FULL OUTER JOIN throwing error "wrap select in parentheses" - sql

Question

I am having trouble with a part of my SQL call, I receive this error
Error: Syntax error: Each subquery argument for table-valued function calls must be enclosed in parentheses. To fix this, replace SELECT... with (SELECT...) at [32:5]
This is at the SELECT after the FULL OUTER JOIN EACH, I'd argue that I have done that, I do not know what is wrong here so any suggestions would be much appriciated.
I am trying to create a funnel that more acurately sorts previous customers from new. There are in total 3 levels in the funnel, for "simplicity" I'll only show two.
SELECT
COUNT(s0.firstHit) AS pageId1,
SUM(s0.exit) AS pageId2,
COUNT(s1.firstHit) AS pageId3,
SUM(s1.exit) AS pageId4
FROM(
SELECT
s0.fullVisitorId,
s0.visitId,
s0.firstHit,
s0.exit,
s1.firstHit,
s1.exit
FROM (
SELECT
fullvisitorid,
visitid,
(SELECT MIN(hitNumber) FROM UNNEST(hits) WHERE REGEXP_CONTAINS(page.pagePath, r'pageId')) AS firstHit,
(SELECT MAX(IF(isExit, 1, 0)) FROM UNNEST(hits) WHERE REGEXP_CONTAINS(page.pagePath, r'pageId')) AS exitFlag
FROM
`<ID>.ga_sessions_2017*`
WHERE
_TABLE_SUFFIX BETWEEN '0601' AND '0602'
AND 1 = 1
AND EXISTS(SELECT 1 FROM UNNEST(hits) WHERE REGEXP_CONTAINS(page.pagePath, r'pageId'))
AND EXISTS(SELECT 1 FROM UNNEST(hits) hits WHERE (SELECT COUNT(value) FROM UNNEST(hits.customDimensions) custd WHERE index=20) > 0)
AND totals.visits = 1
GROUP BY
fullVisitorId,
visitId) AS s0
FULL OUTER JOIN EACH(
SELECT
fullVisitorId,
visitId,
(SELECT MIN(hitNumber) FROM UNNEST(hits) WHERE REGEXP_CONTAINS(page.pagePath, 'pageId')) AS firstHit,
(SELECT MAX(IF(isExit, 1, 0)) FROM UNNEST(hits) WHERE REGEXP_CONTAINS(page.pagePath, 'pageId')) AS exitFlag
FROM
`<ID>.ga_sessions_2017*`
WHERE
_TABLE_SUFFIX BETWEEN '0601' AND '0602'
AND totals.visits = 1
GROUP BY
fullVisitorId,
visitId) AS s1
ON
s0.fullVisitorId = s1.fullVisitorId
AND s0.visitId = s1.visitId ) s01

Answer 1

You can find ways to write this query and not having the JOIN operations going on.
For instance:
SELECT
fullvisitorid,
visitid,
(SELECT MIN(hitNumber) FROM UNNEST(hits) WHERE REGEXP_CONTAINS(page.pagePath, r'pageId')) AS firstFunnelHit,
(SELECT MAX(IF(isExit, 1, 0)) FROM UNNEST(hits) WHERE REGEXP_CONTAINS(page.pagePath, r'pageId')) AS firstExitFunnelFlag,
(SELECT MIN(hitNumber) FROM UNNEST(hits) WHERE (REGEXP_CONTAINS(page.pagePath, r'pageId')) OR ((select count(1) from unnest(hits) h, unnest(h.customDimensions) custd where custd.index = 20) > 0)) secondFunnelHit,
(SELECT MAX(IF(isExit, 1, 0)) FROM UNNEST(hits) WHERE REGEXP_CONTAINS(page.pagePath, r'pageId') OR ((select count(1) from unnest(hits) h, unnest(h.customDimensions) custd where custd.index = 20) > 0)) AS secondFunnelExitFlag
FROM `dataset.ga_sessions_2017*`
WHERE 1 = 1
AND _TABLE_SUFFIX BETWEEN '0601' AND '0602'
AND totals.visits = 1
Notice that in just one SELECT you can bring information regarding all visitors who have been in page "pageId" and also visitors who have been in this page and fired the customDimension on index=20.
For each step in your funnel analyzes you can bring new columns as results, such as the firstFunnelHit and secondFunnelHit.
By avoiding expensive JOINs you can query up to teras of data and still have results in seconds.

Answer 2

In the last subquery:
SELECT
fullVisitorId,
visitId
(SELECT MIN(hitNumber) FROM UNNEST(hits) WHERE REGEXP_CONTAINS(page.pagePath, 'pageId')) AS firstHit,
(SELECT MAX(IF(isExit, 1, 0)) FROM UNNEST(hits) WHERE REGEXP_CONTAINS(page.pagePath, 'pageId')) AS exitFlag
FROM
`<ID>.ga_sessions_2017*`
WHERE
_TABLE_SUFFIX BETWEEN '0601' AND '0602'
AND totals.visits = 1
GROUP BY
fullVisitorId,
visitId
it looks to me like you need a comma after visitId in the third line.
Best of luck.

Answer 3

There is no EACH keyword when using standard SQL; this is specific to legacy SQL. Remove that word and your query will probably work.