bigquery join 疑似别名问题

Question

我对 bigquery 比较陌生，我认为我遇到了别名问题，但无法弄清楚它是什么。本质上，我有两个 table，第一个 table 包含大部分所需信息，第二个 table 包含我需要加入的出生日期。我已经编写了以下查询，并且两个初始 SELECT 语句独立工作并且看起来 return 预期值。但是，当尝试加入两个 table 时，我收到一条错误消息：

Unrecognized name: t1_teams at [10:60]

WITH table_1 AS (SELECT competition_name, stat_season_name, 
matchdata_Date, t1_teams.name, t1_players.Position, CAST(REGEXP_REPLACE(t1_players.uID, r'[a-zA-Z]', '') AS NUMERIC) AS Player_ID1, t1_players.First, t1_players.Last

FROM `prod.feed1`, 
UNNEST(teams) AS t1_teams, UNNEST(t1_teams.Players) as t1_players),

table_2 AS (SELECT t2_players.uID AS Player_ID2, t2_players.stat_birth_date
FROM `prod.feed2`,
UNNEST(players) AS t2_players)

SELECT competition_name, stat_season_name, matchdata_Date, t1_teams.name, t1_players.Position, t1_players.uID, t1_players.First, t1_players.Last, t2_players.stat_birth_date

FROM table_1
LEFT JOIN table_2
ON Player_ID1 = Player_ID2
WHERE competition_name  = "EPL"
AND stat_season_name = "Season 2018/2019"

如果我能在正确的方向上引导我，我将不胜感激，因为我对 bigquery 文档的阅读和其他搜索都是一片空白。

Answer 1

问题出在这里：

WITH table_1 AS (
  SELECT
    competition_name,
    stat_season_name, 
    matchdata_Date,
    -- this line
    t1_teams.name,
    ...

您正在 selecting t1_teams.name，因此您最终只有 name 来自 select 列表的输出列。如果你以后想参考t1_teams，那么select那就是：

WITH table_1 AS (
  SELECT
    competition_name,
    stat_season_name, 
    matchdata_Date,
    -- this line
    t1_teams,
    ...

bigquery join 疑似别名问题

Suspected alias issue in bigquery join

alias

join

google-bigquery