Setting Big Query variables like mysql

Question

what is the bigquery equivalent to mysql variables like?

SET @fromdate = \'2014-01-01 00:00:00\',  -- dates for after 2013
@todate=\'2015-01-01 00:00:00\',

         


        

Answer 1

Here is a solution using a user defined function. Declaring variables and calling them looks more like Mysql.

You can call your variables by using function var("your variable name") this way:

#standardSQL
-- Set your variables here
CREATE TEMP FUNCTION var(str STRING)
RETURNS STRING
LANGUAGE js AS """
  var result = {
    'fromdate': '2014-01-01 00:00:00',  // dates for after 2013
    'todate': '2015-01-01 00:00:00',

    'bfromdate': '2005-01-01 00:00:00', // dates for before 2013
    'btodate': '2005-01-01 00:00:00',

    'achfromdate': '2013-01-01 00:00:00', // dates for ACH without submit time in 2013
    'achtodate': '2013-01-01 00:00:00',

    'currency': 'USD',

    'minimumamount': '3.50',

    'default': 'undefined'
  };
  return result[str] || result['default'];
""";
-- Then use them by using the function var("your variable name")
SELECT *
FROM your_table
WHERE date_column BETWEEN var("fromdate") AND var("todate")

If your variable is not a string, set it as a string, call it with var and safe_cast it to your type:

#standardSQL

CREATE TEMP FUNCTION var(str STRING)
RETURNS STRING
LANGUAGE js AS """
  var result = {
    'minimumamount': '3.50',
    'default': 'undefined'
  };
  return result[str] || result['default'];
""";

SELECT *
FROM your_table
WHERE amount > safe_cast(var("minimumamount") AS FLOAT64)