SQL Questions for Interview

Top SQL Expert Reveals BEST Query Techniques

SQL SELECT optimization that saves 40,000X resources 🚀 Stop using SELECT * in your queries. Here's why: I ran an EXPLAIN PLAN on a SELECT * query pulling 1M rows. Result? 60 MILLION bytes transferred. Then I optimized it: Replaced * with specific columns Added WHERE clause filtering Result: 1,512 bytes That's a 99.99% reduction in query ...

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How to find the missing records from the table using Except operator and sub query ? #coding #sql

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