SQL 具有内部连接和 where between 的复杂查询

Question

我无法理解为什么我的查询不起作用并且我已经搜索了现有主题。 我的目标 我正在尝试显示我 MySQL.

中选定时间段内排名前 5 位的投诉类型

预期结果 table 5 行，第一列显示 COUNT，第二列显示我的票证类型的描述

查询我正在使用哪个returns错误

SELECT
  COUNT(t.ticketType) AS total_amount, 
  tt.typeTekst AS description
  FROM Ticket t
  WHERE t.ticketStartTime BETWEEN 1612443540 AND 1613393340
  INNER JOIN TicketType tt ON t.ticketType = tt.typeId
  GROUP BY description
  ORDER BY total_amount desc
  LIMIT 5

类似的查询有效 - 但不符合我的期望

Table 没有正确的机票描述

SELECT
  COUNT(t.ticketType) AS total_amount, 
  t.ticketType AS description
  FROM Ticket t
  WHERE t.ticketStartTime BETWEEN 1612443540 AND 1613393340
  GROUP BY description
  ORDER BY total_amount desc
  LIMIT 5

total_amount	description
4	7
3	6
2	10
2	5
1	30

Table 没有选择的时间段，但是有描述

SELECT
  COUNT(t.ticketType) AS total_amount,
  tt.typeDescription AS description
  FROM Ticket t
  INNER JOIN TicketType AS tt ON t.ticketType = tt.typeId 
  GROUP BY description
  ORDER BY total_amount desc
  LIMIT 5

total_amount	description
31	TicketType Placeholder A
10	TicketType Placeholder B
8	TicketType Placeholder C
5	TicketType Placeholder D
4	TicketType Placeholder E

感谢您的宝贵时间！

Answer 1

连接所有表后使用where子句。请尝试以下查询：

SELECT
  COUNT(t.ticketType) AS total_amount, 
  tt.typeTekst AS description
  FROM Ticket t
  INNER JOIN TicketType tt ON t.ticketType = tt.typeId
  WHERE t.ticketStartTime BETWEEN 1612443540 AND 1613393340
  GROUP BY description
  ORDER BY total_amount desc
  LIMIT 5

SQL 具有内部连接和 where between 的复杂查询

SQL Complex query with inner join and where between

mysql

sql

join

group-by

where-clause

查询我正在使用哪个returns错误

类似的查询有效 - 但不符合我的期望