PL/SQL-How 当表和条件都不同时，在单个查询中实现多个计数语句

Question

我正在开发使用 PL/SQL 数据库的开放文本内容服务器工具。我想做的是通过 6 个不同的查询来获取计数数据，这些查询都有不同的条件和不同的表。我试图将所有这 6 个计数查询结合起来，但没有成功。下面是列出的 6 个查询：

一个月内创建的文档：

select count (dataid) from Dtree where 
Createdate >= %1 and createdate <= %2 and subtype = 144

用户总数：

select count(a.id) from Kuaf a, kuaf b where 
a.deleted =0 and a.type =0 and b.id = a.groupid

一个月内登录的唯一用户数（计数）：

Select count (distinct (performerID))
from dauditnew where auditid=23 and auditdate >= %1 and auditdate <= %2

一个月内创建的用户数（计数）：

Select Count(dataid) FROM DAUDITNEW where AUDITID = 1 
AND AUDITSTR LIKE 'Create' and subtype=142 AND 
auditdate >= %1 and auditdate <= %2

已删除的用户（计数）：

SELECT count(a.userid) from dauditnew a WHERE
a.auditstr = 'Delete' AND 
a.AuditDate >= %1 AND 
a.AuditDate <= %2 AND 
a.UserID in (Select ID from KUAF where Deleted = 1 and Type=0)

启动的工作流程：

Select count(*) from Wworkaudit WWA where WWA.workaudit_status=1 AND 
WWA.workaudit_date >= %1 and WWA.workaudit_date <= %2

这里的 %1,%2 表示用户输入。由于这 6 个查询都有非常不同的条件，因此将它们组合起来对我来说似乎是一项艰巨的任务。请帮帮我。

谢谢。

Answer 1

使用 UNION ALL 语句

例如。 select 计数 (a.x) 来自...哪里... 联合所有 select 计数 (b.z) 从 b...哪里... 联合所有 select count (c.y) 来自 c...where... 等等

注意：您必须使用 UNION ALL，因为如果您使用常规 UNION，将不会显示重复的结果

Answer 2

SELECT (
         select count (dataid)
         from   Dtree
         where  Createdate BETWEEN :start_date and :end_date
         and    subtype = 144
       ) AS Docs_Per_Month,
       (
         select count(a.id)
         from   Kuaf a INNER JOIN kuaf b ON (b.id = a.groupid)
         where  a.deleted = 0
         and    a.type    = 0
       ) AS Total_No_of_Users,
       (
         Select count( distinct performerID )
         from   dauditnew
         where  auditid = 23
         and    auditdate BETWEEN :start_date and :end_date
       ) AS Unique_Users_in_Month,
       (
         Select Count(dataid)
         FROM   DAUDITNEW
         where  AUDITID  = 1 
         AND    AUDITSTR = 'Create'
         and    subtype  = 142
         AND    auditdate BETWEEN :start_date and :end_date
       ) AS Users_Created_in_Month,
       (
         SELECT count(a.userid)
         from   dauditnew a
         WHERE  a.auditstr = 'Delete'
         AND    a.auditdate BETWEEN :start_date and :end_date
         AND    a.UserID in (Select ID from KUAF where Deleted = 1 and Type=0)
       ) AS Users_Deleted,
       (
         Select count(*)
         from   Wworkaudit
         where  workaudit_status = 1
         AND    workaudit_date BETWEEN :start_date and :end_date
       ) AS Workflows_Initiated
FROM   DUAL;

PL/SQL-How 当表和条件都不同时，在单个查询中实现多个计数语句

PL/SQL-How to implement multiple count statements in a single query when tables and conditions are all different

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