Dreamfactory : How to use MySQL aggregate functions in queries

Dreamfactory : How to use MySQL aggregate functions in queries

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Dreamfactory : How to use MySQL aggregate functions in queries
Tag : mysql , By : Don Changer
Date : November 29 2020, 09:01 AM

will be helpful for those in need There are a few things to note. The "SELECT" fields can not contain function calls, but starting with version 2.0.2, DreamFactory supports virtual fields. Create vcol2 to be "HOUR(col2)" and vcol1 to be "MAX(col1)-MIN(col1)" then use them in your field parameter.
As for the filter error, there is a bug in the parsing that is fixed in the 2.0.3 build coming out next week (12/21), but all function calls must be surrounded by parens, i.e. "col3 = (CURDATE())".
GET http://server/api/v2/service/_table/table_name?filter=col3%20%3D%20(CURDATE())&group=col3&fields=vcol2,vcol1

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Why does MySQL allow "group by" queries WITHOUT aggregate functions?

Tag : mysql , By : user109127
Date : March 29 2020, 07:55 AM
it fixes the issue I believe that it was to handle the case where grouping by one field would imply other fields are also being grouped:
SELECT user.id, user.name, COUNT(post.*) AS posts 
FROM user 
  LEFT OUTER JOIN post ON post.owner_id=user.id 
GROUP BY user.id

Is it possible to use queries within aggregate functions?

Tag : sql , By : user105769
Date : March 29 2020, 07:55 AM
should help you out Is the following acceptable in SQL: , Syntactically, I would have written it like this:
SELECT P.pid, P.cnt
  FROM Professors P
  WHERE P.cnt <= (SELECT MAX(P2.cnt) FROM Professors P2)

PostgreSQL: sub-queries and aggregate functions(Sum)

Tag : sql , By : Lathentar
Date : March 29 2020, 07:55 AM
this will help I tried referring to other questions; I've inferred that sub-queries cannot be used on aggregate functions, but I cannot solve this use case.
  c.name as customer_name,
  sum(coalesce(p.price, 0) * coalesce(pr.quantity, 0)) as amount_purchased
  CustomerInfo c
  left join PurchaseRecords pr on c.c_id = pr.c_id
  left join ModelInfo mi on mi.m_id = pr.m_id
  left join ProductInfo p on p.p_id = mi.p_id
group by

MySQL - Index to speed up queries with aggregate functions

Tag : mysql , By : user177837
Date : March 29 2020, 07:55 AM

MarkLogic: Using aggregate functions in SPARQL queries

Tag : development , By : user186876
Date : March 29 2020, 07:55 AM
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