Question

我需要从表中删除所有包含＆＃34; for_id＆＃34;的记录。参数是指＆＃34; id＆＃34;这个表中没有。

In this example，我需要删除name =＆＃34;汤姆＆＃34;因为id = 3的条目不存在。

谢谢！

Answer 1

因此，您希望remove for_id not exist中id keep的记录for_id 换句话说，exists id SELECT * FROM table_name where for_id in (select id from table_name) join SELECT t1.* FROM table_name t1 join table_name t2 on t1.for_id=t2.id

| id | for_id | lvl | name |
|----|--------|-----|------|
|  4 |      1 |   1 |  joe |
|  5 |      1 |   1 | mack |
|  6 |      5 |   2 | bill |
|  7 |      5 |   2 |  rex |
|  8 |      7 |   3 |  ted |

或使用date --date='last Monday' date --date='last week + last Thursday' date --date='last week + last Monday'：

CREATE EXTERNAL TABLE IF NOT EXISTS abc ( mail string, Type string, Id bigint, Date string, LId bigint, value string)
ROW FORMAT SERDE 'com.ibm.spss.hive.serde2.xml.XmlSerDe'
WITH SERDEPROPERTIES (
"column.xpath.OptOutEmail"="/Re/mail/text()",
"column.xpath.OptOutType"="/Re/Type/text()",
"column.xpath.SurveyId"="/Re/Id/text()",
"column.xpath.RequestedDate"="/Re/Date/text()",
"column.xpath.EmailListId"="/Re/Lists/LId/text()",
"column.xpath.Description"="/Re/Lists/value/text()")
STORED AS INPUTFORMAT 'com.ibm.spss.hive.serde2.xml.XmlInputFormat'
OUTPUTFORMAT 'org.apache.hadoop.hive.ql.io.IgnoreKeyTextOutputFormat'
LOCATION '/abc/xyz'
TBLPROPERTIES ("xmlinput.start"="<Out>","xmlinput.end"= "</Out>");

输出：

HtmlFieldPrefix

Answer 2

如果你想删除那些for_id = 0的那个，你可以使用：

DELETE 
FROM table_name as t1
where not exists (select id 
       from table_name as t2 
       where t2.id=t1.for_id)

如果你不想删除那些for_id = 0的你可以使用：

delete 
FROM table_name as t1
where not exists (select id 
       from table_name as t2 
       where t2.id=t1.for_id) and t1.for_id<>0

Answer 3

DELETE D.* FROM table_name D
  LEFT JOIN table_name T
    ON T.ID=D.FOR_ID
 WHERE T.ID IS NULL and D.FOR_ID<>0;

在sqlfiddle.com上进行测试

MySQL删除具有引用不存在ID的参数的行

3 个答案: