使用 where 子句时 Group_concat 不显示所有值

Question

我正在使用具有多个连接和 group_concat 的复杂查询，这是查询：

 select a.packagename as packagename, a.packageid as packageid, 
 sum(a.packageduration) as days, (a.packageprice + a.seater_4) as price,
 b.statename,
 substring_index(GROUP_CONCAT( DISTINCT (select f.placename )  SEPARATOR ', 
 '),',',4) placename,
 substring_index(GROUP_CONCAT( DISTINCT (select d.packagetypename )  
 SEPARATOR ', '),',',4) packagetypename
 from tblpackages a
 join tblstates b on b.stateid = a.stateid              
 join tblpackage_packagetypes c on c.packageid = a.packageid
 join tblpackagetype d on d.packagetypeid = c.packagetypeid
 join tblpackageplaces e on e.packageid = a.packageid
 join tblplaces f on f.placeid = e.placeid
                where d.placename = "placename"
                 group by a.packageid

我的 packagetypename 的 group_concat 根据查询显示 4 个值，但 placename 仅显示 where 子句中给出的 1 个值？

因为查询是按包 id 分组的，对于任何包，我有 N 个地方.... 查询按逻辑工作正常，但我想显示我对应的包 id 的所有包

Answer 1

输出你的查询，位修改为

select a.packagename as packagename, a.packageid as packageid, 
a.packageduration as days, (a.packageprice + a.seater_4) as price,
b.statename,
substring_index(GROUP_CONCAT( DISTINCT (select f.placename )  SEPARATOR ', '),',',4) 
placename,
substring_index(GROUP_CONCAT( DISTINCT (select d.packagetypename )  SEPARATOR ', 
'),',',4) packagetypename
from tblpackages a
inner join tblstates b on b.stateid = a.stateid              
inner join tblpackage_packagetypes c on c.packageid = a.packageid
inner  join tblpackagetype d on d.packagetypeid = c.packagetypeid
inner join tblpackageplaces e on e.packageid = a.packageid
left join tblplaces f on f.placeid = e.placeid  and d.packagetypename = 'religious'
                 group by a.packageid

pname、pid、days、price、statename、placename、packagetypename

---

test1, 1, 3, 111, xyz, (katra, shiv khori), 宗教
test2, 2, 3, 444, xyz, (Katra), 宗教

test3, 3, 3, 445, xyz, NULL, (家庭, 情侣, 冒险, 朋友)

test4, 4, 555, xyz, (Katra, Patnitop, sanasar, nathatop), (religious, family, Couple, Adventure)

test6 , 666, abc, NULL, (家庭、冒险、朋友)

包 id 3 和 6 不是必需的

Answer 2

我建议将WHERE 子句中的条件移至ON 子句中的相应连接，并将该连接设为左连接：

SELECT ...
FROM tblpackages a
INNER JOIN tblstates b
    ON b.stateid = a.stateid              
INNER JOIN tblpackage_packagetypes c
    ON c.packageid = a.packageid
LEFT JOIN tblpackagetype d
    ON d.packagetypeid = c.packagetypeid AND d.placename = 'placename'
INNER JOIN tblpackageplaces e
    ON e.packageid = a.packageid
INNER JOIN tblplaces f
    ON f.placeid = e.placeid
GROUP BY
    a.packageid