Big Query SQL sum values based on conditions - sql

Question

I have a query where I am trying to combine tables and sum results based on a combination of two columns. I want to combine the group from table 2 and 3 to be matched with the name and count of table 1. Then, the count should be summed so each name is listed once. However, IF a person worked are group UU AND group Z, THEN he/she should needs to have their group Z count listed separately from their group UU count. This person would be listed twice if they worked as group Z and UU. I need to split out results based on a specific condition (the combination of Portal and Group in the example below)
Table 1
+--------+------+-------+
| Portal | Name | Count |
+--------+------+-------+
| A | Bob | 3 |
| A | Joe | 6 |
| B | Joe | 6 |
| B | Bob | 2 |
| C | Bob | 5 |
+--------+------+-------+
Table 2
+-------+------+
| Group | Name |
+-------+------+
| Z | Bob |
| Y | Joe |
+-------+------+
Table 3
+-------+------+
| Group | Name |
+-------+------+
| UU | Bob |
| UU | Jill |
+-------+------+
Output
+-------+------+-------+
| Group | Name | Count |
+-------+------+-------+
| Z | Bob | 8 |
| UU | Bob | 2 |
| Y | Joe | 12 |
+-------+------+-------+
Notice that Bob's Portal B gets counted separately because he is in Group UU. Group UU only works in portal B. Bob's Portal A and C gets summed together because he is group Z in those Portals. Meanwhile Joe gets all of his count summed in a single row because he is not UU at all. Thanks in advance for any insight.

Answer 1

Below is for BigQuery Standard SQL
Try below
#standardSQL
WITH table1 AS (
SELECT 'A' portal, 'Bob' name, 3 cnt UNION ALL
SELECT 'A', 'Joe', 6 UNION ALL
SELECT 'B', 'Joe', 6 UNION ALL
SELECT 'B', 'Bob', 2 UNION ALL
SELECT 'C', 'Bob', 5
), table2 AS (
SELECT 'Z' grp, 'Bob' name UNION ALL
SELECT 'Y', 'Joe'
), table3 AS (
SELECT 'UU' grp, 'Bob' name UNION ALL
SELECT 'UU', 'Jill'
), all_groups AS (
SELECT * FROM table2 UNION ALL
SELECT * FROM table3
)
SELECT grp, name,
SUM(
CASE
WHEN grp = 'UU' THEN
CASE WHEN portal = 'B' THEN cnt ELSE 0 END
WHEN grp != 'UU' AND flag THEN
CASE WHEN portal = 'B' THEN 0 ELSE cnt END
ELSE cnt
END
) cnt
FROM (
SELECT a.grp, a.name, b.portal, b.cnt,
0 != COUNTIF(grp = 'UU') OVER(PARTITION BY a.name) flag
FROM all_groups a
JOIN table1 b
ON a.name = b.name
)
GROUP BY grp, name
with output
Row grp name cnt
1 Z Bob 8
2 UU Bob 2
3 Y Joe 12

Answer 2

I think you are trying to use a different mapping table depending on the value of the portal. If so, you can do:
select
case when portal = 'B' then t3.group else t2.group end as grp,
t1.name,
sum(count) cnt
from table1 t1
inner join table2 t2 on t2.name = t1.name
inner join table3 t2 on t2.name = t1.name
group by 1, 2
If you may have missing records in any of the group table, then use left join instead.