Oracle插入if not exists语句

Question

insert into OPT (email, campaign_id) values('mom@cox.net',100)
where not exists( select * from OPT where (email ="mom@cox.net" and campaign_id =100)) ;

错误报告:SQL错误:ORA-00933:SQL命令未正确结束00933. 00000 - "SQL命令未正确结束"*原因:
*操作:

如果在Oracle中不存在新行,如何插入？

Answer 1

insert into OPT (email, campaign_id) 
select 'mom@cox.net',100
from dual
where not exists(select * 
                 from OPT 
                 where (email ="mom@cox.net" and campaign_id =100));

Answer 2

基于已存在的另一条记录插入内容(在Oracle中)的正确方法是使用MERGE语句.

请注意,此问题已在SO上得到解答:

• oracle如果行不存在则插入
• 插入如果不存在oracle

Answer 3

MERGE INTO OPT
USING
    (SELECT 1 "one" FROM dual) 
ON
    (OPT.email= 'mom@cox.net' and OPT.campaign_id= 100) 
WHEN NOT matched THEN
INSERT (email, campaign_id)
VALUES ('mom@cox.net',100) 
;

Answer 4

insert into OPT       (email,        campaign_id) 
select 'mom@coxnet' as email, 100 as campaign_id from dual MINUS
select                 email,        campaign_id from OPT;

如果OPT中已存在mom@cox.net/ 100中的记录,MINUS则会从记录中减去此记录,select 'mom@coxnet' as email, 100 as campaign_id from dual并且不会插入任何内容.另一方面,如果没有这样的记录,MINUS则不会减去任何内容,并且将插入值mom@coxnet/ 100.

正如p.marino已经指出的那样,merge对于您的问题来说可能是更好(更正确)的解决方案,因为它专门用于解决您的任务.