Difference between a Domain,Work group and Home Group?

In a work-group:

@ All computers are peers; no computer has control over another computer.

@ Each computer has a set of user accounts. To log on to any computer in the work group,you must have an account on that computer.

@ There are typically no more than twenty computers.

@ A workgroup is not protected by a password.

 @ All computers must be on the same local network or subnet.

SQL Aliases

SQL aliases are used to give a database table, or a column in a table, a temporary name.

Basically aliases are created to make column names more readable.

SQL Alias Syntax for Columns

SELECT column_name AS alias_name
FROM table_name;

SQL Alias Syntax for Tables

SELECT column_name(s)
FROM table_name AS alias_name;

Source: w3

SQL Wildcard Characters

In SQL, wildcard characters are used with the SQL LIKE operator.

SQL wildcards are used to search for data within a table. 

With SQL, the wildcards are:

Wildcard

%, -->A substitute for zero or more characters

_, --->A substitute for a single character

[charlist], -->Sets and ranges of characters to match

[^charlist] or [!charlist], -->Matches only a character NOT 

specified within the brackets

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