从表2除去表1的基础上，2场

Question

他们都有FILEID和用户id字段

表1： FILEID用户id

表2： FILEID用户id

我会喜欢从表2中删除所有行，如果他们不在表1，基于他们的fileId和userId ..不只是一个领域，但在两个...

亲切的问候， J

Answer 1

delete from table2 
where fileid not in (select fileid from table1) 
and userId not in (select userId from table1) 

Answer 2

TRY（假设id既是表的主键）

DELETE FROM table2 
WHERE id NOT IN ( 
     SELECT 'id' FROM table1 t1 
     INNER JOIN table2 t2 ON (t1.field=t2.filed AND t1.userid = t2.userid) 
     ) 

Answer 3

DELETE FROM table2 WHERE userId NOT IN (SELECT userId from table1) AND 
         fileId NOT IN (SELECT fileId from table1) 

Answer 4

退房这种方法。测试工作。

CREATE table table1(field varchar(10),userid varchar(20)); 
CREATE table table2(field varchar(10),userid varchar(20)); 

insert into table1 values('10','vish'); 
insert into table1 values('11','atul'); 
insert into table1 values('12','nish'); 

insert into table2 values('10','vish'); 
insert into table2 values('11','atul'); 
insert into table2 values('13','paul'); 
insert into table2 values('14','ganesh'); 

DELETE from table2 
WHERE NOT exists 
(select field+userid from table1 t1 where t1.field+userid = table2.field+userid); 

SELECT * FROM table2;