javascript barcode scanner mobile 9: Retrieving, Restricting, and Sorting Data Using SQL in Software

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9: Retrieving, Restricting, and Sorting Data Using SQL
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Product Description 11G SQL Exam Guide 11G All-in-One Guide
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Table:
Product Status ACTIVE ACTIVE
Orders
Stock Count 20 40
Order Status COMPLETE PENDING
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Order Amount 680 400
Order Items
Order Item Id 1 2 1
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Table 9-2 Sample Data for the WEBSTORE Schema
Execute a Basic SELECT Statement
The practical capabilities of the SELECT statement are realized in its execution The key to executing any query language statement is a thorough understanding of its syntax and the rules governing its usage You will learn more about this topic first, then about the execution of a basic query, and finally about expressions and operators, which exponentially increase the utility of data stored in relational tables Next, the concept of a null value is demystified, as its pitfalls are exposed These topics are covered in the following four sections: Syntax of the primitive SELECT statement Rules are meant to be followed SQL expressions and operators NULL is nothing
OCA/OCP Oracle Database 11g All-in-One Exam Guide
Syntax of the Primitive SELECT Statement
In its most primitive form, the SELECT statement supports the projection of columns and the creation of arithmetic, character, and date expressions It also facilitates the elimination of duplicate values from the results set The basic SELECT statement syntax is as follows:
SELECT *|{[DISTINCT] column|expression [alias],} FROM table;
The special keywords or reserved words of the SELECT statement syntax appear in uppercase When using the commands, however, the case of the reserved words in your query statement does not matter Reserved words cannot be used as column names or other database object names SELECT, DISTINCT, and FROM are three keywords A SELECT statement always contains two or more clauses The two mandatory clauses are the SELECT clause and the FROM clause The pipe symbol (|) is used to denote OR So you can read the first form of the preceding SELECT statement as
SELECT * FROM table;
In this format, the asterisk symbol (*) is used to denote all columns SELECT * is a succinct way of asking Oracle to return all possible columns It is used as a shorthand, time-saving symbol instead of typing in SELECT column1, column2, column3, column4, ,columnX, to select all the columns The FROM clause specifies which table to query to fetch the columns requested in the SELECT clause You can issue the following SQL command to retrieve all the columns and all the rows from the REGIONS table in the HR schema:
select * from regions;
When this command is executed, it returns all the rows of data and all the columns belonging to this table Use of the asterisk in a SELECT statement is sometimes referred to as a blind query because the exact columns to be fetched are not specified The second form of the basic SELECT statement has the same FROM clause as the first form, but the SELECT clause is different:
SELECT {[DISTINCT] column|expression [alias], }FROM table;
This SELECT clause can be simplified into two formats:
SELECT column1 (possibly other columns or expressions) [alias optional] OR SELECT DISTINCT column1 (possibly other columns or expressions) [alias optional]
An alias is an alternative name for referencing a column or expression Aliases are typically used for displaying output in a user-friendly manner They also serve as shorthand when referring to columns or expressions to reduce typing Aliases will be discussed in detail later in this chapter By explicitly listing only the relevant columns in the SELECT clause you, in effect, project the exact subset of the results you wish to retrieve The following statement will return just the REGION_NAME column of the REGIONS table:
select region_name from regions;
9: Retrieving, Restricting, and Sorting Data Using SQL
You may be asked to obtain all the job roles in the organization that employees have historically fulfilled For this you can issue the command: SELECT * FROM JOB_ HISTORY However, in addition, the SELECT * construct returns the EMPLOYEE_ID, START_DATE, and END_DATE columns The uncluttered results set containing only the JOB_ID and DEPARTMENT_ID columns can be obtained with the following statement:
select job_id,department_id from job_history;
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