oracle - Oracle 插入如果不存在语句

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 Oracle 中不存在新行，如何插入新行？

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

根据已经存在的另一条记录插入某些内容（在 Oracle 中）的正确方法是使用MERGE语句。

请注意，这个问题已经在这里回答了 SO：

• 如果行不存在，oracle 插入
• 如果不存在则插入 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中已经有一条带有mom@cox.net/的记录，则将从记录中减去该记录，并且不会插入任何内容。另一方面，如果没有这样的记录，则不会减去任何内容并且值/将被插入。100MINUSselect 'mom@coxnet' as email, 100 as campaign_id from dualMINUSmom@coxnet100

正如p.marino已经指出的那样，merge它可能是解决您的问题的更好（和更正确）的解决方案，因为它是专门为解决您的任务而设计的。

Answer 5

另一种方法是利用INSERT ALLoracle 的语法，

INSERT ALL 
    INTO table1(email, campaign_id) VALUES (email, campaign_id)
WITH source_data AS
 (SELECT 'mom@cox.net' email,100 campaign_id
  FROM   dual
  UNION ALL
  SELECT 'dad@cox.com' email,200 campaign_id
  FROM   dual)      
SELECT email
      ,campaign_id
FROM   source_data src
WHERE  NOT EXISTS (SELECT 1
        FROM   table1 dest
        WHERE  src.email = dest.email
        AND    src.campaign_id = dest.campaign_id);

INSERT ALL 还允许我们基于作为源的子查询对多个表执行条件插入。

有一些非常干净和很好的例子可供参考。

1. oracletutorial.com
2. oracle-base.com/