desc tablename
然后总行数就是你的字段数。
mysql> desc ysks+-------+---------------+-----
| Field | Type | Null
+-------+---------------+-----
| 单号 | int(11) | YES
| 金额 | decimal(10,2) | YES
| 已收 | decimal(10,2) | YES
| 日期 | bigint(20) | YES
| 名称 | varchar(10) | YES
| 余额 | decimal(10,2) | YES
| 备注 | varchar(10) | YES
| 品名 | varchar(10) | YES
+-------+---------------+-----
8 rows in set (0.06 sec)
mysql> select FOUND_ROWS()
+--------------+
| FOUND_ROWS() |
+--------------+
| 8 |
+--------------+
1 row in set (0.06 sec)
mysql>
方法二,通过系统表information_schema.`COLUMNS` ( mysql5以上版本支持)
mysql> select count(*) from information_schema.`COLUMNS`-> where TABLE_SCHEMA='csdn'
-> and TABLE_NAME='ysks'
+----------+
| count(*) |
+----------+
| 8 |
+----------+
1 row in set (0.06 sec)
mysql>
你试试:select order_number as num,order_time as time from order where order_phone='号码' group by order_phone
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