Download e-book for kindle: Simply SQL by Rudy Limeback

By Rudy Limeback

ISBN-10: 0980455251

ISBN-13: 9780980455250

Packed with examples, easily SQL is a step by step advent to studying SQL. you will discover how effortless it truly is to exploit SQL to engage with best-practice, powerful databases. instead of bore you with idea, it specializes in the sensible use of SQL with universal databases and makes use of lots of diagrams, easy-to-read textual content, and examples to assist make studying SQL effortless and fun.

  • Step throughout the uncomplicated SQL syntax
  • how to use most sensible practices in database layout
  • grasp complex syntax like internal joins, teams, and subqueries
  • comprehend the SQL datatypes
  • and masses more...

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Extra resources for Simply SQL

Sample text

The special keyword DESC determines that it’s a descending sequence. 6 shows the result set produced by the above query. 6. Results ordered on the created column You may specify multiple columns in the ORDER BY clause, to give multiple levels of sequencing. Another way to describe this is to say that the ORDER BY clause allows any number of major and minor sort keys. 7. 7. Results ordered on multiple columns Wrapping Up: the SELECT Statement To summarize, in this chapter we conducted a quick review of the clauses of the SELECT statement.

Imagine having to read this SQL statement all on one long line: CREATE TABLE teams ( id INTEGER NOT NULL PRIMARY KEY, ➥ name VARCHAR(37), conference VARCHAR(2) NULL ) Neatness helps us to spot parts of the statement we have omitted or mispelled, like the NOT NULL that was accidentally left off the name column in the one line version of the statement above. Did you spot the omission before you read this? , INTEGER, VARCHAR), and is also designated NULL or NOT NULL. Again, please don’t worry if these terms are new to you.

Maintaining a script allows you to start over easily. Improvements in the design—new tables, different columns, and so on—are incorporated into the SQL statements, and when the script is run, these SQL statements create the objects using the new design. Appendix C contains SQL scripts used for the sample applications in this book. com/books/sql1/. Data Manipulation Language In the last section, we covered the three main SQL statements used in Data Definition Language. These were CREATE, ALTER, and DROP, and they are used to manage database objects like tables and columns.

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Simply SQL by Rudy Limeback

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