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SQL SELECT Statement
1.
Copyright © 2013,
Oracle and/or its affiliates. All rights reserved. Retrieving Data Using the SQL SELECT Statement
2.
Copyright © 2013,
Oracle and/or its affiliates. All rights reserved.2 - 2 Objectives After completing this lesson, you should be able to do the following: • List the capabilities of SQL SELECT statements • Execute a basic SELECT statement
3.
Copyright © 2013,
Oracle and/or its affiliates. All rights reserved.2 - 3 Lesson Agenda • Capabilities of SQL SELECT Statements • Arithmetic expressions and NULL values in the SELECT statement • Column aliases • Use of concatenation operator, literal character strings, alternative quote operator, and the DISTINCT keyword • DESCRIBE command
4.
Copyright © 2013,
Oracle and/or its affiliates. All rights reserved.2 - 4 Capabilities of SQL SELECT Statements SelectionProjection Table 1 Table 2 Table 1Table 1 Join
5.
Copyright © 2013,
Oracle and/or its affiliates. All rights reserved.2 - 5 Basic SELECT Statement • SELECT identifies the columns to be displayed. • FROM identifies the table containing those columns. SELECT {*|[DISTINCT] column|expression [alias],...} FROM table;
6.
Copyright © 2013,
Oracle and/or its affiliates. All rights reserved.2 - 6 Selecting All Columns SELECT * FROM departments;
7.
Copyright © 2013,
Oracle and/or its affiliates. All rights reserved.2 - 7 Selecting Specific Columns SELECT department_id, location_id FROM departments;
8.
Copyright © 2013,
Oracle and/or its affiliates. All rights reserved.2 - 8 Writing SQL Statements • SQL statements are not case sensitive. • SQL statements can be entered on one or more lines. • Keywords cannot be abbreviated or split across lines. • Clauses are usually placed on separate lines. • Indents are used to enhance readability. • In SQL Developer, SQL statements can be optionally terminated by a semicolon (;). Semicolons are required when you execute multiple SQL statements. • In SQL*Plus, you are required to end each SQL statement with a semicolon (;).
9.
Copyright © 2013,
Oracle and/or its affiliates. All rights reserved.2 - 9 Column Heading Defaults • SQL Developer: – Default heading alignment: Left-aligned – Default heading display: Uppercase • SQL*Plus: – Character and Date column headings are left-aligned. – Number column headings are right-aligned. – Default heading display: Uppercase
10.
Copyright © 2013,
Oracle and/or its affiliates. All rights reserved.2 - 10 Lesson Agenda • Capabilities of SQL SELECT Statements • Arithmetic expressions and NULL values in the SELECT statement • Column Aliases • Use of concatenation operator, literal character strings, alternative quote operator, and the DISTINCT keyword • DESCRIBE command
11.
Copyright © 2013,
Oracle and/or its affiliates. All rights reserved.2 - 11 Arithmetic Expressions Create expressions with number and date data by using arithmetic operators. Multiply* Divide/ Subtract- Add+ DescriptionOperator
12.
Copyright © 2013,
Oracle and/or its affiliates. All rights reserved.2 - 12 SELECT last_name, salary, salary + 300 FROM employees; Using Arithmetic Operators …
13.
Copyright © 2013,
Oracle and/or its affiliates. All rights reserved.2 - 13 SELECT last_name, salary, 12*salary+100 FROM employees; Operator Precedence SELECT last_name, salary, 12*(salary+100) FROM employees; 1 2 … …
14.
Copyright © 2013,
Oracle and/or its affiliates. All rights reserved.2 - 14 Defining a Null Value • Null is a value that is unavailable, unassigned, unknown, or inapplicable. • Null is not the same as zero or a blank space. SELECT last_name, job_id, salary, commission_pct FROM employees; … …
15.
Copyright © 2013,
Oracle and/or its affiliates. All rights reserved.2 - 15 SELECT last_name, 12*salary*commission_pct FROM employees; Null Values in Arithmetic Expressions Arithmetic expressions containing a null value evaluate to null. … …
16.
Copyright © 2013,
Oracle and/or its affiliates. All rights reserved.2 - 16 Lesson Agenda • Capabilities of SQL SELECT Statements • Arithmetic expressions and NULL values in the SELECT statement • Column aliases • Use of concatenation operator, literal character strings, alternative quote operator, and the DISTINCT keyword • DESCRIBE command
17.
Copyright © 2013,
Oracle and/or its affiliates. All rights reserved.2 - 17 Defining a Column Alias A column alias: • Renames a column heading • Is useful with calculations • Immediately follows the column name (There can also be the optional AS keyword between the column name and the alias.) • Requires double quotation marks if it contains spaces or special characters, or if it is case-sensitive
18.
Copyright © 2013,
Oracle and/or its affiliates. All rights reserved.2 - 18 Using Column Aliases SELECT last_name "Name" , salary*12 "Annual Salary" FROM employees; SELECT last_name AS name, commission_pct comm FROM employees; … …
19.
Copyright © 2013,
Oracle and/or its affiliates. All rights reserved.2 - 19 Lesson Agenda • Capabilities of SQL SELECT Statements • Arithmetic Expressions and NULL values in SELECT statement • Column Aliases • Use of concatenation operator, literal character strings, alternative quote operator, and the DISTINCT keyword • DESCRIBE command
20.
Copyright © 2013,
Oracle and/or its affiliates. All rights reserved.2 - 20 Concatenation Operator A concatenation operator: • Links columns or character strings to other columns • Is represented by two vertical bars (||) • Creates a resultant column that is a character expression SELECT last_name||job_id AS "Employees" FROM employees; …
21.
Copyright © 2013,
Oracle and/or its affiliates. All rights reserved.2 - 21 Literal Character Strings • A literal is a character, a number, or a date that is included in the SELECT statement. • Date and character literal values must be enclosed within single quotation marks. • Each character string is output once for each row returned.
22.
Copyright © 2013,
Oracle and/or its affiliates. All rights reserved.2 - 22 Using Literal Character Strings SELECT last_name ||' is a '||job_id AS "Employee Details" FROM employees; …
23.
Copyright © 2013,
Oracle and/or its affiliates. All rights reserved.2 - 23 Alternative Quote (q) Operator • Specify your own quotation mark delimiter. • Select any delimiter. • Increase readability and usability. SELECT department_name || q'[ Department's Manager Id: ]' || manager_id AS "Department and Manager" FROM departments;
24.
Copyright © 2013,
Oracle and/or its affiliates. All rights reserved.2 - 24 Duplicate Rows The default display of queries is all rows, including duplicate rows. SELECT department_id FROM employees; SELECT DISTINCT department_id FROM employees; … 1 2
25.
Copyright © 2013,
Oracle and/or its affiliates. All rights reserved.2 - 25 Lesson Agenda • Capabilities of SQL SELECT Statements • Arithmetic expressions and NULL values in the SELECT statement • Column aliases • Use of concatenation operator, literal character strings, alternative quote operator, and the DISTINCT keyword • DESCRIBE command
26.
Copyright © 2013,
Oracle and/or its affiliates. All rights reserved.2 - 26 Displaying the Table Structure • Use the DESCRIBE command to display the structure of a table. • Or, select the table in the Connections tree and use the Columns tab to view the table structure. DESC[RIBE] tablename
27.
Copyright © 2013,
Oracle and/or its affiliates. All rights reserved.2 - 27 Using the DESCRIBE Command DESCRIBE employees
28.
Copyright © 2013,
Oracle and/or its affiliates. All rights reserved.2 - 28 Quiz Identify the two SELECT statements that execute successfully. a. SELECT first_name, last_name, job_id, salary*12 AS Yearly Sal FROM employees; b. SELECT first_name, last_name, job_id, salary*12 "yearly sal" FROM employees; c. SELECT first_name, last_name, job_id, salary AS "yearly sal" FROM employees; d. SELECT first_name+last_name AS name, job_Id, salary*12 yearly sal FROM employees;
29.
Copyright © 2013,
Oracle and/or its affiliates. All rights reserved.2 - 29 Summary In this lesson, you should have learned how to: • Write a SELECT statement that: – Returns all rows and columns from a table – Returns specified columns from a table – Uses column aliases to display more descriptive column headings SELECT *|{[DISTINCT] column|expression [alias],...} FROM table;
30.
Copyright © 2013,
Oracle and/or its affiliates. All rights reserved.2 - 30 Practice 2: Overview This practice covers the following topics: • Selecting all data from different tables • Describing the structure of tables • Performing arithmetic calculations and specifying column names
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