Optimize SQL: How to rewrite this query to boost performance? (Use subqueries, get rid of GROUP BY?)

Currently, I have a query like this: SELECT h.org_id, h.org_name, h.product_id, h.product_name, p.component_id, p.component_name, i.transaction_id, i.customer_name, sum(CASE WHEN i.transaction_name = ‘TEST’ THEN i.quantity END) AS records, sum(i.unit_price * i.quantity) AS cost FROM invoice i LEFT JOIN transaction t ON i.transaction_id = t.transaction_id JOIN hierarchy h ON t.product_id = h.product_id JOIN product p ON t.product_id =…

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Where the error and how to avoid false-character errors

SYNTAX ERROR (please copy/paste to see) x = { “0”​:​”G”​, “1”:”H” } Tested on line interpreter: >>> x = { … “0”​:​”G”​ File “<stdin>”, line 2 “0”​:​”G”​ ^ SyntaxError: invalid syntax But this other (seems the same!) is fine, (please copy/paste to see) x = { “0”:”G”, “1”:”H” } The real-life dictionary is longer and…

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how to use m4ri on MSVS?

I want to use the library ‘m4ri’ (https://bitbucket.org/malb/m4ri/src/master/) on vs2017. I compiled the lib in both release and debug mode successfully. When I started a new project to run the ‘test_elimination.c’ (this file is given by the designers of this package), it will always report the ‘read violation’ error. Is there a solution for this?…

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