SUM (user_object_reserved_page_count)*8 as user_obj_kb, SUM (internal_object_reserved_page_count)*8 as internal_obj_kb, SUM (version_store_reserved_page_count)*8 as ...

I fell in love with SQL the day I realised the database is actually a massive, high-performance calculator. 1/ Its foundation in relational algebra makes perfect mathematical sense. 2/ Declarative ...

Here are some practical SQL tips that can dramatically improve database performance: Avoid using SELECT * Only retrieve the columns you actually need. Use proper indexes Indexes can reduce query ...

SET rating = (SELECT AVG (rating) FROM (SELECT rating FROM restaurants) AS temp) WHERE rating IS NULL; -- ratings table UPDATE ratings SET feedback = 'No text feedback provided' WHERE feedback IS NULL ...