Question

我有疑问：

SELECT TOP 20 f.id_service AS f_id_service,
              f.id_city    AS f_id_city,
              f.name       AS f_name,
              f.address    AS f_address,
              f.business   AS f_business,
              f.web        AS f_web,
              f.phone      AS f_phone,
              f.id_firm    AS f_id_firm
FROM   Firm f
       LEFT JOIN Price p
         ON p.id_service = f.id_service
            AND p.id_city = f.id_city
            AND p.id_firm = f.id_firm
WHERE  f.name NOT IN (SELECT DISTINCT TOP 20 f.name
                      FROM   Firm f
                      WHERE  f.blocked = '0'
                             AND ( f.name LIKE 'АВТО%'
                                    OR f.phone LIKE 'АВТО%' )
                             AND ( f.phone != ''
                                    OR f.address != '' )
                             AND f.id_city = '73041'
                      ORDER  BY f.name ASC)
       AND f.dogovor = '1'
       AND f.blocked = '0'
       AND ( f.name LIKE 'АВТО%'
              OR f.phone LIKE 'АВТО%' )
       AND ( f.phone != ''
              OR f.address != '' )
       AND f.id_city = '73041

请告诉我如何使这个查询只选择唯一的f.name？

Answer 1

将SELECT更改为此

SELECT DISTINCT TOP 20 
    f.name as f_name
FROM ...

您不能拥有所有列值，但DISTINCT只是其中之一：它没有任何意义。

Answer 2

试试这个

SELECT DISTINCT
TOP 20 
f.id_service as f_id_service, 
f.id_city as f_id_city, 
f.name as f_name, 
f.address as f_address, 
f.business as f_business, 
f.web as f_web,

Answer 3

使用DISTINCT关键字：

SELECT DISTINCT
TOP 20 
f.id_service as f_id_service, 
f.id_city as f_id_city, 
f.name as f_name, 
f.address as f_address, 
f.business as f_business, 
f.web as f_web, 
f.phone as f_phone, 
f.id_firm as f_id_firm FROM Firm f 
left join Price p on p.id_service=f.id_service 
AND p.id_city=f.id_city AND p.id_firm=f.id_firm 
WHERE 
f.name NOT IN (
SELECT DISTINCT TOP 20 f.name FROM Firm f 
WHERE f.blocked='0' 
AND (f.name LIKE 'АВТО%' OR f.phone LIKE 'АВТО%') 
AND (f.phone !='' OR f.address != '') AND f.id_city='73041' 
ORDER BY f.name ASC ) AND f.dogovor='1' 
AND f.blocked='0' AND (f.name LIKE 'АВТО%' OR f.phone LIKE 'АВТО%') 
AND (f.phone !='' OR f.address != '') 
AND f.id_city='73041'

因为所有列都来自一个表，除非name表中firm是唯一的，否则您不能像这样使用DISTINCT。您需要决定在重复的情况下显示哪家公司然后制作复杂的查询来实现这一点。

如何使查询具有独特性？

3 个答案: