设置 Big Query 变量，如 mysql

Setting Big Query variables like mysql(设置 Big Query 变量，如 mysql)

问题描述

相当于mysql变量的bigquery是什么样的?

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',

@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";

推荐答案

您现在可以在 BigQuery 中使用变量.要运行您提供的语句，您需要使用 DECLARE:

You can now use variables in BigQuery. To run the statements that you provided, you need to use DECLARE:

DECLARE fromdate TIMESTAMP DEFAULT '2014-01-01 00:00:00';  -- dates for after 2013
DECLARE todate TIMESTAMP DEFAULT '2015-01-01 00:00:00';

DECLARE bfromdate TIMESTAMP DEFAULT '2005-01-01 00:00:00'; -- dates for before 2013
DECLARE btodate TIMESTAMP DEFAULT '2005-01-01 00:00:00';

DECLARE achfromdate TIMESTAMP DEFAULT '2013-01-01 00:00:00'; -- dates for ACH without submit time in 2013
DECLARE achtodate TIMESTAMP DEFAULT '2013-01-01 00:00:00';

DECLARE currency STRING DEFAULT "USD";

您可以在声明变量后在语句中使用变量，例如:

You can use variables in statements after declaring them, e.g.:

DECLARE fromdate TIMESTAMP DEFAULT '2014-01-01 00:00:00';  -- dates for after 2013
DECLARE todate TIMESTAMP DEFAULT '2015-01-01 00:00:00';

SELECT FORMAT('From %t to %t', fromdate, todate);

另请参阅脚本文档.

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