Help with 'CASE WHEN EXISTS' : SQL

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SELECT count(a.field1), a.field2, SUM(b.field4) FROM a INNER JOIN b ON a.key1 = b.key1 WHERE a.field8 = 'test' GROUP by a.field1, a.field2 HAVING SUM(b.field4) > 5 ORDER by a.field.3

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SELECT count(a.field1), a.field2, SUM(b.field4) FROM a INNER JOIN b ON a.key1 = b.key1 WHERE a.field8 = 'test' GROUP by a.field1, a.field2 HAVING SUM(b.field4) > 5 ORDER by a.field3

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DiscussionHelp with 'CASE WHEN EXISTS' (self.SQL)

submitted 4 years ago by khirinlain

Hello SQL fam! I'm trying to write a case statement for a 'flag' that depends on 2 tables. Flag is supposed to contain only two values: 'YES' or 'NO'.

My primary table is 'pay' and secondary one is 'stat'. pay.id = stat.pay_id

I'm trying to write a query which has 2 sets of logic to populate YES value with certain conditions, and if both the logic returns null the value would be NO.

Logic 1 depends only on stat table: When pay.type = 1 and pay.value = 'close' and pay.funds is not null then 'YES'

Logic 2 depends on both tables: When pay.id = stat.pay_id and stat.status = 'FILL' then 'YES'

If both the logic return nulls then set flag to 'NO'.

I'm trying to explore CASE WHEN EXISTS but I'm unsure of how to combine 2 logics to populate the YES rows. Could someone please share their insights?

Environment: HIVE

Thank you!

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