SQL 没有公共键的水平合并

Question

我在 BigQuery 中有两个表。

表 1:

| timestamp | FIELD1 | FIELD2 | ...
| 12345678  | 000000 | 000000 | ...
| 00154789  | 000000 | 000000 | ...

表 2:

| temperature |
| 1000000000  |
| 2000000000  |

需要SELECT输出

| timestamp | temperature | FIELD1 | FIELD2 | ...
| 12345678  | 1000000000  | 000000 | 000000 | ...
| 00154789  | 2000000000  | 000000 | 000000 | ...

我想简单地将两者水平合并。两个表之间没有公共键。

谢谢。

Answer 1

参考此 site，将其发布为 Wikianswer。

您可能想尝试这些查询以获得所需的结果。

Cross-join方法：

with table1 as (
  select 12345678 as timestmp, 000000 as field1, 000000 as field2,
  union all select 00154789 as timestmp, 000000 as field1, 000000 as field2
),

table2 as (
  select 1000000000 as temperature,
  union all select 2000000000 as temperature
)

select t1.timestmp,
  t2.temperature,
  t1.field1,
  t1.field2
 from table1 t1
cross join table2 t2
where 
  (t1.timestmp = 12345678 and t2.temperature = 1000000000)
  or
  (t1.timestmp = 154789 and t2.temperature = 2000000000)

行数方法：

with table1 as (
  select 12345678 as timestmp, 000000 as field1, 000000 as field2,
  union all select 00154789 as timestmp, 000000 as field1, 000000 as field2
),

table2 as (
  select 1000000000 as temperature,
  union all select 2000000000 as temperature
),

table1_row_num as (
  select *, row_number() over (order by (timestmp))  as row_num from table1
),

table2_row_num as (
  select *, row_number() over (order by (temperature) desc)  as row_num from table2
)

select t1.timestmp,
  t2.temperature,
  t1.field1,
  t1.field2
 from table1_row_num as t1
inner join table2_row_num as t2
  on t1.row_num = t2.row_num

两个查询的输出：

SQL 没有公共键的水平合并

SQL Union horizontally without common key

sql

google-bigquery