Lab Sql

I want get the maximum value for this record. Please help me: SELECT rest.field1 FROM masterta… Read more Sql Server : How To Use An Aggregate Function Like Max In A Where Clause

I have a table, let's call it My_Table that has a Created datetime column (in SQL Server) that … Read more Error When Calculating A Running Total (cumulative Over The Previous Periods)

I've inherited the following DB design. Tables are: customers --------- customerid customern… Read more Sql Join, Group By On Three Tables To Get Totals

Lets say I have a few of tables orders = Arel::Table.new :orders stores = Arel::Table.new :stores m… Read more Generating A Subquery With Arel To Get An Average Of Averages

I try to create an aggregate for product (*) in PostgreSQL. The field type of my row is 'double… Read more Product Aggregate In Postgresql

I have the following tables: SELECT * FROM trajectories LIMIT 10; user_id | session_id | … Read more Postgresql: Subgrouping Column Based On Intervals

INFORMIX-SQL 4.10.DC1 (SE Engine), on DOS 6.22, under Microsoft Virtual PC 2007, in Windows 7! EDIT… Read more What's The Fastest Way To Obtain The Maximum Value Of A Column In A Table?

If I have a table with important 2 columns, CREATE TABLE foo (id INT, a INT, b INT, KEY a, KEY b); … Read more How Can You Find The Rows With Equal Columns?