从php中的表中查找唯一值

Question

我有一个MySQL表，其中包含以下类型的信息：

hop_id  hop_1    hop_2    hop_3    hop_4..... hop_9  site_name  hop_count
1       abc>aaa  bcd>bbb  zxc>ccc                    GPAC       3
2       bcd>bbb  jkl>ddd  abc>aaa  pop>zoz           SNKL       4
3       jkl>ddd  zxc>ccc                             PBCL       2

我想从hop_1，hop_2，hop_3 ...... hop_9＆amp;中找到唯一值。打印它们。结果将是这样的。

hop       
abc>aaa
bcd>bbb
zxc>ccc
jkl>ddd 
pop>zoz

我使用distinct关键字，但它适用于一列，而不适用于所有列。我想打印为一个变量。请帮忙解决一下。提前谢谢。

Answer 1

这应该有效

SELECT DISTINCT(x.keyword) FROM (
SELECT DISTINCT hop_1 as keyword FROM your table
 UNION 
SELECT DISTINCT hop_2 as keyword FROM your table
 UNION 
SELECT DISTINCT hop_3 as keyword FROM your table
....
SELECT DISTINCT hop_9 as keyword FROM your table) as x