BigQuery - Scalar subquery produced more than one element - - sql

Question

I have this query that helps me to find separate key words within strings (very useful with utm_campaign and utm_content):
SELECT
utm_campaign,
splits[SAFE_OFFSET(0)] AS country,
splits[SAFE_OFFSET(1)] AS product,
splits[SAFE_OFFSET(2)] AS budget,
splits[SAFE_OFFSET(3)] AS source,
splits[SAFE_OFFSET(4)] AS campaign,
splits[SAFE_OFFSET(5)] AS audience
FROM (
SELECT
utm_campaign,
SPLIT(REGEXP_REPLACE(
utm_campaign,
r'([^_]+)_([^_]+)_([^_]+)_([^_]+)_([^_]+)_([^_]+)_(.+)',
r'\1|\2|\3|\4|\5|\6|\7'),
'|') AS splits
FROM funnel_campaign)
For example: if I have a umt_campaign like this:
us_latam_mkt_google_black-friday_audiencie-custom_NNN-NNN_nnn_trafic_responsiv
The query from above will help me to separate each word with a _ in between. So I'll have a result like this:
utm_campaign
country
product
budget
source
campaign
audience
us_latam_mkt_google_black-friday_audiencie-custom_NNN-NNN_nnn_trafic_responsiv
us
latam
mkt
google
black-friday
audience-custom
What I want from the query from above is to give me in this case the audience column. I tried to add the query from above as a sub-query on this query in REVENUE because in this table I don't have the audience column but I have the utm_campaign column. Inside the utm_campaign string, the sixth fragment is the audience (with this query I have the error "Scalar subquery produced more than one element"):
WITH COST AS (
SELECT
POS AS POS,
DATE AS DATE,
EXTRACT(WEEK FROM DATE) AS WEEK,
SOURCE AS SOURCE,
MEDIUM AS MEDIUM,
CAMPAIGN AS CAMPAIGN,
AD_CONTENT,
FORMAT AS FORMAT,
"" AS BU_OD,
SUM(CLICKS)/1000 AS CLICKS,
SUM(IMPRESSIONS)/1000 AS IMPRESSIONS,
SUM(COST)/1000 AS COST,
sum(0) as SESSIONS,
SUM(0) AS TRANSACTIONS,
SUM(0) AS search_flight_pv,
SUM(0) AS search_flight_upv,
SUM(0) AS PAX,
SUM(0) AS REVENUE,
FROM MSR_funnel_campaign_table
WHERE DATE >= DATE '2019-01-01'
AND MEDIUM NOT LIKE 'DISPLAY_CORP'
GROUP BY 1,2,3,4,5,6,7,8,9
),
REVENUE AS(
SELECT
POS AS POS,
date AS DATE,
EXTRACT(WEEK FROM DATE) AS WEEK,
SOURCE_CAT AS SOURCE,
medium_group_2 AS MEDIUM,
CAMPAIGN AS CAMPAIGN,
AD_CONTENT,
CASE
WHEN SOURCE_CAT = 'FACEBOOK' THEN
(
SELECT
splits[SAFE_OFFSET(5)] AS FORMAT,
FROM (
SELECT
ad_content,
SPLIT(REGEXP_REPLACE(
ad_content,
r'([^_]+)_([^_]+)_([^_]+)_([^_]+)_([^_]+)_([^_]+)_(.+)',
r'\1|\2|\3|\4|\5|\6|\7'),
'|') AS splits
FROM ga_digital_marketing)) END AS FORMAT,
BU_OD AS BU_OD,
SUM(0) AS CLICKS,
SUM(0) AS IMPRESSIONS,
SUM(0) AS COST,
sum(sessions)/1000 as SESSIONS,
SUM(TRANSACTIONS)/1000 AS TRANSACTIONS,
SUM(search_flight_pv)/1000 AS search_flight_pv,
SUM(search_flight_upv)/1000 AS search_flight_upv,
SUM(PAX)/1000 AS PAX,
SUM(REVENUE)/1000 AS REVENUE,
FROM ga_digital_marketing
WHERE PAX_TYPE = 'PAID'
AND DATE >= DATE '2019-01-01'
AND MEDIUM NOT LIKE 'DISPLAY_CORP'
GROUP BY 1,2,3,4,5,6,7,8,9
),
COST_REVENUE AS (
SELECT *
FROM COST
UNION ALL
SELECT *
FROM REVENUE
)
SELECT
DATE,
WEEK,
POS,
SOURCE,
MEDIUM,
CAMPAIGN,
AD_CONTENT,
FORMAT,
BU,
CLICKS,
IMPRESSIONS,
SESSIONS,
TRANSACTIONS,
search_flight_pv,
search_flight_upv,
COST,
PAX,
REVENUE,
FROM COST_REVENUE
WHERE
1=1
AND DATE >= '2019-01-01'
What am I doing wrong here?
What I would like too see is having a match between the format dimension from COST and the format dimension from REVENUE (which it doesn't exists, but it is within the campaign column).

Answer 1

You don't really need the interior select statements as your campaign data should be in the same row of the table.
Change this:
CASE
WHEN SOURCE_CAT = 'FACEBOOK' THEN
(
SELECT
splits[SAFE_OFFSET(5)] AS FORMAT,
FROM (
SELECT
ad_content,
SPLIT(REGEXP_REPLACE(
ad_content,
r'([^_]+)_([^_]+)_([^_]+)_([^_]+)_([^_]+)_([^_]+)_(.+)',
r'\1|\2|\3|\4|\5|\6|\7'),
'|') AS splits
FROM ga_digital_marketing)) END AS FORMAT,
to something like this:
-- also replacing case with if for only 1 case
IF(SOURCE_CAT = 'FACEBOOK',
SPLIT(REGEXP_REPLACE(
ad_content,
r'([^_]+)_([^_]+)_([^_]+)_([^_]+)_([^_]+)_([^_]+)_(.+)',
r'\1|\2|\3|\4|\5|\6|\7'),
'|')[SAFE_OFFSET(5)], NULL) AS FORMAT,