 |
| 1 | 4 | 29.0 |
+-----+------+------+
4 ROWS IN SET (0.00 sec)
2，通过union all实现字段列，并且排在第一行
SELECT * FROM (
SELECT ‘pid‘ AS pid,‘item‘ AS item,‘wgt‘ AS wgt
UNION ALL
SELECT * FROM test.c
)a INTO OUTFILE ‘/tmp/c.csv‘
FIELDS TERMINATED BY ‘,‘
OPTIONALLY ENCLOSED BY ‘"‘
LINES TERMINATED BY ‘\n‘;
执行如下：
mysql> SELECT * FROM (
-> SELECT ‘pid‘ AS pid,‘item‘ AS item,‘wgt‘ AS wgt
-> UNION ALL
-> SELECT * FROM test.c
-> )a INTO OUTFILE ‘/tmp/c.csv‘
-> FIELDS TERMINATED BY ‘,‘
-> OPTIONALLY ENCLOSED BY ‘"‘
-> LINES TERMINATED BY ‘\n‘;
Query OK, 5 rows affected (0.00 sec)
3，去打开c.csv文件查看效果