TAILIEUCHUNG - Restricting and Sorting Data

Character strings and date values are enclosed in single quotation marks. Character values are case sensitive, and date values are format sensitive. The default date format is DD-MON-RR. | Restricting and Sorting Data Schedule: Timing Topic 45 minutes Lecture 30 minutes Practice 75 minutes Total Objectives After completing this lesson, you should be able to do the following: Limit the rows retrieved by a query Sort the rows retrieved by a query Lesson Aim While retrieving data from the database, you may need to restrict the rows of data that are displayed or specify the order in which the rows are displayed. This lesson explains the SQL statements that you use to perform these actions. Limiting Rows Using a Selection “retrieve all employees in department 90” EMPLOYEES Limiting Rows Using a Selection In the example on the slide, assume that you want to display all the employees in department 90. The rows with a value of 90 in the DEPARTMENT_ID column are the only ones returned. This method of restriction is the basis of the WHERE clause in SQL. Limiting the Rows Selected Restrict the rows returned by using the WHERE clause. The WHERE clause follows the FROM clause. .

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