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SQL SERVER Integration Service (SSIS)

What is BI(Business Intelligence)
Business Intelligence is all about converting large amount of data into useful data thereby we can easily acquire knowledge through BI analysis for the business action. A typical BI environment data-source, business model, data model, ETL, and transformation tools to organize the data into useful information.


Breakpoints in SSIS  
Breakpoint is responsible to stop execution of package when specific event occur in control flow to investigate and troubleshoot  the state of the SSIS package. Read More


Data Viewer in SSIS
Data Viewers are containers that can contain a single SSIS buffer’s work.  As the data passes through the Data Path you are able to view what is in each buffer.  As each buffer passes into the Data Viewer, the processing of the SSIS package on that Data Path is paused.  In essence, you have a breakpoint.  Read More


Variables in SSIS
according to Microsoft, Variables store values that a SQL Server Integration Services package and its containers, tasks, and event handlers can use at run time. The scripts in the Script task and the Script component can also use variables. The precedence constraints that sequence tasks and containers into a workflow can use variables when their constraint definitions include expressions. Read More...


Control Flow in SSIS 
Control flow is the collection of data flow task which is provide structure , functionality in package and connect the executables , container, task into a ordered control flow. SSIS provide three types of control flow  containers ,task, precedence containers. Read More...


Data Flow task and Data flow in SSIS 
Data flow task is the collection of data flow engine or you may say Data Flow task encapsulate data flow engine, Data Flow engine move the data from source to destination, it's give the facility to transforms and to modify data as it is moved. Read More..
 

Sort Transformation in ssis

Sort transformation responsible to arrange data in ascending or descending order and copies the data to the transformation output. Multiple sorts can be apply to an input**. The Sort transformation can also remove duplicate rows which is part of its sort. Read More..


Lookup Transformation in SSIS
Lookup transformation is responsible to join columns to the data flow/data set, by accessing additional information in a related table based on values in common columns.Read More


Merge and Merge join transformation in SSIS
Using Merge Transformation we can combines two sorted data-set into single data-set basically Merge Transformation used to combines rows from two sorted data flows into one sorted data flow based on values in common columns.Read More

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What is difference between UNION and UNION ALL in SQL Server

We use UNION and UNION ALL operator to combine multiple results set into one result set.
UNION operator is used to combining multiple results set into one result set but removes any duplicate rows. Basically, UNION is used to performing a DISTINCT operation across all columns in the result set. UNION operator has the extra overhead of removing duplicate rows and sorting result.
UNION ALL operator use to combine multiple results set into one result set but it does not remove any duplicate result. Actually, this does not remove duplicate rows so it is faster than the UNION operator. If you want to combine multiple results and without duplicate records then use UNION otherwise UNION ALL is better.
Following some rules for using UNION/UNION ALL operator
1.The number of the column should be the same in the query's when you want to combine them. 2.The column should be of the same data type. 3.ORDER BY clause can be applied to the overall result set not within each result set.
4.Column name of …

Add day to ISODate in MongoDB

We can use $add operator to add days in ISODate in mongodb, $add is the Arithmetic Aggregation Operator which adds number and date in mongodb.
Syntax:

{ $add: [ <expression1>, <expression2>, ... ] }

Note:  If one of the argument is date $add operator treats to other arguments as milliseconds to add to the date.
Example: Suppose we have a Test collection as below.

{"Title" : "Add day to ISODate in MongoBD","CreatedDate" : ISODate("2016-07-07T08:00:00.000Z")}

Query to add 2 days in CreatedDate

db.Test.aggregate([      { $project: { Title: 1, AddedDate: { $add: [ "$CreatedDate", 2*24*60*60000 ] } } }    ])

Result:

{ "_id" : ObjectId("579a1567ac1b3f3732483de0"), "Title" : "Add day to ISODate in MongoBD", "AddedDate" : ISODate("2016-07-09T08:00:00.000Z") }

Note: As mentioned in above note we have to convert days in millisecond because $add operator treat to other arg…

Merge and Merge join transformation in SSIS

MERGE TRANSFORMATION
Using Merge Transformation we can combine two sorted data-set into single data-set basically Merge Transformation used to combines rows from two sorted data flows into one sorted data flow. Following tasks you may perform using Merge Transformation: 1.Suppose we have a scenario like, we need to merge data from a database table and excel means we want to merge data from two different data sources. For such type of scenario, you can use Merge Transformation. 2.If we want to merge data from two same structured tables but exists two different servers. 3.Sometimes we get an error due to data in a row, after correcting errors in the data we can re-merge rows easily. See below explanations may help you to understand Merge Transformation: I do evaluate here, you already know about the data source, data conversion, data flow, task flow, control flow etc. Note:Before Merge transformation, we need to sort the data using Sort Transformation. After sorting data add data path to Merge…