如果记录包含空格，是否使MySQL DISTINCT正常工作？
为了获得包括空格的独特性，您可以使用以下语法-
SELECT DISTINCT replace(yourColumnName,' ','') FROM yourTableName;
让我们首先创建一个表：
mysql>create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Name varchar(20) );
使用插入命令在表中插入一些记录-
mysql>insert into DemoTable(Name) values('John ');
mysql>insert into DemoTable(Name) values(' John ');
mysql>insert into DemoTable(Name) values('John');
mysql>insert into DemoTable(Name) values('Sam');
mysql>insert into DemoTable(Name) values('Carol');
mysql>insert into DemoTable(Name) values(' Sam');
mysql>insert into DemoTable(Name) values('Mike ');
mysql>insert into DemoTable(Name) values('David');以下是使用select语句显示表中所有记录的查询：
mysql>select *from DemoTable;
这将产生以下输出-
+----+-----------+ | Id | Name | +----+-----------+ | 1 | John | | 2 | John | | 3 | John | | 4 | Sam | | 5 | Carol | | 6 | Sam | | 7 | Mike | | 8 | David | +----+-----------+ 8 rows in set (0.00 sec)
这是获取包含空格的查询：
mysql>SELECT DISTINCT replace(Name,' ','') FROM DemoTable;
这将产生以下输出-
+----------------------+ | replace(Name,' ','') | +----------------------+ | John | | Sam | | Carol | | Mike | | David | +----------------------+ 5 rows in set (0.00 sec)