control statements

first, sequential statementsStatement: A semicolon-delimited code is called as a statementNote: No code is written just a semicolon, but also a statement, called an empty statementSecond, Judgment (If...else)Note: If there is only one statement in

Equivalent to the IF Else statement in JavaIF Boolean expression then PL/SQL and SQL statements ;END IF;IF Boolean expression   then pl/sql and sql statement ; else other statements ; end IF;

PL OUTPUT StatementSet serverout on; --turn on the output statement function of PLDeclaren Number:=1; --Declares a variable n of type number and assigns a value of 1V varchar2: = ' world '; --Declare a variable V of type VARCHAR2 "World"Begin--The

If-else keywordsIF (condition)Statement or statement blockELSEStatement or statement blockStatement or statement block with begin ... End indicatesIF (condition)BEGINStatement 1Statement 2ENDFor example:DECLARE @test INTSET @test =1SELECT @test =avg

--if ElseIf 1>0print ' big '--begin End StructureBegin end use to set a block for batch processingIf 1>0Beginprint ' big 'EndThe--case statement has a return valuedeclare @a int, @b char (10)Set @a=1Set @b=caseWhen @a>0Then ' greater than 0 'When

The statements in T-SQL that are used to write process Control modules are: BEGIN ... and statement, IF ... Else statements, case statements, while statements, goto statements, break statements, WAITFOR statements, and return statements.1. BEGIN ...

A transaction is a logical unit of database operations that can contain one or more DML (data manipulation languages), DDL (data definition Language), and DCL (Data Control language) statements that form a logical whole.The execution of a

Process Control Statements refers to the control of the logical Calculation section, which is used for program execution and process Fits. 1.Begin End StatementEncapsulates multiple T-SQL statement combinations, which are composed of a unit to

I. The existence and judgment of documents-D to determine if the file exists and whether it is a directory file (the directory is true)-E to determine if the file exists (exists as true)-F to determine if the file exists and is a normal file (the

Overview ...1.Case Syntax2.If Syntax3.Iterate Syntax4.Leave Syntax5.Loop Syntax6.Repeat Syntax7.Return Syntax8.While SyntaxMySQL supports the,,,, IF CASE ITERATE LEAVE LOOP WHILE , and REPEAT constructs for flow control within stored programs. It

An environment variable 1 overviewThe bash shell uses a feature called environment variables to store information about the shell session and the work environment, which also allows false data to be stored in memory so that the shell can run

Statements are always executed sequentially: The first statement is finished, followed by the second, third, and so on. This is the simplest case, in order to better control the operation of the statement, the programming language provides a variety

Flow Control statements in PL/SQL and temporary Oracle tables [SQL] create global temporary table temp_dept (dno number, dname varchar2 (10) on commit delete rows; insert into temp_dept values (10, 'abc'); drop table temp_dept -- the temporary table

main.swift//Control Statement -03//import foundationprintln ("Hello, world!") Define a fraction var score = 80;/*** Define an array */var Scorearr = [90,99,45,89,67,54];var minscore = 0;var Maxscore = 0;var Avgscore = 0 .0;var Sumscore = 0.0;var

C # programs execute on a line-by-line, top-down, with no missing code. In order for the program to execute according to the process designed by the developer, it is necessary to make the process of condition judgment, loop and jump, which need to

First, the loop control statementThe loop statement mainly consists of executing an operation repeatedly while satisfying the condition, and the loop control statement mainly includes the while statement , thedo...while statement and the FOR

"IF ... Then ... StatementIf condition Then[Statements1]Else[Statements2]End IfCondition is a logical expression that indicates the condition to be judged when making a selection, the result of which is a Boolean type, and when its value is true,

Control Statement 1.1 sequential structure (most common)Features: code executes from top to bottom1.2 Selection structure:If Judgment statement:Switch Judgment statement:Considerations for using the switch statement:1. A break is required at the end

Sequential process You have a cup of water, which is generally like this:1. fill the cup with boiling water;2. Wait for boiling water to cool down;3. Pour it in your mouth.In this example, you can think of how to accomplish things,There must always

C # process control statements mainly include the following: If select: If SELECT statement has three types: in fact, this is similar to the IF Statement of VB. Type 1: What to do if something happens: if(expression) { statement }Type 2: