Sql Server tutorial - AuthorCode

Using Cross Joins

We can use Cross Join with WHERE clause and Without WHERE clause, When we use the Cross Join without WHERE clause,produces the Cartesian results from the tables. The resultset contains records that are multiplication of record number from both the tables. Continue reading “Using Cross Joins”

System Databases in SQL Server

SQL server installation create some system databases automatically, you can see these database in your SQL server management studio: Continue reading “System Databases in SQL Server”

Using COALESCE in SQL Select Query

COALESCE function returns the first nonnull expression among its arguments. you can use the COALESCE function like as: Continue reading “Using COALESCE in SQL Select Query”

About Sql Server 2005

Microsoft SQL Server is a relational database management system developed by Microsoft. SQL Server 2005 was released in October 2005. It is the successor of the Microsoft SQL Server 2000. Continue reading “About Sql Server 2005”

Using Aliases in SQL Server

You can use some alias for table in the select query for better readability of the query, Aliases of the table are very useful when you are using complex query with multiple lines. Aliases of the tables in the Sql server are also called as a correlation name or range variable. Continue reading “Using Aliases in SQL Server”

Join in SQL Server

Joins are used to extract information from more than one table based on the related column/columns means you can retrieve data from two or more tables based on logical relationships between the tables. Continue reading “Join in SQL Server”

UPDATE Statement in SQL Server

Update statement is different from INSERT and DELETE statements.UPDATE statements is used for updating a single records to multiple records. UPDATE statements use a WHERE clause, same as SELECT statement. Continue reading “UPDATE Statement in SQL Server”

Using IN in SQL Server

IN operator we use when we Determines whether a specified value matches any value in a sub query or a list. The IN operator allows you to specify multiple values in a WHERE clause.it also helps reduce the need to use multiple OR conditions. Continue reading “Using IN in SQL Server”

DATEPART() function in SQL Server

DATEPART() function returns a value equal to the part of a specified date.

Summery

DATEPART(datepart, date)

where date is the valid date or a string in date format
and datepart can be one of the following:

datepart	Abbreviation
year	yy, yyyy
quarter	qq, q
month	mm, m
dayofyear	dy, y
day	dd, d
week	wk, ww
weekday	dw, w
hour	hh
minute	mi, n
second	ss, s
millisecond	ms

Example

Suppose you have a table ‘tbl_employee’
tbl_employee

Employee Id	EmpName	Age	DateOfJoin
1	Ankur	28	11/04/1995
2	David	32	11/04/2002

The following query return the date of joining of the Ankur:

SELECT datepart("year", DateOfJoin)

Output will be:

—————–
1995

Now if you want to current year, you can use the following query:

SELECT DATEPART("Year",GETDATE())

–or—

SELECT DATEPART("yy",GETDATE())

GETDATE() function return the current date.

DATEDIFF() function in SQL Server

DATEDIFF() function is very useful when we are working with date operations. DATEDIFF function return the difference between date items in days, weeks, minutes, years and hours. It can also used with WHERE clause. Continue reading “DATEDIFF() function in SQL Server”