Snowflake - 通过自定义名称引用列组

Question

Say I have

CREATE TABLE "test-table" (
  "field1" TEXT,
  "field2" TEXT,
  "field3" TEXT,
  ...
  "field60" TEXT)

and I want to insert 30 fields from another table, and 30 fields from another.

I would do this running

insert into "test-table"(field1,...,field30)
  select
    field1,field2,...,field30
  from "another-table"

In both situations I've used the same long list of fields, can I denote this by a custom object? Like fieldlist = [field1,field2,...,field30] and then run commands like insert into "test-table"(fieldlist) to tidy up the SQL?

Answer 1

Hi @Christopher Turnbull, Snowflake follows ANSI SQL 1999 and SQL 2003, and hence it has to be a standard approach to insert data in snowflake. You could achieve this using a stored procedure, however, snowflake does not have any such object which could get this done.

You can submit a feature request to snowflake as your requirement looks interesting.

Answer 2

You could refactor this code by creating a SQL UDF. For example, if you want to insert the number 7 in a table with many columns:

insert into many_cols
select * from table(to_many_cols(7));

The definition of that function would be something like:

create or replace function to_many_cols(b int) 
returns table(a string, b int, c string, d number, e float)
as $$
select null, b, null, null, null
$$;

Which would work on a table like:

create temp table many_cols (a string, b int, c string, d number, e float);