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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.

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Remove special character from string in MongoDB

Problem: Suppose wehave a collection and one field is type string contains some special character (like !@#$%) and we don’t want these special character.
Solution: We can easily remove the special character from field using script “replace(/[^a-zA-Z 0-9 ]/g, '')” in our query.  How can we remove special character from string using this script please see following example.
Example: Suppose we have a collection “EduSurvey “where we are collecting information from institutions.

{Name:"JB institute”, About:"This is good one collage for MBA", Information:"This $%%institute ##has good faculty etc$$"}
{Name:"MK institute”, About:"This is good one collage for MCA", Information:"This$$%# is the dummy text12"}
{Name:"MG institute”, About:"This is good one collage for B,Tech", Information:"This# institute@ has&* good infrastructure"}

Did you notice Information fields contains some special character so we…

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 …

Installing PostgreSQL on Windows

Installing PostgreSQL on Windows Follow the following step to install PostgreSQL on windows. Step 1: Download the expected version suitable for you from the link https://www.enterprisedb.com/downloads/postgres-postgresql-downloads#windows Step 2: Double click on the installer file, an installation wizard will appear and guide you through multiple steps where you can choose different options that you would like to have in PostgreSQL. The following illustrates each step and its options for installation. If you install a different version, you may get additional steps. Step 3: In this step of the installation process would be to select the directories for installation location where PostgreSQL would be installed. By default, it is stored under the C:\\ProgramFile. Step 4: Enter the password for the database super-user and service account. Step 5: Enter the port for PostgreSQL. Make sure that no other applications are using this port. Leave it as default if you are unsure. Step 6: Choose the de…