根据join和case插入sqlite数据

Question

我有 2 tables：weekly_scores 和 team 在 sqlite 数据库中（SQLite 版本 3.32 .2)

Weekly_scores 有 team_id 和 goal_differential 包含进球数那个星期球队赢了。团队有 team.id 不同的团队
我想根据赛季中的最大获胜进球数对球队 table 中的球队进行分类。
- 如果 goal_differential < 2，则 team.skill = 低
- 如果goal_differential>=2，则team.skill=高

我想 return weekly_scores table 中每支球队的最大进球差值并分类 根据上述标准，团队 table 中的技能。

我的代码基于 and this website

insert into team(skill)
values(
case 
    select max(weekly_scores.goal_differential) as max_count
    from weekly_scores
    left join team
    on weekly_scores.team_id = team.id
    where weekly_scores.goal_differential is not NULL
    group by team.id;
when max_count < 2 then team.skill = low
when max_count >= 2 then team.skill = high
end);

我收到以下错误

Result: near "select": syntax error  
At line 8:  
insert into team(skill)  
values(  
case   
    select

任何帮助都会很棒！

Answer 1

你可以试试这样插入select

insert into team(id, skill)
select t.id
, case when t.max_count < 2 then 'low' else 'high' end 
from (
    select team.id, max(weekly_scores.goal_differential) as max_count
    from weekly_scores
    left join team
    on weekly_scores.team_id = team.id
    where weekly_scores.goal_differential is not NULL
    group by team.id
) t

Answer 2

您需要更新 table team 而不是插入新行。
使用相关子查询：

update team 
set skill = coalesce(
  (
    select case when max(w.goal_differential) < 2 then 'low' else 'high' end 
    from weekly_scores w
    where w.team_id = team.id and w.goal_differential is not NULL 
  ), 
  skill
)

根据join和case插入sqlite数据

Inserting sqlite data based on join and case

sql

sqlite

select

join

case