Question

我正在使用PHP和PostgreSQL并运行以下查询：

$mobile = 1234;
SELECT pri_mobile, pri_mobile2, sec_mobile, sec_mobile2 
FROM contacts 
WHERE pri_mobile=$mobile 
    OR pri_mobile2=$mobile 
    OR sec_mobile=$mobile 
    OR sec_mobile2=$mobile

我想知道找到$mobile的字段。

我能想到的一种方法是循环，如果在任何字段中找到，那么就打破循环。只是想知道是否有更简单的方法来做到这一点？

由于

Answer 1

我想到了这个解决方案：

select source from
(
select pri_mobile as value, 'pri_mobile' as source FROM contacts
union
select pri_mobile2 as value, 'pri_mobile2' as source FROM contacts
union
select sec_mobile as value, 'sec_mobile' as source FROM contacts
union
select sec_mobile2 as value, 'sec_mobile2' as source FROM contacts
)
where value = $mobile

我不会把它称为漂亮但是=）

Answer 2

$mobile = 1234;

SELECT CASE 
  WHEN pri_mobile = $mobile then 'pri_mobile' 
  WHEN pri_mobile2 = $mobile then 'pri_mobile2' 
  WHEN sec_mobile = $mobile then 'sec_mobile'
  WHEN sec_mobile2 = $mobile then 'sec_mobile2'
END as my_column_name

FROM contacts 

WHERE pri_mobile=$mobile 
    OR pri_mobile2=$mobile 
    OR sec_mobile=$mobile 
    OR sec_mobile2=$mobile

查询多列中的一个值

2 个答案: