By Clare Churcher
Starting Queries with SQL is a pleasant and simply learn advisor to writing queries with the all-important ― within the database international ― SQL language. a person who does any paintings in any respect with databases must understand anything of SQL, and that's evidenced via the powerful revenues of such books as studying SQL (O'Reilly) and SQL Queries for Mere Mortals (Pearson). starting Queries with SQL is written by means of the writer of starting Database layout, an writer who's garnering nice studies on Amazon as a result of readability and succinctness of her writing
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Extra resources for Beginning SQL Queries
Introducing the Tournament and Entry tables We can use some of the SQL operations we have already seen on the Entry table to answer questions such as which tournaments (just the TourID number) person 258 has entered, who (just the MemberID number) has ever entered tournament 24, or who entered tournament 36 in 2015. Year = 2015 Incorrectly Using a WHERE Clause to Answer Questions with the Word “both” In the previous section we used the logical operator AND to find rows in the Entry table where both TourID = 36 and Year = 2015 were true.
See Appendix 2 for more information. © Clare Churcher 2016 C. 1007/978-1-4842-1955-3_2 15 CHAPTER 2 ■ SIMPLE QUERIES ON ONE TABLE Figure 2-1. Retrieving the subset of rows for Senior members. The SQL for the query to retrieve Senior members is as follows: SELECT * FROM Member WHERE MemberType = 'Senior' This query has three parts, or clauses: The SELECT clause says what columns to retrieve. In this case, * means retrieve all the columns. The FROM clause says which table(s) the query involves, and the WHERE clause describes the condition for deciding whether a particular row should be included in the result.
We’ll see how to deal with questions like this in Chapter 7. Summary In this chapter, we have looked at queries on a single table. Some of the main points covered are: 32 • We can return a subset of rows that satisfy a given condition by using a WHERE clause. The condition is a Boolean expression, which is a statement that is either true or not true. The condition is applied to each row of the table independently. • The SELECT clause allows us to specify a subset of columns. • Because the result of a query is a set of rows, we cannot guarantee the order in which the rows will be returned.
Beginning SQL Queries by Clare Churcher