Organizing data into multiple columns SQL - sql

Question

I have a table of more than 5m customers with historic activity data as in example below:
Customer ID
PART_ID
Activity
12345
202012
2
12345
202101
0
12345
202102
5
I want to convert this data into multiple columns; customers at the rows, dates in the columns and their respective activity info.
I wrote the code below but instead of creating a single row for a single customer, customers duplicate and I get a table like this:
Customer ID
202012
202101
202102
12345
1
0
0
12345
0
0
0
12345
0
0
1
Instead of:
Customer ID
202012
202101
202102
12345
1
0
1
What am I doing wrong?
SELECT *
FROM
(
SELECT CUST_ID, RULLED_PROFIT_CENTER,
CASE WHEN PART_ID = 202012 AND ACTIVITY > 0 THEN 1 ELSE 0 END AS ARA_20,
CASE WHEN PART_ID = 202101 AND ACTIVITY > 0 THEN 1 ELSE 0 END AS OCA_21,
CASE WHEN PART_ID = 202102 AND ACTIVITY > 0 THEN 1 ELSE 0 END AS SUB_21,
CASE WHEN PART_ID = 202103 AND ACTIVITY > 0 THEN 1 ELSE 0 END AS MAR_21,
CASE WHEN PART_ID = 202104 AND ACTIVITY > 0 THEN 1 ELSE 0 END AS NIS_21,
CASE WHEN PART_ID = 202105 AND ACTIVITY > 0 THEN 1 ELSE 0 END AS MAY_21,
CASE WHEN PART_ID = 202106 AND ACTIVITY > 0 THEN 1 ELSE 0 END AS HAZ_21,
CASE WHEN PART_ID = 202107 AND ACTIVITY > 0 THEN 1 ELSE 0 END AS TEM_21,
CASE WHEN PART_ID = 202108 AND ACTIVITY > 0 THEN 1 ELSE 0 END AS AGU_21,
CASE WHEN PART_ID = 202109 AND ACTIVITY > 0 THEN 1 ELSE 0 END AS EYL_21
FROM ACTIVITY
WHERE RULLED_PROFIT_CENTER IN (108, 103, 170)
GROUP BY CUST_ID, RULLED_PROFIT_CENTER
)
WHERE ARA_20 + OCA_21 + SUB_21 + MAR_21 + NIS_21 + MAY_21 +
HAZ_21 + TEM_21 + AGU_21 + EYL_21 > 0

Answer 1

WHERE RULLED_PROFIT_CENTER IN (108, 103, 170)
GROUP BY CUST_ID, RULLED_PROFIT_CENTER
You're grouping by two values, the customer and RULLED_PROFIT_CENTER. RULLED_PROFIT_CENTER can have three possible values, so you're going to get up to three rows per customer. If you want only one row per customer, remove RULLED_PROFIT_CENTER from your group by.
It's possible you added RULLED_PROFIT_CENTER to the group by because the query didn't work without it. If you want to include RULLED_PROFIT_CENTER in your select, but not your group by, you need to aggregate RULLED_PROFIT_CENTER as well. Even if each customer only has one value for it. Use string_agg.
SELECT CUST_ID, string_agg(RULLED_PROFIT_CENTER, ', ')
If a customer has only one value for RULLED_PROFIT_CENTER you'll get just that one value.
Since you're grouping all the rows of a customer together, you will need to take the max of your activities.
MAX( CASE WHEN PART_ID = 202012 AND ACTIVITY > 0 THEN 1 ELSE 0 END ) AS ARA_20