aggregates

Hive: Is there a way to get the aggregates of all the numeric columns existing in a table?

由 走远了吗. 提交于 2021-01-29 14:37:44
问题 I have a table containing over 50 columns (both numeric and char), is there a way to get the overall statistics without specifying each column? As an example: a b c d 1 2 3 4 5 6 7 8 9 10 11 12 Ideally I would have something like: column_name min avg max sum a 1 5 9 15 b 2 6 10 18 c 3 7 11 21 d 4 8 12 24 Nevertheless, getting one aggregate at a time it would be more more than helpful. Any help/idea would be highly appreciated. Thank you, O 回答1: You can parse DESCRIBE TABLE output using AWK

PostgreSQL Aggregates with Multiple Parameters

由 江枫思渺然 提交于 2020-01-02 03:55:11
问题 I've been trying to wrap my head around creating aggregates in PostgreSQL (either 8.4 or 9.1) that accept one or more option parameters. An example would be creating a PL/R extension to compute the p-th quantile, with 0 <= p <= 1 . This would look something like quantile(x,p) , and as part of a query: select category,quantile(x,0.25) from TABLE group by category order by category; Where TABLE (category:text, x:float) . Suggestions? 回答1: Hopefully this example will help. You need a function

“Invalid use of aggregating function in this context” in a SET query (Neo4j)

由 时光毁灭记忆、已成空白 提交于 2019-12-24 01:19:25
问题 I wonder why this is considered an invalid use of aggregate functions in Neo4j's Cypher: MATCH (p:Project)-[:EMPLOYS]-(n:Person) SET p.youngest = MIN(n.age); While the following is considered a valid use case: MATCH (p:Project)-[:EMPLOYS]-(n:Person) RETURN p.name, MIN(n.age) AS youngest; How should I rewrite the first query to make it valid? 回答1: As for "why" your original Cypher attempt does not work, and the answer by @mah does work: Cypher only permits aggregation functions to be used in

How can I “specify a dataset aggregate” in this SSRS Expression?

由 |▌冷眼眸甩不掉的悲伤 提交于 2019-12-20 01:07:30
问题 I need a row value in my SSRS report that is a calculated one based on a couple of fields that are already being used in the report. I want it to display in the textbox named 'textboxPercentageValue'. In semi-plain English, the expression/formula is: If the value of the "Week" field is "WK1", display the value of the Variance field divided by the value of the Price field; otherwise, just display the value from the Variance field. In VB script gobbledygook, the expression/formula I've add to

DDD: Aggregate Roots

由 泪湿孤枕 提交于 2019-12-18 11:35:59
问题 I need help with finding my aggregate root and boundary. I have 3 Entities: Plan, PlannedRole and PlannedTraining. Each Plan can include many PlannedRoles and PlannedTrainings. Solution 1: At first I thought Plan is the aggregate root because PlannedRole and PlannedTraining do not make sense out of the context of a Plan. They are always within a plan. Also, we have a business rule that says each Plan can have a maximum of 3 PlannedRoles and 5 PlannedTrainings. So I thought by nominating the

Domain driven design and aggregate references

由 别来无恙 提交于 2019-12-12 15:26:59
问题 I am designing the domain model, but there is something that doesn't seem to be ok. I start with a main aggregate. It has references to other aggregates and those other aggregates reference more aggregates too. I can travel the hole domain model starting from the main aggregate. The problem I see is that I will be holding all instances of aggregates in memory. Is that a good design? I can solve the memory problem with lazy loading but I think that I have a deeper problem. I have another

Kendo - Grid - Custom Aggregate in FooterTemplate

由 送分小仙女□ 提交于 2019-12-11 14:26:57
问题 My understanding is that Kendo does not support custom aggregates but you can call a function in the footerTemplate. That function then can provide calculations on the data and can even reference kendo defined aggregates. So, for example, footerTemplate: "<div><b>Range</b> #= computeRange()#</div>" If this is correct, how would you write the function computeRange? It would use max-min aggregates. Also, how would you write a computeMedian function? Thanks in advance for your help. 回答1:

How can I “specify a dataset aggregate” in this SSRS Expression?

由 末鹿安然 提交于 2019-12-01 18:37:50
I need a row value in my SSRS report that is a calculated one based on a couple of fields that are already being used in the report. I want it to display in the textbox named 'textboxPercentageValue'. In semi-plain English, the expression/formula is: If the value of the "Week" field is "WK1", display the value of the Variance field divided by the value of the Price field; otherwise, just display the value from the Variance field. In VB script gobbledygook, the expression/formula I've add to textboxPercentageValue's Value propert is: =IIF((Fields!Week.Value="WK1"), Fields!Variance.Value /

Linq - calculate multiple averages in one query

由 点点圈 提交于 2019-12-01 18:24:21
问题 I'm trying to convert some SQL queries into Linq to avoid multiple trips to the database. The old SQL I'm trying to convert does: SELECT AVG(CAST(DATEDIFF(ms, A.CreatedDate, B.CompletedDate) AS decimal(15,4))), AVG(CAST(DATEDIFF(ms, B.CreatedDate, B.CompletedDate) AS decimal(15,4))) FROM dbo.A INNER JOIN dbo.B ON B.ParentId = A.Id So I've created two C# classes: class B { public Guid Id { get; set; } public DateTime CreatedDate { get; set; } public DateTime CompletedDate { get; set; } } class

DDD: Aggregate Roots

由 我的梦境 提交于 2019-11-30 04:04:57
I need help with finding my aggregate root and boundary. I have 3 Entities: Plan, PlannedRole and PlannedTraining. Each Plan can include many PlannedRoles and PlannedTrainings. Solution 1: At first I thought Plan is the aggregate root because PlannedRole and PlannedTraining do not make sense out of the context of a Plan. They are always within a plan. Also, we have a business rule that says each Plan can have a maximum of 3 PlannedRoles and 5 PlannedTrainings. So I thought by nominating the Plan as the aggregate root, I can enforce this invariant. However, we have a Search page where the user
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