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SQL Queries for Mere Mortals: A Hands-On Guide to Data ... - InformIT

Don't try to fit a "ten-pound sack in a five-pound box." Ensure you aren't trying to store long text in a short character field. SQL Queries for Mere Mortals

Relational databases don't think in rows; they think in . Every query you write is essentially asking the database to find a specific group of data and "set" it aside for you. SQL Queries for Mere Mortals: A Hands-On Guide to Data

Combining two groups together (e.g., a list of all customers and all vendors). SQL Queries for Mere Mortals

Includes all records from one table, even if there is no match in the other (useful for finding "missing" data, like products that haven't sold). 4. Summarizing and Grouping