xquery if statement

Basic JavaScript flow control statement usage, javascript statement Part 3: Process Control statements JavaScript code is the writing position: JavaScript code should be written in . Or as an external reference Use a semicolon to end each JavaScript sentence. Output statement 1. console output: console. log (); It can output some information in the console, and

Eval function Evaluates the value of an expression and returns the result. [result = ]Eval(expression) Parameters Result Options available. is a variable that accepts the returned results. If you do not specify a result, you should consider using the Execute statement instead. Expression Required option. Can be a string that contains any valid VBScript expression. Description In VBScript,x = y can be interpreted in two ways. The first method

MySQL: select statement, mysqlselect statement 1. order by (SORT) A field is usually used as the reference standard for sorting. Syntax: order by [field] asc | desc; (ascending or descending) Tip: Check rules to determine the sorting relationship. Multi-field sorting is allowed (first sort by the first field, and when there is no distinction, sort by the second field, and so on ). [Example] for the followin

In all programming languages, such as C language. JAVA and so on, all have the existence of if statements, of course, also include PHP. The if statement is used to select and execute different code snippets according to the conditions. If statement In all programming languages, such as C language. JAVA and so on, all have the existence of if statements, of course, also include PHP. The if

The difference between a MySQL DELETE statement and a TRUNCATE TABLE statement 2010-10-08 16:05 Anonymous InternetSize:T|TIn the MySQL database, both the DELETE statement and the TRUNCATE TABLE statement can be used to delete data, but there are differences between the two statements, which are described below.AD: Dry

-------Android Training, Java training, look forward to communicating with you! ----------1. Select the structure if statement format and its use　Format of the A:IF statement:if (comparison expression 1) {statement body 1;}else if (comparison expression 2) {Statement body 2;}else if (comparison expression 3) {statement

PL/SQL script language value assignment statement syntax table and record comply with the type usage, select the statement if else usage anonymous block (1), assign value statement syntax PL/SQL values use: = "=" some rules need to be observed in the comparison operator value assignment statement: the character type mu

The cost-based optimizer is very intelligent. In most cases, it selects the correct optimizer, reducing the DBA burden. However, sometimes it is both clever and false. It selects a poor execution plan, making the execution of a statement extremely slow. The cost-based optimizer is very intelligent. In most cases, it selects the correct optimizer, reducing the DBA burden. However, sometimes it is both clever and false. It selects a poor execution plan,

In front of you to explain the PHP loop statement in the while statement loop, in fact, while the statement has another form of expression, which is what we are going to explain to you today, "Do...while" loop statement。 Do...while The concept of cyclic statements Do...while loop Statements And while loop statements a

Outline4.1 Compound statement: Do not focus4.2 Article statementsOverview:Conditional statements can execute different statements based on different conditions. The conditional statement includes the IF statement and the switch multi-branch statement.4.2.1 If condition statementThe IF condition

Executeglobal statement Executes a function multiple statements specified in the script global namespace. ExecuteGlobal statement The statement parameter is a string expression that contains one or more executable statements. You can include more than one statement in the statemen