Q201. What is the difference between <link> tag and <a> tag?
The anchor tag `` is used to create a hyperlink to another web page or to a certain part of a web page and these links are clickable, whereas, link tag `` defines a link ...
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Q202. What is the "any" type in TypeScript, and when should it be used?
The "any" type in TypeScript is a type that represents a value of any type. It essentially disables type checking for that particular value, allowing it to be assigned or...
Q203. What is the difference between let and var?
You can list out the differences in a tabular format | var | let | | -------------------------------------------------------------- | ------------------------------------...
Q204. Which comparison operators exist?
Relational SQL engines provide a rich set of comparison operators evaluated in `WHERE` and `HAVING` clauses: | Operator | Meaning | Example | | :--- | :--- | :--- | | `=`...
Q205. What is the reason to choose the name let as a keyword?
The keyword `let` was chosen because it originates from mathematical notation, where "let" is used to introduce new variables (for example, "let x = 5"). This term was ad...
Q206. Select records where FirstName="John" AND LastName="Jackson"?
To retrieve records that satisfy multiple simultaneous criteria, use the **`AND`** logical conjunction operator: ```sql SELECT * FROM Customers WHERE FirstName = 'John' A...
Q207. What is the canvas element in HTML5?
The **``** element provides a scriptable bitmap drawing surface in HTML. It acts as an empty resolution-dependent drawing container that JavaScript manipulates via proced...
Q208. What is the "readonly" modifier in TypeScript, and how does it affect properties and arrays?
The "readonly" modifier in TypeScript is used to make properties or array elements read-only, meaning they cannot be modified once initialized. It provides a way to enfor...
Q209. How do you redeclare variables in a switch block without an error?
When you try to redeclare variables using `let` or `const` in multiple `case` clauses of a `switch` statement, you will get a SyntaxError. This happens because, in JavaSc...
Q210. How to select 10 random rows?
```sql -- MySQL SELECT * FROM tbl ORDER BY RAND() LIMIT 10; -- PostgreSQL SELECT * FROM tbl ORDER BY RANDOM() LIMIT 10; -- SQL Server SELECT TOP 10 * FROM tbl ORDER BY NE...