Download Joe Celko's SQL Puzzles and Answers, Second Edition, Second by Joe Celko PDF
By Joe Celko
During this entire revision and enlargement of his first SQL Puzzles e-book, Joe Celko demanding situations you together with his trickiest puzzles-and then is helping clear up them with numerous options and factors. Joe demonstrates the concept techniques which are fascinated with attacking an issue from an SQL standpoint to assist complicated database programmers clear up the puzzles you regularly face. those strategies not just support with the puzzle to hand, yet support increase the approach had to remedy the numerous tricky SQL puzzles you face on a daily basis. after all, a part of the thrill is to determine even if you could write greater ideas than Joe's. * an exceptional number of difficult SQL puzzles with various suggestions and motives. * makes use of the confirmed structure of puzzles and ideas to supply a straightforward, sensible check out SQL programming difficulties - a lot of in an effort to aid clients resolve their very own difficulties. * new version positive factors: - Many new puzzles additional! - Dozens of recent recommendations to puzzles, and utilizing gains in SQL-99 - Code is edited to comply to SQL sort ideas - New bankruptcy on temporal question puzzles - New bankruptcy on universal misconceptions approximately SQL and RDBMS that ends up in difficulties
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Extra info for Joe Celko's SQL Puzzles and Answers, Second Edition, Second Edition
You could drop that PUZZLE 4 SECURITY BADGES 17 CHECK() clause and allow an employee to have no active badge. That, however, would mean that you have to create a way of updating the badge status of the most recently issued badge to “A” for the employees. emp_id)); Again, I must point out that a lot of SQL implementations will also gag on this update because of the correlation names. The rule in SQL-92 is that the scope of the table name in the UPDATE is the whole statement, and the current row is used for the column values referenced.
HINT: For each employee in each year, insert a row even in the years in which the employee did not work. It not only makes the query easier, but you also have a record to update when you get in new information. , month_cnt greater than 0 months) and (2) the month_cnt totaled 60 or more. pen_year - 4) -- why sooner? pen_year); The subquery expression in the SELECT list is a SQL-92 trick, but a number of products already have it. The gimmick is that this will give you all the periods of 60 months or more.
Chain); PUZZLE 7 KEEPING A PORTFOLIO 27 I have to use the SELECT DISTINCT option in case two or more chains were superseded by a single document. You need to be able to reproduce an audit trail for a chain of documents. file_id BY chain, next; You need to keep track of which portfolio superseded this portfolio. file_id = :my_file_id; -- remove for all portfolios You need to be able to reinstate a portfolio, which has the effect of superseding a portfolio or portfolio chain, which results in a circular reference.