当语句无法使用 args 时的雪花案例

Question

I am trying to make the select statement dependent on an args variable I am passing via a python script (in this case args.type='hello').

It looks like this:

  case when '{{type}}' = 'hello'
  then
        SELECT
        name from table1
  else
        SELECT
        city from table2 where code='usa'
  end

The error I am getting:

syntax error unexpected 'case'.
syntax error unexpected 'else'.
syntax error unexpected ')'.

I also tried IFF clause but did run into same issues.

Answer 1

If you were sending this sql to snowflake and it was failing due to a syntax error, I would expect you to get an error like "SQL compilation error: ...". Therefore I wonder if the issue isn't in your python program.

Could you share more?

Answer 2

Where you trying to set some paramters? The snowflake python connector supports several syntaxes:

format: .execute("... WHERE my_column = %s", (value,))
pyformat: .execute("... WHERE my_column = %(name)s", {"name": value})
qmark: .execute("... WHERE my_column = ?", (value,))
numeric: .execute("... WHERE my_column = :1", (value,))

If you are using python3 you can use something like f" {pythonvar} ". Could you give us more context about what you are doing?