SQL 查询语句？ - 调试易

SQL 查询语句？

select pid,a.num1,b.num2 from (第一句 as a),(第二句 as b)
where a.pid=b.pid
这样？
这样行不通忘了补充下，是在MYSQL里执行

解决方案 »

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mysql> select pid,count(*) as num1 from netinfo where mt_wid<>'0000' group by pid order by num1;
+-------+------+
| pid   | num1 |
+-------+------+
| 23769 |   14 |
| 27866 |   18 |
| 55520 |   19 |
| 16877 |   26 |
| 12345 |   91 |
+-------+------+
5 rows in set (0.00 sec)mysql> select pid,count(*) as num2 from netinfo where mt_wid='0000' group by pid order by num2;
Empty set (0.00 sec)