BigQuery StandardSQL: Last 7 Days using _TABLE_SUFFIX

Question

Question: I want to pull data from multiple Google Analytics sessions tables using _TABLE_SUFFIX, but I want to set the suffix parameters to between "seven days ago" and "one day ago" (i.e. pulling data for the last 7 days)

The current syntax (that doesn't work):

#StandardSQL
SELECT
  date,
  SUM (totals.visits) AS visits
FROM
  `projectname.123456789.ga_sessions_*`
WHERE
  _TABLE_SUFFIX BETWEEN 
  'DATE_ADD(CURRENT_TIMESTAMP(), INTERVAL -7 DAY)' AND 
  'DATE_ADD(CURRENT_TIMESTAMP(), INTERVAL -1 DAY)'
GROUP BY 
   date
ORDER BY 
   date ASC

Which gives me the message "Valid: This query will process 0 B when run." To my eyes, there is no error in the syntax, but BigQuery is unable ot read my date functions and thus unable to suffix them to the ga_sessions_* wildcard

Inspiration:

BigQuery Cookbook has an example for legacySQL that I have been basing this on: (https://support.google.com/analytics/answer/4419694?hl=en#7days)

#LegacySQL
SELECT
  date,
  SUM (totals.visits) AS visits
FROM 
  (TABLE_DATE_RANGE([73156703.ga_sessions_], 
  DATE_ADD(CURRENT_TIMESTAMP(), -7, 'DAY'), 
  DATE_ADD(CURRENT_TIMESTAMP(), -1, 'DAY')))
GROUP BY
  date
ORDER BY
  date ASC 

Things I've tried: (that doesn't work)

Using DATE_SUB instead of DATE_ADD and using CURRENT_DATE instead of CURRENT_TIMESTAMP:

WHERE
   _TABLE_SUFFIX BETWEEN 
   'DATE_SUB(CURRENT_DATE(), INTERVAL 7 DAY)' AND 
   'DATE_SUB(CURRENT_DATE(), INTERVAL 1 DAY)'

Resulting in "Valid: This query will process 0 B when run."

Using DATE_FORMAT around DATE_SUB and CURRENT_DATE in order to get the dates without dashes:

WHERE
   _TABLE_SUFFIX BETWEEN 
   'FORMAT_DATE("%Y%m%d", DATE_SUB(CURRENT_DATE(), INTERVAL 7 DAY))' AND 
   'FORMAT_DATE("%Y%m%d", DATE_SUB(CURRENT_DATE(), INTERVAL 1 DAY))'

Resulting in "Valid: This query will process 0 B when run."

Tried skippingt he hyphens '' around the DATE_SUB clause

WHERE
  _TABLE_SUFFIX BETWEEN 
  DATE_SUB(CURRENT_DATE(), INTERVAL 7 DAY) AND
  DATE_SUB(CURRENT_DATE(), INTERVAL 1 DAY)

Resulting in the following error message "Error: No matching signature for operator BETWEEN for argument types: STRING, DATE, DATE. Supported signature: (ANY) BETWEEN (ANY) AND (ANY)"

Thanks in advance,

Answer 1

Elliott's answer is correct, but if you want to get the most performance out of BigQuery for such kind of query, instead of converting _TABLESUFFIX to DATE, you should convert CURRENT_DATE expressions to strings:

WHERE
  _TABLE_SUFFIX BETWEEN 
  FORMAT_DATE("%Y%m%d", DATE_SUB(CURRENT_DATE(), INTERVAL 7 DAY)) AND
  FORMAT_DATE("%Y%m%d", DATE_SUB(CURRENT_DATE(), INTERVAL 1 DAY))

Answer 2

You were almost there with your last attempt. You need to convert your string to a date in order to use it in the comparison:

WHERE
  PARSE_DATE('%Y%m%d', _TABLE_SUFFIX) BETWEEN 
  DATE_SUB(CURRENT_DATE(), INTERVAL 7 DAY) AND
  DATE_SUB(CURRENT_DATE(), INTERVAL 1 DAY)

Answer 3

This works for anyone just looking to segment out the last week of data in big query. Works for any data set as long as you have a timestamp!

where TIMESTAMPFIELD >= TIMESTAMP_SUB(CURRENT_TIMESTAMP(), INTERVAL 7 DAY)