批量更改MySQL中特定字段的所有条目？
让我们首先创建一个演示表-
mysql> create table BulkChangeDemo -> ( -> CustomerId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> CustomerName varchar(20), -> isEducated boolean -> );
使用insert命令在表中插入一些记录。查询如下-
mysql> insert into BulkChangeDemo(CustomerName,isEducated) values('Larry',true);
mysql> insert into BulkChangeDemo(CustomerName,isEducated) values('John',false);
mysql> insert into BulkChangeDemo(CustomerName,isEducated) values('Carol',false);
mysql> insert into BulkChangeDemo(CustomerName,isEducated) values('Mike',true);
mysql> insert into BulkChangeDemo(CustomerName,isEducated) values('David',false);
mysql> insert into BulkChangeDemo(CustomerName,isEducated) values('Bob',false);使用select语句显示表中的所有记录。查询如下-
mysql> select *from BulkChangeDemo;
这是输出-
+------------+--------------+------------+ | CustomerId | CustomerName | isEducated | +------------+--------------+------------+ | 1 | Larry | 1 | | 2 | John | 0 | | 3 | Carol | 0 | | 4 | Mike | 1 | | 5 | David | 0 | | 6 | Bob | 0 | +------------+--------------+------------+ 6 rows in set (0.00 sec)
以下是查询以批量更改特定字段的所有条目-
mysql> update BulkChangeDemo set isEducated =true; Rows matched: 6 Changed: 4 Warnings: 0