By Clare Churcher
Clare Churcher's Beginning SQL Queries is your consultant to studying the lingua franca of the database undefined: the SQL language. sturdy wisdom of SQL is essential to a person operating with databases, since it is with SQL that you just retrieve facts, control facts, and generate enterprise effects. realizing how you can write stable queries is the basis for all paintings performed in SQL, and it's a starting place that Clare lays good in her e-book.
- Does no longer bore with syntax!
- Helps you research the underlying innovations considering querying a database, and from there the syntax is straightforward
- Provides exceedingly transparent examples and motives
- Is academically sound whereas being sensible and approachable
Read Online or Download Beginning SQL Queries: From Novice to Professional PDF
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Additional resources for Beginning SQL Queries: From Novice to Professional
We saw in Chapter 1 that to keep data accurately in a database, different aspects of our information need to be separated into normalized tables. Most of our queries will require information from two or more tables. You can combine data from two tables in several different ways depending on the nature of the information you are trying to extract. The most often encountered two-table operation is the join. Joins in Relational Algebra The join is one of the relational algebra operations, so we will first look at the definition in terms of the algebra.
Type} We can translate the calculus expression directly into an SQL statement as in Listing 3-8. The extra condition is represented by a WHERE clause. Listing 3-8. Type The SQL statement in Listing 3-8 is based on relational calculus in that it says what the rows to be retrieved are like. We want combinations of rows from Member and Type where the membership types are the same. The statement is equivalent to the statement in Listing 3-4, which uses the INNER JOIN key phrase. Once again, which one you use does not matter—it just depends how you find yourself thinking about the query.
SQL to Retrieve Subset of Information from the View AllTourInfo SELECT LastName, FirstName FROM AllTourInfo WHERE TourType = 'Open' AND Year = 2006 If we didn’t want to have the intermediate step of creating a view, we could combine all the operations into one SQL query as in Listing 3-14 where the name of the view has been replaced with the SQL SELECT statement, Listing 3-11, that we used to define it. Listing 3-14. TourID WHERE TourType = 'Open' AND Year = 2006 Order of Algebra Operations In our relational algebra description, we joined all the tables first and then selected the appropriate rows and columns.
Beginning SQL Queries: From Novice to Professional by Clare Churcher