Question

SELECT查询

SELECT a. * , d.agent_id, COUNT( d.driver_id ) AS `noofdrivers`
                                      FROM ta_agent a, ta_drivers d
                                      WHERE a.agent_id = d.agent_id
                                      AND a.agent_id = ".$agent_id."
                                      GROUP BY a.agent_id

SELECT查询返回以下记录

agent_id  agent_name company_name  pricing_plan  noofdrivers
--------  ----------  -----------  ------------  -----------
    3         CCC           ZZZ          8499       2
    2         BBB           YYY          3499       3

DRIVER DB TABLE

agent_id  driver_id   driver_name
--------  ----------  -----------
2         1           EEE
2         2           FFF
2         3           GGG
1         4           HHH
3         5           III
3         6           JJJ

如何根据上面的SELECT查询结果插入记录。如果pricing_plan为3499 agent_id 2，则只能添加5个驱动程序。现在，agent_id 2有3个驱动程序。所以，他仍然只能添加2个驱动程序。如何在mysql查询中限制限制？

Answer 1

试试这个，

insert into driver(driver_id, agent_id, driver_name)
   select ins.driver_id, ins.agent_id, ins.driver_name
   from (select 7 as driver_id, 2 as agent_id, 'KKK' as driver_name) ins
   where (select count(*) 
      from driver d, agent a
      where d.agent_id=a.agent_id and a.agent_id=ins.agent_id and a.pricing_plan=3499)<5;

在给定查询中，您必须为值$driver_id，$agent_id和{{1}放置变量$driver_name，7和2分别。

所以，它看起来像，

'KKK'

这是 DEMO SQLFiddle

Answer 2

您可以使用以下内容：

insert into ta_drivers(agent_id, driver_id, driver_name) SELECT (agent_id, driver_id, driver_name) FROM dual where ((SELECT a. * , d.agent_id, COUNT( d.driver_id ) AS `noofdrivers`
                                  FROM ta_agent a, ta_drivers d
                                  WHERE a.agent_id = d.agent_id
                                  AND pricing_plan=3499 and a.agent_id = ".$agent_id."
                                  GROUP BY a.agent_id)<5);

您必须检查查询，因为不行。但理论上：

insert into table select from dual where ((select count(*) condition) <5);

MYSQL INSERT查询基于具有LIMIT限制的SELECT查询

2 个答案: