JOIN With GROUPBY | How to join tables with groupby | How to use groupby when joining multiple table

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The SQL GROUP BY Statement
The GROUP BY statement groups rows that have the same values into summary rows, like "find the number of customers in each country".
The GROUP BY statement is often used with aggregate functions (COUNT, MAX, MIN, SUM, AVG) to group the result-set by one or more columns.

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can we use inner join in this ? or we will get wrong result on using inner join ?

vwpztgt
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Can i use group by subscriber_id
Instead of group by 1, 2, 3, 4

bbom
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you still didn't solve bro. haha there is still an error. wtf !

gerbmanalo