delete from yourTableName where yourColumnName=' ' OR yourColumnName IS NULL; 上面的语法将删除空白行和NULL行。
为了理解这个概念，让我们创建一个表。创建表的查询如下
mysql> create table deleteRowDemo -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> StudentName varchar(20) -> ); 使用insert命令在表中插入一些记录。
查询如下
mysql> insert into deleteRowDemo(StudentName) values('John'); mysql> insert into deleteRowDemo(StudentName) values(''); mysql> insert into deleteRowDemo(StudentName) values(''); mysql> insert into deleteRowDemo(StudentName) values(NULL); mysql> insert into deleteRowDemo(StudentName) values('Carol'); mysql> insert into deleteRowDemo(StudentName) values('Bob'); mysql> insert into deleteRowDemo(StudentName) values(''); mysql> insert into deleteRowDemo(StudentName) values('David'); 使用select语句显示表中的所有记录。
查询如下
mysql> select *from deleteRowDemo; 以下是输出
+----+-------------+ | Id | StudentName | +----+-------------+ | 1 | John | | 2 | | | 3 | | | 4 | NULL | | 5 | Carol | | 6 | Bob | | 7 | | | 8 | David | +----+-------------+ 8 rows in set (0.00 sec) 这是删除空白行以及NULL的查询
mysql> delete from deleteRowDemo where StudentName='' OR StudentName IS NULL; 现在，让我们再次检查表记录。
查询如下
mysql> select *from deleteRowDemo; 以下是输出
+----+-------------+ | Id | StudentName | +----+-------------+ | 1 | John | | 5 | Carol | | 6 | Bob | | 8 | David | +----+-------------+ 4 rows in set (0.00 sec) 关于“mysql如何删除空的数据”这篇文章的内容就介绍到这里，感谢各位的阅读！
