if and only if statements examples

Conditional control StatementsIf statementSimple if judgment statement, when the condition after the if is true, execute print (' yes '), otherwise execute the statement inside the Else, print (' No ')if True: print ('yes')else: print ('

In PHP, conditional statements mainly use statements such as if else and if ElseIf and Swicth case, which are used to the most. One, if...else statements If...else statements Executes a piece of code when the condition is established, and executes

Find slow SQL statements in MySQL and mysqlsql statements How can I find slow SQL statements in mysql? This may be a problem for many people. MySQL uses slow query logs to locate SQL statements with low execution efficiency. When the --

　　　In our previous section, we found that when we use string to do some function processing, we all write down the whole string, such as "Jasonhy". Startwith ("J"), If we use "Jasonhy" in many places in the program, each of them is written like this,

The purpose of this paper is to review 3 kinds of IF statements and case multi-branch structure statements that the shell implements for branching, and to supplement the execution efficiency of if and case.Knowledge Reserve The

This article mainly describes the example of using if in MySQL statements and the specific operation steps, this document demonstrates how to use the if statement in MySQL. The following describes the specific solution. I hope it will be helpful in

The principle is to use set variables.and is superimposed with a variable, or is toggled with 0 or 1.The logical and/or logical OR operation of the IF condition is not supported in Nginx configuration, and the nested syntax of if is not supported,

if (condition) StatementThe condition in the condition statement at this point is that it needs to be enclosed in parentheses.  In fact, the conditional statements in Java are the same as in C + +. Java often wants to execute multiple statements

Variable:Define variable: DECLARE @ variable name data typeVariable assignment: SET @ variable name = valueOutput: Print variable or stringThe SQL language, like other programming languages, has control statements such as variables, branches, loops,

First, use the common ternary operator if (foo) bar (); else Baz (); ==> Foo?bar (): Baz (); if (!foo) bar (); else Baz (); ==> Foo?baz (): Bar (); if (foo) return bar (); else return Baz (); ==> return Foo?bar (): Baz (); For the above use