By Sudan M.
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Here is our first opportunity to see rows in action. Here is how to insert a row of data into the teams table: INSERT INTO teams ( id , name , conference ) VALUES ( 9 , 'Riff Raff' , 'F' ) The important part to remember, with our tabular structure in mind, is that the INSERT statement inserts entire rows. An INSERT statement should contain two commaseparated lists surrounded by parentheses. The first list identifies the columns in the new row into which the constants in the second list will be inserted.
The difficulty with this concept is understanding that, after the grouping operation has completed, the original rows are no longer available. Instead, group rows are produced. A group row is a new row created to represent each group of rows found during the aggregation process. sql (excerpt) SELECT category, COUNT(*) AS articles FROM entries GROUP BY category The grouping column in this example is category, as specified by the GROUP BY clause. Each row in the entries table is assigned to a specific group based on the value of its category column.
To illustrate our SELECT statements, we’ll use another sample application. In Chapter 1, the application was Teams and Games (although we used only the teams table). In this chapter, the application is a content management system, or CMS for short. Remember, the sample applications are described in Appendix B. Content management system is a generic term that simply means a system to store, manage, and retrieve content. In most cases this means the content of a web site. ) So before we can examine and discuss our sample SELECT statements, we need to have some sample tables to select from.
Algorithmic Introduction to Coding Theory by Sudan M.