Echoing all values from a MySQL table column

Question

I have a database table that looks something like this:

User   | Group  
----------------
Bob    | test1  
Susy   | test 1  
Martha | test 2  
Bill   | test 3  
Jake   | test 3  

I want to output all values from the group column, but repeat none. My goal output is this:

test1, test 2, test 3

Is there an easy way to do this via PHP?

Answer 1

You have plenty of ways to do this, either pure SQL or PHP. Here are three:

With GROUP BY :

SELECT `Group` FROM Users GROUP BY `Group`

With DISTINCT:

SELECT DISTINCT `Group` FROM Users

Using array_unique() native php method

By the way, don't use reserved sql keywords as column or table names.

Answer 2

关键是SQL命令应包含DISTINCT关键字：

select distinct group from tableName

Answer 3

您可以将来自MySQL表的读取值导入到基于本地（php代码）的数组中，然后遍历该数组以查看是否已读取了要检查的值，如果没有，则回显。

Answer 4

Change the name of the field from Group to something else or you might end up with problems

$data = mysql_query("Select distinct Group from table") or die(mysql_error());
while($row = mysql_fetch_array($data))
{
     echo $row["Group"];
}