MYSQL: 如何避免插入重复记录?
MYSQL: How to avoid inserting duplicate records?
我正在做如下插入语句:
Insert into table2 (host, ip, domain, statusnew)
select hostname, ip, domain, "True" from table1 t1, table2 t2
where t1.status = "Done"
and t2.statusnew not regexp "True"
limit 10
;
我添加语句t2.statusnew not regexp "True"
只是为了确保没有重复插入。但是,它正在添加重复的行。
如何确保没有重复条目?
INSERT INTO TABLE_2
(id, name)
SELECT t1.id,
t1.name
FROM TABLE_1 t1
WHERE NOT EXISTS(SELECT id FROM TABLE_2 t2 WHERE t2.id = t1.id)
您好,您可以使用 IGNORE 关键字来避免重复记录。
喜欢:
- INSERT IGNORE INTO employee (last_name, first_name) VALUES( 'Rinku', 'Gohel');
我正在做如下插入语句:
Insert into table2 (host, ip, domain, statusnew)
select hostname, ip, domain, "True" from table1 t1, table2 t2
where t1.status = "Done"
and t2.statusnew not regexp "True"
limit 10
;
我添加语句t2.statusnew not regexp "True"
只是为了确保没有重复插入。但是,它正在添加重复的行。
如何确保没有重复条目?
INSERT INTO TABLE_2
(id, name)
SELECT t1.id,
t1.name
FROM TABLE_1 t1
WHERE NOT EXISTS(SELECT id FROM TABLE_2 t2 WHERE t2.id = t1.id)
您好,您可以使用 IGNORE 关键字来避免重复记录。 喜欢:
- INSERT IGNORE INTO employee (last_name, first_name) VALUES( 'Rinku', 'Gohel');