[英]how to dynamically join tables in bigquery to avoid duplication of common columns
I have 2 tables with a large number of columns (each has around 700-800 columns, which makes it not feasible to individually write all the column names).我有 2 个包含大量列的表(每个表大约有 700-800 列,这使得单独编写所有列名不可行)。 Both the tables have a few common rows.
这两个表都有一些共同的行。 I need to dynamically union both the tables such that the common columns don't get repeated and are queried only once in the final table.
我需要动态合并这两个表,这样公共列就不会重复,并且在最终表中只被查询一次。 For example:
例如:
TABLE 1:
+---------+--------+------+-------+
|firstname|lastname|upload|product|
+---------+--------+------+-------+
| alice| a| 100|apple |
| bob| b| 23|orange |
+---------+--------+------+-------+
TABLE 2:表 2:
+---------+--------+------+-------+
|firstname|lastname|books |active |
+---------+--------+------+-------+
| alice| a| 10 |yes |
| bob| b| 2 |no |
+---------+--------+------+-------+
FINAL TABLE:决赛桌:
+---------+--------+------+-------+-----+------+
|firstname|lastname|upload|product|books|active|
+---------+--------+------+-------+-----+------+
| alice| a| 100|apple | 10 | yes |
| bob| b| 23|orange | 2 | no |
+---------+--------+------+-------+-----+------+
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