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Asked by MasonWolf in MySQL Server, MS SQL Server, PostgreSQL Database
I have 3 tables that need to be dealt with in a SQL query. If it comes to it, technically I'm working with a MySQL database, but I'm pretty sure that any of the SQL-utilizing DMBS that I've picked for my categories should be able to work with the same answer.
Anyway, the first table is called "templates" the second is called "tempXcat" and the third is "categories". Their purposes should seem obvious enough. There is a many-to-many relationship between templates and categories, so tempXcat is my crossover table. Now, my question is, how do I construct a statement that identifies all templates NOT represented in the crossover table? I need the same thing for all categories not represented in the crossover table.
I'm fairly certain this is basic SQL stuff, but I'm self-taught, so my instruction has some gaping holes, and I don't know what I'd be looking for if I were to search the manual. Your help will be greatly appreciated. Thanks!
20091111-EE-VQP-89 / EE_QW_EXPERT_20070906