By Joe Celko

ISBN-10: 1874416508

ISBN-13: 9781874416500

SQL--Structured question Language--is the language all relational databases use to make enquiries. This crucial booklet teaches SQL programming within the shortest attainable time. It covers either the ANSI typical because the minimal requirement, and likewise discusses varied implementations. It additionally serves as a convenient reference.

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The accompanying site, http://groups. google. com/group/sqlfun, includes all of the SQL code and tables from the booklet, together with the complete databases for numerous types of entry and code for construction the corresponding Oracle databases. It additionally offers options to some of the book’s difficulties and an open region for discussions with the writer and different readers.

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We might advise that you do it, but the code will function just fine without it. Definition A = B, means that an expression A is defined in an expanded form as B. Here, expanded doesn't mean there are any more or any less terms, but that the expressions are closer to their terminals or keywords. Example of Syntax Instead of computer syntax we'll use an English language example. It's much easier to relate to, and it functions in the same way in SQL, as SQL has an 'English-like' feel. But beware, we're going to create our own definition of the English language, so we can relate it to computer syntax.

It works in a logical English manner. You specify what it is you want from the database, and from which area, and the query is returned to you in tabular form. Let's have a look at a purely hypothetical case. Here's a jobs database, with a table for each type of job: Railroad Jobs Tax Jobs Job Type Wage Job Type Wage President Manager Driver Guard Train Spotter $1,000 per hour $100 per hour $20 per hour $10 per hour $1 per hour Treasury Secretary Manager Tax Inspector Tax Collector Tax Evader $1,000 per hour $100 per hour $20 per hour $10 per hour $-100 per hour If you wanted to see the details of all the jobs working on the railroads that paid over $5 per hour, you could phrase the SELECT statement needed to get that output in English terminology.

Operations on rows are easy within SQL, but operations on columns are more difficult, as you'll see in later chapters. The cells of a spreadsheet can hold procedures as well as data. You usually only see displayed the results of the procedure. A column in a table can hold only data. 22 Su The SQL Sub-languages We've looked at how SQL handles data and now we'll give you a brief overview of the language itself. SQL can be split into three sub-languages, each with a different function. A database is usually, by its very nature, a shared resource, and the three sub-languages are based on how the work is split among the people who work with shared data.

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Instant SQL by Joe Celko


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