2 questions on sql queries constraints and triggers the sections contains different set of questions on sql basics set and null value operations database modifications views and transactions different types of integrity constraints joins nested subqueries and aggregate functions schemas and data types triggers functions and . Performance unlike the locking techniques used in most modern multithreaded applications stm is often very optimistic a thread completes modifications to shared memory without regard for what other threads might be doing recording every read and write that it is performing in a log. This article identifies the 10 most commonly made mistakes when designing a real time data warehouse and gives advice to help you avoid these pitfalls
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