So you can generate 10 different versions of the same query, and they can all produce identical results. Each version is just a different execution strategy around the same logical question: “Given ...

The goal of the project is to perform real-world data analysis using SQL queries and gain hands-on experience with database operations. Number of students in each city Average marks by city Number of ...

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(Use IS NULL, not = NULL) → You ran DELETE without a WHERE. Entire table gone. → You wrote a Subquery when a JOIN was much faster. → You forgot a Foreign Key. Now your database has orphan records ...