Ruby Sequel 子查询发生在主查询之前

Question

有人可以帮我解决这个问题吗？

我需要将以下 sql 代码翻译成 sequel:

SELECT DISTINCT sales_leads.employee_person_id,
    (SELECT full_name from persons 
        WHERE sales_leads.employee_person_id=persons.id),
    (SELECT COUNT (sales_leads.id) from sales_leads 
        WHERE sales_leads.employee_person_id=employees.person_id 
        AND sales_leads.status='open') AS open_leads_count,
    (SELECT COUNT (sales_leads.id) from sales_leads 
        WHERE sales_leads.employee_person_id=employees.person_id 
        AND sales_leads.status='lost' OR sales_leads.status='won') AS closed_leads_count
FROM sales_leads
JOIN employees ON sales_leads.employee_person_id=employees.person_id
ORDER BY sales_leads.employee_person_id;

这是我目前拥有的：

DB[:sales_leads]
  .inner_join(:persons, id: :employee_person_id)
  .select(:full_name)
  .select_append(
    DB[:sales_leads]
      .select(:id)
      .where(Sequel[:sales_leads][:employee_person_id]=>Sequel[:persons][:id])
      .count
  ).all

但是我得到一个错误：

PG::UndefinedTable: ERROR: missing FROM-clause entry for table "persons" LINE 1: ...eads" WHERE ("sales_leads"."employee_person_id" = "persons".... ^: SELECT count(*) AS "count" FROM "sales_leads" WHERE ("sales_leads"."employee_person_id" = "persons"."id") LIMIT 1 Sequel::DatabaseError: PG::UndefinedTable: ERROR: missing FROM-clause entry for table "persons" LINE 1: ...eads" WHERE ("sales_leads"."employee_person_id" = "persons".... ^ from /home/john/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/sequel-5.5.0/lib/sequel/adapters/postgres.rb:145:in `async_exec'

Answer 1

您在传递给 select_append 调用的数据集上调用 Dataset#count，并且 Dataset#count 运行查询。你可能想要 .select{count(sales_leads[:id])} 而不是 .count.

Ruby Sequel 子查询发生在主查询之前

Ruby Sequel Subquery Happening Before Main Query

ruby

sql

ruby-on-rails

sequel