SQL for Smarties was hailed as the first book devoted explicitly to the advanced techniques needed to transform an experienced SQL programmer joe celko’s sql for smarties advanced sql programming pdf an expert. In the SQL database community, Joe Celko is a well-known columnist and purveyor of valuable insights. In Joe Celko’s SQL for Smarties: Advanced SQL Programming, he picks up where basic SQL training and experience leaves many database professionals and offers tips, techniques, and explanations that help readers extend their capabilities to top-tier SQL programming. Although Celko denies that the book is about database theory, he nevertheless alludes to theory often to buttress his practical points.
This title is not for novices, as the author points out. Instead, its intended audience is SQL programmers with at least a year’s experience. The book maintains a fine balance between technical discussion and practical explanation–picking hot topics and offering advice on a wide range of issues. The book uses ANSI SQL-89 as its baseline standard, with some mention of SQL-92 features. This insightful text is manna for all the day-to-day SQL coders banging their heads over the language’s subtle challenges. Topics covered: Database design and normalization, SQL data types, querying, grouping, set operations, optimization, data scaling, and encoding.
What month does a week fall in? In or out at a given date and time? Is a given booking period available? What else did buyers of X buy? What exams did a student not register for?
Who makes all the parts for a given assembly? Basic aggregation Aggregates are more popular here than any other topic, by more than 2 to 1 over the next most popular. Basic aggregation is the simplest grouping query pattern: for column foo, display the count, the smallest, the largest, the sum, the average or some other statistic of column bar values. Aggregate across columns You track squash court bookings and fees.
A court booking has one fee, but it has two member references, and those can be the same if one member has brought a guest. For each booking row, the fee is to be split between the two members. What query correctly aggregates fees including cases where the two members of record are the same? Aggregates across multiple joins Given a parent table and two child tables, a query which sums values in both child tables, grouping on a parent table column, returns sums that are exactly twice as large as they should be. Aggregates of specified size Find the values of a table column c1 for which there are a specified number of listed values in another column c2. This is easy to generalise to multiple column expressions, and a HAVING clause specifying any number of items from the IN list.