Beginning SQL Queries: From Novice to Professional by Clare Churcher

By Clare Churcher

Clare Churcher's Beginning SQL Queries is your advisor to studying the lingua franca of the database undefined: the SQL language. reliable wisdom of SQL is important to someone operating with databases, since it is with SQL that you simply retrieve facts, manage information, and generate company effects. realizing the way to write solid queries is the root for all paintings performed in SQL, and it's a beginning that Clare lays good in her booklet.

  • Does no longer bore with syntax!
  • Helps you research the underlying strategies serious about querying a database, and from there the syntax is straightforward
  • Provides exceedingly transparent examples and motives
  • Is academically sound whereas being useful and approachable

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Extra info for Beginning SQL Queries: From Novice to Professional

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Retrieving the Number of Records with a Non-Null Value for Handicap SELECT COUNT(Handicap) FROM Member We can also specify that we want to count the number of unique values for an attribute, that is, how many different handicaps there are. Listing 2-27 shows how to do this. Listing 2-27. Retrieving the Number of Different Values for Handicap SELECT COUNT(DISTINCT Handicap) FROM Member It is worth reiterating that different database software will support different parts of the SQL standard syntax.

I’ll use aliases in all the SQL queries from now on. 23 24 CHAPTER 2 ■ SIMPLE QUERIES ON ONE TABLE Combining Subsets of Rows and Columns In the previous sections, we saw the algebra operations select (a subset of rows) and project (a subset of columns) acting independently. One of the most powerful features of the algebra is that the result of an operation is another table (or, more formally, another set of unique rows). This means we can apply another operation to the result of the first operation and so build up complex queries.

Relational calculus is a way of describing what criteria our required information must satisfy. SQL is a language for specifying queries on a database. There are usually many equivalent ways to specify a query in SQL. Some are like calculus, and some are like algebra. And some are a bit of both. 15 CHAPTER 2 ■■■ Simple Queries on One Table I f a database has been designed correctly, the data will be in several different tables. For example, our golf database is likely to have separate tables for information about members, teams, and tournaments, as well as tables that connect these values, for example, which members play in which teams, enter which tournaments, and so on.

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