如何使用 UNION 和 IN 运算符创建灵活的搜索查询？答案

【问题标题】：How to create flexible search query with UNION & IN operator?如何使用 UNION 和 IN 运算符创建灵活的搜索查询？
【发布时间】：2019-12-05 11:57:52
【问题描述】：

执行以下查询后，我从两个目录“catalogA”和“catalogB”中获取所有产品的 UNION 查询：

SELECT uniontable.PK, uniontable.creationtime AS TIMECREATED FROM
    (
       {{
          SELECT {p:mode},{p:brandno},{creationtime} AS creationtime FROM {Product AS p JOIN catalogversion AS cv ON
 {p:catalogversion}={cv:pk} JOIN catalog AS cat ON {p:catalog}={cat:pk}}
          WHERE {p.code} = '145' AND {cv:version}='Staged' AND {cat:id}='catalogA'
       }}
       UNION ALL
       {{
          SELECT {p:mode},{p:brandno},{creationtime} AS creationtime FROM {Product AS p JOIN catalogversion AS cv ON
 {p:catalogversion}={cv:pk} JOIN catalog AS cat ON {p:catalog}={cat:pk}}
          WHERE {p.code} = '123' AND {cv:version}='Staged' AND {cat:id}='catalogB'
       }}
    ) uniontable ORDERR BY TIMECREATED

我只需要来自 UNION 查询的 CatalogA 中的产品，所以我做了如下子查询，但它会引发错误。任何帮助将不胜感激？

查询 2：

SELECT uniontable.PK, uniontable.creationtime AS TIMECREATED FROM {Product AS p JOIN catalogversion AS cv ON
 {p:catalogversion}={cv:pk} JOIN catalog AS cat ON {p:catalog}={cat:pk}}
          WHERE {cv:version}='Staged' AND {cat:id}='catalogA' IN 
    (
       {{
          SELECT {p:mode},{p:brandno},{creationtime} AS creationtime FROM {Product AS p JOIN catalogversion AS cv ON
 {p:catalogversion}={cv:pk} JOIN catalog AS cat ON {p:catalog}={cat:pk}}
          WHERE {p.code} = '145' AND {cv:version}='Staged' AND {cat:id}='catalogA'
       }}
       UNION ALL
       {{
          SELECT {p:mode},{p:brandno},{creationtime} AS creationtime FROM {Product AS p JOIN catalogversion AS cv ON
 {p:catalogversion}={cv:pk} JOIN catalog AS cat ON {p:catalog}={cat:pk}}
          WHERE {p.code} = '123' AND {cv:version}='Staged' AND {cat:id}='catalogB'
       }}
    ) uniontable ORDERR BY TIMECREATED

【问题讨论】：

只是我的理解，你为什么不直接通过查询产品表而不是UNION来获取数据。无论如何，让我根据你提到的场景来回答。

标签： hybris flexible-search

【解决方案1】：

你只需要用WHERE uniontable.catalog = 'catalogA'过滤临时表

喜欢

SELECT * FROM
(
   {{
      SELECT {p:pk},{p:mode},{p:brandno},{creationtime} AS creationtime, {cat:id} AS catalog 
      FROM {    Product AS p 
                JOIN catalogversion AS cv ON {p:catalogversion}={cv:pk} 
                JOIN catalog AS cat ON {p:catalog}={cat:pk}
            }
      WHERE {p.code} = '145' AND {cv:version}='Staged' AND {cat:id}='catalogA'
   }}
   UNION ALL
   {{
      SELECT {p:pk},{p:mode},{p:brandno},{creationtime} AS creationtime, {cat:id} AS catalog  
      FROM {    Product AS p 
                JOIN catalogversion AS cv ON {p:catalogversion}={cv:pk} 
                JOIN catalog AS cat ON {p:catalog}={cat:pk}
            }
      WHERE {p.code} = '123' AND {cv:version}='Staged' AND {cat:id}='catalogB'
   }}
) as uniontable WHERE uniontable.catalog = 'catalogA' ORDERR BY uniontable.creationtime

【讨论】：