aggregate-functions

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Selecting the no of rows from the database using the year stored in date field

Can any one help me get the total # of records from a database table, using year? I have a table - in that I saved the exam date in a date field.I need to get the total # of records from that table u[详细]

2023-03-31 01:16 分类：问答
Trying to pull a variable only on row with max(date) while summing a different variable on all rows

I need to pull a value from the row that has the maximum date, while also summing all the values of a different column.[详细]

2023-03-30 16:02 分类：问答
Cannot be used in the PIVOT operator because it is not invariant to NULLs

I create an aggregate function for string column in SQL Server 2008. C# code look like this: using System;[详细]

2023-03-29 09:22 分类：问答
Need to Improve Performance of SQL Query using Aggregate Functions

I have a particular SQL query that seems to suffer from a mysterious performance issue. Here is the query:[详细]

2023-03-28 09:09 分类：问答
How can I compare two fields of a model in a query?

I\'m writing a management command which will filter a product\'s original price with suggested prices.[详细]

2023-03-28 03:48 分类：问答
replace NULL values with latest non-NULL value in resultset series (SQL Server 2008 R2)

for SQL Server 2008 R2 I have a resultset that looks like this (note [price] is numeric, NULL below rep开发者_如何学运维resents a[详细]

2023-03-27 14:54 分类：问答
Intersection of multiple arrays in PostgreSQL

I have a开发者_运维问答 view defined as: CREATE VIEW View1 AS SELECT Field1, Field2, array_agg(Field3) AS AggField[详细]

2023-03-26 23:29 分类：问答
Example of the Scala aggregate function

I have been looking and I cannot find an example or discussion of the aggregate function in Scala that I can understand. It seems pretty powerful.[详细]

2023-03-25 04:35 分类：问答
Counting items or incrementing a number?

From someone with more experience than myself, would it be a better idea to simply count the number of items in a table (such as counting the number of topics in a category) or to keep a variable that[详细]

2023-03-23 23:29 分类：问答
Query question regarding aggregates over a date range

I have a data set where the structure could be like this yes_nodate 01/1/2011 11/1/2011 11/2/2011 01/4/2011[详细]

2023-03-23 19:00 分类：问答