問題描述：提供一個csv文件，記錄的是一些不同數據庫的不同表中的共同字段account_id數據，需要在A庫的account表中做關聯刪除
解決思路：csv文件中儲存的都是account_id，六位純數字id。可以建立一張臨時表，將csv數據導入臨時表中，最後做關聯刪除。
1.備份原表 CREATE table A.account_0220 as select * from A.account; alter table A.account_0220 comment = 'This is a backup table. Please drop it after 20230320'; 2.導入數據到臨時表 創建臨時表 create table test.transit_tmp(account_id int); 導入數據到臨時表 load data local infile '/tmp/0220/202302201526.csv' into table test.transit_tmp fields terminated by ',' optionally enclosed by '"' escaped by '"' lines terminated by '\r\n'; 查詢臨時表數據量 select count(*) from transit_tmp; +----------+ | count(*) | +----------+ | 10369 | +----------+ 1 row in set (0.003 sec) 3.查詢數據是否匹配 查詢account表中與tmp關聯數據行數,查詢到匹配數據與實際csv數據相差一行 MariaDB [(none)]> select count(*) from A.account where account_id in (select * from test.transit_tmp); +----------+ | count(*) | +----------+ | 10368 | +----------+ 1 row in set (42.539 sec)
MariaDB [test]> select * from transit_tmp order by account_id asc limit 1;
+------------+
| account_id |
+------------+
| 0 |
+------------+
1 row in set (0.003 sec)
MariaDB [test]> select * from transit_tmp order by account_id asc limit 2;
+------------+
| account_id |
+------------+
| 0 |
| 261607 |
+------------+
2 rows in set (0.003 sec)
查詢到數據不匹配，csv文件中有一行是字段名,load data把account_id這一行當成0插入到了臨時表中
![]()
刪除test.transit_tmp表中數據爲0的一行
delete from test.transit_tmp where account_id='0';
4.清理目標表相關數據
set autocommit=0;
delete from A.account where account_id in (select * from test.transit_tmp);
commit;