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CHAPTER 8 Conditions This chapter describes the Decision Making Structure: Decision-making structures require that the programmer specify one or more conditions to be evaluated or tested by the program, along with a statement or statements to be executed if the condition is determined to be true, and optionally, other statements to be executed if the condition is determined to be false. Following is the general from of a typical conditional (i.e., decision making) structure found in most of the programming languages: PL/SQL programming language provides following types of decision-making statements. Click the following links to check their detail. TUTORIALSPOINT Simply Easy Learning Page 35
Statement IF - THEN statement IF-THEN-ELSE statement IF-THEN-ELSIF statement Case statement Searched CASE statement nested IF-THEN-ELSE Description The IF statement associates a condition with a sequence of statements enclosed by the keywords THEN and END IF. If the condition is true, the statements get executed and if the condition is false or NULL then the IF statement does nothing. IF statement adds the keyword ELSE followed by an alternative sequence of statement. If the condition is false or NULL , then only the alternative sequence of statements get executed. It ensures that either of the sequence of statements is executed. It allows you to choose between several alternatives. Like the IF statement, the CASE statement selects one sequence of statements to execute. However, to select the sequence, the CASE statement uses a selector rather than multiple Boolean expressions. A selector is an expression whose value is used to select one of several alternatives. The searched CASE statement has no selector, and it's WHEN clauses contain search conditions that yield Boolean values. You can use one IF-THEN or IF-THEN-ELSIF statement inside another IF-THEN or IF-THEN-ELSIF statement(s). IF - THEN statement It is the simplest form of IF control statement, frequently used in decision making and changing the control flow of the program execution. The IF statement associates a condition with a sequence of statements enclosed by the keywords THEN and END IF. If the condition is TRUE, the statements get executed, and if the condition is FALSE or NULL, then the IF statement does nothing. Syntax: Syntax for IF-THEN statement is: IF condition THEN S; END IF; Where condition is a Boolean or relational condition and S is a simple or compound statement. Example of an IF-THEN statement is: IF (a
Page 1 and 2: PL/SQL Tutorial
Page 3 and 4: C O P Y R I G H T & D I S C L A I M
Page 5 and 6: Table of Contents PL/SQL Overview .
Page 7 and 8: Example: ..........................
Page 9 and 10: Triggering a Trigger ..............
Page 11 and 12: It supports developing web applicat
Page 13 and 14: Step 2 You will have the following
Page 15 and 16: Step 5 Provide a location, where yo
Page 17 and 18: Step 9 Here, Oracle installation wi
Page 19 and 20: Step 11 Once your installation is d
Page 21 and 22: Text Editor Running large programs
Page 23 and 24: END; / The end; line signals the en
Page 25 and 26: Type Type body Each of these units
Page 27 and 28: PL/SQL Numeric Data Types and Subty
Page 29 and 30: Field Name Valid Datetime Values Va
Page 31 and 32: CHAPTER 5 Variables This chapter de
Page 33 and 34: variable is declared and accessible
Page 35 and 36: CHAPTER 6 Constants This chapter sh
Page 37 and 38: CHAPTER 7 Operators This chapter de
Page 39 and 40: END; / IF (a < b) then dbms_output.
Page 41 and 42: ELSE dbms_output.put_line('False');
Page 43: For example x = 7 + 3 * 2; here, x
Page 47 and 48: SELECT salary INTO c_sal FROM custo
Page 49 and 50: An IF-THEN statement can have zero
Page 51 and 52: Excellent PL/SQL procedure successf
Page 53 and 54: CHAPTER 9 Loops This chapter descri
Page 55 and 56: PL/SQL procedure successfully compl
Page 57 and 58: FOR a in 10 .. 20 LOOP dbms_output.
Page 59 and 60: 2 is prime 3 is prime 5 is prime 7
Page 61 and 62: Example: DECLARE a number(2) := 10;
Page 63 and 64: Example: DECLARE a number(2) := 10;
Page 65 and 66: Restrictions with GOTO Statement GO
Page 67 and 68: introduction clob; choice char(1);
Page 69 and 70: The following examples illustrate s
Page 71 and 72: CHAPTER 11 Arrays This chapter desc
Page 73 and 74: You can initialize the varray eleme
Page 75 and 76: S.N. Parts & Description 1 2 3 Decl
Page 77 and 78: initialize it to a default value; h
Page 79 and 80: CHAPTER 13 Functions This chapter d
Page 81 and 82: Total no. of Customers: 6 PL/SQL pr
Page 83 and 84: CHAPTER 14 Cursors This chapter exp
Page 85 and 86: Select * from customers; +----+----
Page 87 and 88: CHAPTER 15 Records This chapter des
Page 89 and 90: Book ID Defining a Record The recor
Page 91 and 92: printbook(book2); END; / When the a
Page 93 and 94: DECLARE c_id customers.id%type := 8
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ACCESS_INTO_NULL 06530 -6530 CASE_N
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CHAPTER 17 Triggers This chapter de
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CHAPTER 18 Packages This chapter de
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The following program provides a mo
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CHAPTER 19 Collections This chapter
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Example: Elements of an index-by ta
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| ID | NAME | AGE | ADDRESS | SALAR
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VALUE_ERROR A subscript is null or
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SQL*Plus terminates abnormally, a R
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CHAPTER 21 Date & Time This chapter
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TIMESTAMP WITH LOCAL TIME ZONE - it
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8/31/2012 5:26:55.347000 PM The Int
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4 5 6 7 DBMS_OUTPUT.GET_LINES (line
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When the above code is executed at
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IF (r1 > r2) THEN -- calling measur
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CREATE OR REPLACE TYPE BODY rectang
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