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Vivek's SQL Notes

Vivek johari is currently a Analyst and have more that 5.5 yeras of experience in database. He has Master degree in Computer and also he is Microsoft certified Sql DBA (MCTS)& Microsoft certified SQl BI professional(MCTS). He is also Oracle certified profession(OCP)DBA in ORACLE 10g and ORACLE 9i.He has the experience of working in PL/SQL, T-SQL and SSIS/SSRS. His work basically involved designing and optimization of the Database.He has also published many database articles on his blog Technologies with Vivek Johari.

Archives: November 2009

Sql Server - Union and Union All

Union and Union All, both are used to select data from one or more than one tables but still they have some differences. For Example, Union is used to select distinct data from the tables but Union All allows duplicate rows to be selected from the tables.


Suppose we…

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1 comments, 2,278 reads

Posted in Vivek's SQL Notes on 17 November 2009

IDENTITY Property in SQL Server


IDENTITY Property
Sometimes we need a column whose values can uniquely identifying the rows in the table. To achieve this purpose, this column should contains the unique values and it can’t contains the NULL or empty values. We can use this column in the “Where” clause of the Select statement…

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0 comments, 207 reads

Posted in Vivek's SQL Notes on 11 November 2009