过滤表中的数据

Question

I have two tables account_agent and bulk_index . The data on each table is as follows

account_agent

id         name         
1          Tom           
2          Brad           
3          John           
4          Jan        
5          Bartosz 

account_agent to filter

id         name         
1          Tom              
3          John              
5          Bartosz 

using these tables I want to make a normalized view that contains all agents from first table, but without agents placed in second table.

account_agent_filtered

name         code         
2            Brad 
4            Jan  

I have a lot of data and with cross join I could just do an opposite thing, but now I do not want to match. I want to filter and I do not have any idea how to do this.

Answer 1

Unfortunately, MySQL doesn't have an except set operator, but you could emulate this behavior using exists :

SELECT *
FROM   account_agent aa
WHERE  NOT EXISTS (SELECT *
                   FROM   account_agent_to_filter aatf
                   WHERE  aa.id = aatf.id AND aa.name = aatf.name)

Answer 2

In addition to Mureinik 's answer :

SELECT t1.*
FROM account_agent t1
LEFT JOIN account_agent_to_filter t2 USING (id, name)
WHERE t2.id IS NULL