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SELECT * Vs. SELECT COLUMNS – SQL Server Optimization Techniques
“Don’t use * in SELECT query, instead use only required column”. This is one of the tips to optimize SELECT query. However, does this real...
How to get error description in SSIS dataflow?
In SSIS, there is no direct method to get the error description when error occurred during data Load and transformation. We can only redir...
NULL value for empty field when importing flat file in SSIS
When importing data from text file you may need to apply NULL to the field where no values present (blank). Not doing so the package may fai...
Database Modelling – Many to Many Relationship
Let’s start with an example to understand what is many to many relationship and how this can be represented in database. If you have sho...
JOIN – Inner Join and Outer Join
JOIN is one of the fundamental units of relational database system. Generally JOIN is used to combine related data from many tables to pr...
How to insert values into an Identity column in SQL Server
Identity is a property that can be set on a column. When an identity is enabled the column will be populated automatically by system and it...
Concatenate column values from multiple rows into a single column in SQL Server
I have created a simple table to demonstrate how to concatenate the values from multiple rows in to one column. CREATE TABLE #tblProduct...
How to find whether the date is end date of the month in SQL
To know the given date is end date of the month, You can use the dateadd and day functions. that is, you should add 1 day to the given date...
Table variable and Table type in transaction
The myth is to roll back the work done inside the transaction, in case of any error during the transaction. However this is not the case wit...
Usage of @@Error within transaction
@@ERROR returns error number of the last statement executed. When the last executed statement completed successfully, this returns 0. In cas...
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