I am writing a simple data warehouse that will allow me to query the table to observe periodic (say weekly) changes in data, as well as changes in the change of the data (e.g. week to week change in t
This has always bothered me - why does the GROUP BY clause in a SQL statement require that I include all non-aggregate columns? These columns should be included by default - a kind of \"GROUP BY *\" -
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Is this valid ANSI SQL?: SELECT 1 AS X ,2 * X AS Y ,3 * Y AS Z Because Teradata (12) can do this, as well as this (yes, crazy isn\'t it):
Can any of these queries be done in SQL? SELECT dates FROM system WHERE dates > \'January 5, 2010\' AND dates < \'January 30, 2010\'
I have two entities A and B that are related in a MxN relation through an intermediary table, thus making a total of three tables. My relation table R h开发者_如何学Cas non-nullable FK constraints on
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I am attempting to make an application capab开发者_如何学Cle of running on both Sql Server and PostgreSQL.
How can I write a query for this? I\'m not an expert to write this much of complex queries in SQL. I for开发者_StackOverflow中文版got to mention bid 3, 4 here. Based on David\'s query, eliminating d
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