Question: What is the difference between VRML 1.0 and 2.0? Answer: VRML 1.0 worlds are static environments in which you can move around and click on objects to link to

Question: What is the standard SQL-92 syntax for INSERT INTO? Answer: Be sure to check your product documentation for any variations! This is standard syntax, but not all products will

Question: Please explain Dynamic Worlds. Answer: “The Power of Dynamic Worlds” proposal from the German National Research Center (GMD) is based on an interaction model developed for collaborative distributed virtual

Question: I went to see one of the new VRML 2.0 sites, but only sawblackness. What is going on? Why won’t my VRML browserwork with the new version? Answer: Just

Question: What are the key features of Apple’s Out of this World? Answer: Out of this World from Apple is an extension to VRML based on the 3DMeta File (3DMF)

Question: What are the key features of Active VRML? Answer: Microsoft’s Active VRML, is a proposal built on top Microsoft’s Direct X suite of graphics/multimedia APIs, and also incorporates Microsoft’s

Question: If I make a VRML page, can it be read by any browser? Answer: The original idea behind VRML 1.0 was that any VRML scene should be viewable using

Question: [Joe Celko’s Best Salesmen by Territory Puzzle]Martin Tillinger posted this problem on the MSAccess forum of CompuServe. How do you get the top three salesmen in each territory, given

Question: What can I use to produce VRML, or can I write it like HTML? Answer: It is possible to write VRML as a purely text-based language, using a regular

Question: [Joe Celko’s Sales Gaps Puzzle]Given a table “sales” and a column “saledate” and “customer,” is there a way to get the average number of days between sales dates for

Question: [Joe Celko’s Quantity on Hand Puzzle]You are now the guy in charge of the company inventory. You get requisitions that tell how many widgets people are putting into a

Question: [Joe Celko’s Reservations Puzzle]Since I spend a lot of time this column talking about problems with the order of execution of SQL statements, it is only fair that I

Question: I’ve heard a lot about VRML, but don’t know what it is. Please explain. Answer: VRML (Virtual Reality Markup Language) is a method for sending 3D data across the

Question: [Joe Celko’s Equal Sets Puzzle]Set theory has two symbols for subsets. One is a “horseshoe” on its side, which means that set A is contained within set B and

Question: [Joe Celko’s Dataflow Diagrams Puzzle]Tom Bragg posted a version of this problem on the CASE Forum on CompuServe. You have a table of dataflow diagrams (DFDs), which has the

Question: [Joe Celko’s Milestones Puzzle]This puzzle, in a little different form, came from Brian Young. His system tracks a series of dates (milestones) for each particular type of service (tos)

Question: We are putting together a book with contributions from many Anthologies (identified by their contrnum). We want to find all Anthologies thathave articles in exactly two out of three

Question: How would I change the following statement to yieldonly unique values? select * FROM WEBDBASE where ST = ‘#State#’ AND #SPECIALTY# = ‘x’; Answer: You can’t get unique values

Question: How can I use SQL to specify a query like the example below: select * from mytable where column like ‘a[bc]’This should match both “ab” and “ac” but not

Question: How do I arrange to sort within a GROUP BY clauserather than over the complete result set, e.g. L0 PDV …… L90 PDV …… L180 PDV …… L270 PDV

Question: [Joe Celko’s Employment Agency Puzzle]You are running an employment agency that has requests for jobs and applications from candidates. Both of these forms include a list of the skills

Question: [Joe Celko’s Personnel Problem Puzzle]Daren Race was trying to aggregate the results from an aggregate result set using Gupta’s SQLBase and could not think of any way other than

Question: [Joe Celko’s Consultants Puzzle]Brian K. Buckley posted a version of the following problem on the PowerSoft CompuServe forum in the WATCOM SQL section in 1994 November requesting assistance. He

Question: [Joe Celko’s Budget Versus Actual Puzzle]C. Conrad Cady posted a simple SQL problem on the CompuServe Gupta Forum. He has two tables, Budgeted and Actual, which describe how a

Question: [Joe Celko’s One In Ten Puzzle]Alan Flancman ran into a problem with some legacy system data that had been moved over to a SQL database. The table looked like

Question: Let’s say I have two tables, one with the columns PositionIDand SkillID and one with the columns EmployeeID and SkillID.If I do a SELECT SkillID FROM First_Table WHERE PositionID=7,I

Question: Is there a quick and dirty way to export a delimited datasetvia a simple query? I would like to get something like: value1,value2,value3(The delimeters could be commas, semi-colons, etc.)

Question: The Situation: I need to define some queries to extract data from an existing database (I am using MS Access 2.0). It consists of only two tables, from which

Question: What are the common uses of stored procedures? Answer: Many databases use stored procedures and/or triggers to implementreferential integrity [ensuring that data referenced by another tabledoesn’t get deleted or

Question: I’ve got a “new user” question for you. Some of the tables in our databaseshave several columns containing data that’s not used very often. When I’musing ad-hoc queries, it