Question

我想允许用户根据同一个表（目标和名称）中的两个不同字段进行搜索。但是，如果目标上存在完全匹配，我希望它优先于订单，因此首先显示目标为dis的行。

将不胜感激。

select 
    Id 
    ,[target] 
    ,[name] 
    ,[extrafield1]
    ,[extrafield2]
    ,[extrafield3]
From [inventory]
where [target] LIKE 'dil%' OR [name] LIKE '%dil%'

Answer 1

这样的东西？

select 
    Id 
    ,[target] 
    ,[name] 
    ,[extrafield1]
    ,[extrafield2]
    ,[extrafield3]
From [inventory]
where [target] LIKE 'dil%' OR [name] LIKE '%dil%'
order by
  case when target = 'dil' then 0 else 1 end asc,
  case when name = 'dil' then 0 else 1 end asc

Answer 2

似乎是IF/ELSE语句

的一个很好的用例

IF EXISTS(SELECT 1 FROM [inventory]
    where [target] LIKE 'dil%')
    BEGIN
        select 
        Id 
        ,[target] 
        ,[name] 
        ,[extrafield1]
        ,[extrafield2]
        ,[extrafield3]
    From [inventory]
    where [target] LIKE 'dil%'
    END
ELSE
    BEGIN
        select 
            Id 
            ,[target] 
            ,[name] 
            ,[extrafield1]
            ,[extrafield2]
            ,[extrafield3]
        From [inventory]
        where [name] LIKE '%dil%'
    END

Answer 3

尝试使用union ..

select 
   Id 
   ,[target] 
   ,[name] 
   ,[extrafield1]
   ,[ Extrafield2]
   ,[extrafield3]
  From [inventory]
    where [target] LIKE 'dil%' 

  Union
   select 
  Id 
  ,[target] 
  ,[name] 
  ,[extrafield1]
  ,[extrafield2]
   ,[ Extrafield3]
  From [inventory]
  where [name] LIKE '%dil%'

Answer 4

不要在字符串的两边使用widlcard，即。％string％这将导致对表的串行读取。把它放在右侧。

select 
    Id 
    ,[target] 
    ,[name] 
    ,[extrafield1]
    ,[extrafield2]
    ,[extrafield3]
    ,case when [target] = 'dil' or [name] = 'dil' then 1 else 2 end as rank -- to display your ranking
From [inventory]
where [target] LIKE 'dil%' or [name] like 'dil%'   
order by case when [target] = 'dil' or [name] = 'dil' then 1 else 2 end

SQL查询将一个where子句排在另一个子句之外

4 个答案: