在多个列中搜索MySQL并找到匹配的列

我需要一些关于如何做到这一点的建议。如果我有这样的疑问 从

目录

中选择*其中

记录id

=$var或

表单id

=$var

我想做的是知道哪列匹配。是记录还是表格？

可能是这样的：

select a,b,c, 1 from catalog where record_id = $var
union
select a,b,c, 2 from catalog where form_id = $var

然后1或2告诉你哪个是哪个。

可能是这样的：

select a,b,c, 1 from catalog where record_id = $var
union
select a,b,c, 2 from catalog where form_id = $var

SELECT *, 
CASE
    WHEN record_id = $var and form_id = $var THEN 'both'
    WHEN record_id = $var THEN 'record_id'
    WHEN form_id = $var   THEN 'form_id'
    ELSE 'none'     -- can't happen becouse of where clause
END CASE  as how_it_was
FROM catalog WHERE record_id = $var OR form_id = $var;

然后1或2告诉你哪个是哪个

SELECT *, 
CASE
    WHEN record_id = $var and form_id = $var THEN 'both'
    WHEN record_id = $var THEN 'record_id'
    WHEN form_id = $var   THEN 'form_id'
    ELSE 'none'     -- can't happen becouse of where clause
END CASE  as how_it_was
FROM catalog WHERE record_id = $var OR form_id = $var;

请注意$var上的sql injetion

select *,
case when record_id = $var then 1 else 2 end as matches 
from table
where record_id = $var or form_id = $var

---

请注意$var上的sql injetion

您想如何/在何处使用此信息？您想如何/在何处使用此信息？很抱歉我的无知。我对路易斯和你犯了同样的错误。我得到了一个错误。您的SQL语法有错误；检查与MySQL服务器版本对应的手册，以了解第5行“table where record_id=522或form_id=123”附近使用的正确语法；对不起我的无知。我对路易斯和你犯了同样的错误。我得到了一个错误。您的SQL语法有错误；检查与MySQL服务器版本对应的手册，以了解第5行“table where record_id=522或form_id=123”附近使用的正确语法；

select *,
case when record_id = $var then 1 else 2 end as matches 
from table
where record_id = $var or form_id = $var