Boolean Values. Very often, in programming, you will need a data type that can only have one of two values, like. YES / NO. ON / OFF. TRUE / FALSE. For this, JavaScript has a Boolean data type. It can
For this, Java has a boolean data type, which can only take the values true or false: Example boolean isJavaFun = true; boolean isFishTasty = false; System.out.println(isJavaFun); // Outputs true Syst
Booleans are the basis for all Java comparisons and conditions. You will learn more about conditions ( if...else) in the next chapter. Test Yourself With Exercises Exercise: Fill in the missing parts
To create a UNIQUE constraint on the "ID" column when the table is already created, use the following SQL: MySQL / SQL Server / Oracle / MS Access: ALTER TABLE Persons ADD UNIQUE (ID); To name a UNIQU
The element is most often displayed as a horizontal rule that is used to separate content (or define a change) in an HTML page. Browser Support Global Attributes The tag also supports the Gl
The equalsIgnoreCase () method compares two strings, ignoring lower case and upper case differences. This method returns true if the strings are equal, and false if not. Tip: Use the compareToIgnoreCa
The tag specifies bold text without any extra importance. Tips and Notes. Note: According to the HTML5 specification, the tag should be used as a LAST resort when no other tag is more appropri
The SQL SELECT INTO Statement The SELECT INTO statement copies data from one table into a new table. SELECT INTO Syntax Copy all columns into a new table: SELECT * INTO newtable [IN externaldb] FROM o
SELECT Employees.LastName, COUNT(Orders.OrderID) AS NumberOfOrders. FROM (Orders. INNER JOIN Employees ON Orders.EmployeeID = Employees.EmployeeID) GROUP BY LastName. HAVING COUNT(Orders.OrderID) > 10
Definition and Usage The find () method finds the first occurrence of the specified value. The find () method returns -1 if the value is not found. The find () method is almost the same as the index (
Media features provide more specific details to media queries, by allowing to test for a specific feature of the user agent or display device. For example, you can apply styles to only those screens t
The element is used to create a drop-down list. The element is most often used in a form, to collect user input. The name attribute is needed to reference the form data after the for
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The CONVERT () function converts a value (of any type) into a specified datatype. Tip: Also look at the CAST () function. Syntax CONVERT ( data_type (length), expression, style) Parameter Values Techn
Google Fonts are free to use, and have more than 1000 fonts to choose from. How To Use Google Fonts Just add a special style sheet link in the section and then refer to the font in the CSS. Exa
All of Google fonts are free and easy to use. Try it Yourself » 810 Google Fonts Currently there are 810 fonts available at Google: Previous Next course today! w 3 s c h o o l s C E R T I F I E D . 2
The overflow property specifies what should happen if content overflows an element's box. This property specifies whether to clip content or to add scrollbars when an element's content is too big to f
Definition and Usage The tag is an inline container used to mark up a part of a text, or a part of a document. The tag is easily styled by CSS or manipulated with JavaScript using the cl
Set different length values, using px (pixels): h1 { font-size: 60px; } p { font-size: 25px; line-height: 50px; } Try it Yourself » Note: A whitespace cannot appear between the number and the unit. Ho
C# Conditions and If Statements. C# supports the usual logical conditions from mathematics: Less than: a < b Less than or equal to: a b Greater than or equal to: a >= b Equal to
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Java Conditions and If Statements. You already know that Java supports the usual logical conditions from mathematics: Less than: a < b Less than or equal to: a b Greater than or
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OOP stands for Object-Oriented Programming. Procedural programming is about writing procedures or functions that perform operations on the data, while object-oriented programming is about creating obj
The abstract keyword is a non-access modifier, used for classes and methods: Abstract class: is a restricted class that cannot be used to create objects (to access it, it must be inherited from anothe
CSS Overflow visible - Default. The overflow is not clipped. The content renders outside the element's box hidden - The overflow is clipped, and the rest of the content will be invisible scroll - The
In CSS there are five generic font families: Serif fonts have a small stroke at the edges of each letter. They create a sense of formality and elegance. Sans-serif fonts have clean lines (no small str
The font-family property specifies the font for an element. The font-family property can hold several font names as a "fallback" system. If the browser does not support the first font, it tries the ne