從 MySQL 資料庫表中刪除多個條目


要從 MySQL 資料庫表中刪除多個條目,請使用 JOIN。我們首先建立一個表 -

mysql> create table DemoTabl(Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, FirstName varchar(100));
Query OK, 0 rows affected (0.69 sec)

使用 insert 命令在表中插入一些記錄 -

mysql> insert into DemoTable(FirstName) values('Chris');
Query OK, 1 row affected (0.19 sec)
mysql> insert into DemoTable(FirstName) values('Bob');
Query OK, 1 row affected (0.17 sec)
mysql> insert into DemoTable(FirstName) values('Mike');
Query OK, 1 row affected (0.28 sec)
mysql> insert into DemoTable(FirstName) values('Adam');
Query OK, 1 row affected (0.33 sec)
mysql> insert into DemoTable(FirstName) values('Bob');
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable(FirstName) values('Adam');
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable(FirstName) values('Bob');
Query OK, 1 row affected (0.12 sec)
mysql> insert into DemoTable(FirstName) values('Mike');
Query OK, 1 row affected (0.23 sec)

使用 select 語句顯示錶中的所有記錄 -

mysql> select *from DemoTable;

這將生成以下輸出 -

+----+-----------+
| Id | FirstName |
+----+-----------+
| 1 | Chris      |
| 2 | Bob        |
| 3 | Mike       |
| 4 | Adam       |
| 5 | Bob        |
| 6 | Adam       |
| 7 | Bob        |
| 8 | Mike       |
+----+-----------+
8 rows in set (0.00 sec)

以下是刪除多個條目的查詢 -

mysql> delete DemoTable
   from DemoTable
      join DemoTable tbl on DemoTable.FirstName= tbl.FirstName
      where tbl.FirstName = 'Bob';
Query OK, 3 rows affected (0.15 sec)

讓我們再次查看錶記錄 -

mysql> select *from DemoTable;

這將生成以下輸出 -

+----+-----------+
| Id | FirstName |
+----+-----------+
| 1 | Chris      |
| 3 | Mike       |
| 4 | Adam       |
| 6 | Adam       |
| 8 | Mike       |
+----+-----------+
5 rows in set (0.00 sec)

更新日期: 2019-08-22

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