Category SQL

Delete duplicate records from Table using SQLRead More

Today i'll explain how to generate random password in SQL by using a template. Template work as like as format that every new password will generate as same format. Read More

Convert Rows to Columns in SQL Server Without Using Pivot

DECLARE @UserData TABLE (UserName VARCHAR(50),Mobile VARCHAR(50))

https://plus.google.com/103205117009535639356Read More

Get List of Stored procedure,Tables,Triggers names in database To get list of procedures in SQL Server we need to write the query like as shown below USE TempDB SELECT * FROM SYS.PROCEDURES Get List of table names in databaseRead More

I will explain to change identity column seed value in SQL server or reseed identity column seed value of table in SQL server or how to change identity column value in SQL server. DBCC CHECKIDENT (Table_Name, RESEED, New_Reseed_Value) Table_Name is name of your identity column tableRead More

To remove index from table we use drop index statement in sql server. To create index on column in sql server that syntax will be like as shown below Syntax to Create Index CREATE INDEX indexname ON Tablename(columnname)Read More

Here I will explain difference between cursor and while loop in sql server with example or explain cursor vs while loop with example in sql server. Cursors in sql server allow you to fetch a set of data, loop through each record, and modify the values as necessary; then, you can easily assign these values to variables and perform processing on these values. While loop also same as cursor to fetch set of data and process each row in sql server.Read More

Normalization is the process of efficiently organizing data in a database. There are two goals of the normalization process: eliminating redundant data (for example, storing the same data in more than one table) and ensuring data dependencies make sense (only storing related data in a table). Both of these are worthy goals as they reduce the amount of space a database consumes and ensure that data is logically stored. Database normalization is the process of organizing the fields and tables of a relational database to minimize redudancy and dependency. Normalization usually involves dividing large tables into smaller (and less redundant) tables and defining relationships between them. The objective is to isolate data so that additions, deletions, and modifications of a field can be made in just one table and then propagated through the rest of the database using the defined relationships. Normalization is a process of simplifying the relationship between the data in a record it is carried out for the following reasons. To simplifying the maintenance of data through updates, insertion and deletions To allow simple retrieval of data in response to query and requests To avoid restructuring of data when new application requirements arises. To structure the data so that any relationship can be easily representedRead More

CHAR is a Fixed Length Data Type. For example if you declare a variable/column of CHAR (10) data type, then it will always take 10 bytes irrespective of whether you are storing 1 character or 10 character in this variable or column. And in this example as we have declared this variable/column as CHAR(10), so we can store max 10 characters in this column. OR It stores fixed length of character. if you declare char(50) then it allocates memory for 50 characters. if you store 10 character word then it store it in 10 characters memory location and other 40 character's memory location will be wasted. Char datatype can store upto 8000 bytes of fixed-length character. VARCHAR is a variable length Data Type. For example if you declare a variable/column of VARCHAR (10) data type, it will take the no. of bytes equal to the number of characters stored in this column. So, in this variable/column if you are storing only one character then it will take only one byte and if we are storing 10 characters then it will take 10 bytes. And in this example as we have declared this variable/column as VARCHAR (10), so we can store max 10 characters in this column.Read More

GETDATE() Gives current date time (server’s time zone) E.g. SELECT GETDATE()return 2011-08-25 09:54:39.963 GETUTCDATE() Gives current date time (GMT + 0 Time zone) E.g. SELECT GETUTCDATE() return 2011-08-25 04:27:30.163 ISDATE('Value') Returns bool value whether given value is proper date or not E.g. SELECT ISDATE('2011-08-25') return 1 SELECT ISDATE('2011-13-25') return 0 LTRIM('Value') Trims from left E.g. SELECT LTRIM(' SQL SERVER ') return ‘SQL SERVER ‘ RTRIM('Value') Trims from right E.g. SELECT LTRIM(' SQL SERVER ') return ‘ SQL SERVER‘ REPLACE() replace all occurrence of string with other string E.g. SELECT REPLACE('SQL SERVER ','S','A') return ‘AQL AERVER’Read More