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Joins are used in SQL to combine rows from two or more tables based on a related column between them.
There are different types of joins: inner join, left join, right join, and full outer join.
Inner join returns only the matching rows from both tables.
Left join returns all the rows from the left table and the matching rows from the right table.
Right join returns all the rows from the right table and the matching rows fr...
DBMS types include relational, NoSQL, object-oriented, and hierarchical. They differ in data structure and storage.
Relational DBMS stores data in tables with predefined relationships between them (e.g. MySQL, Oracle)
NoSQL DBMS stores data in flexible, non-tabular formats (e.g. MongoDB, Cassandra)
Object-oriented DBMS stores data as objects with attributes and methods (e.g. db4o)
Hierarchical DBMS stores data in a tree-li...
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I applied via Company Website and was interviewed in Nov 2024. There were 2 interview rounds.
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I applied via Naukri.com and was interviewed in Oct 2024. There was 1 interview round.
SSIS Architecture is a platform for data integration and workflow applications.
SSIS stands for SQL Server Integration Services
It includes a data flow engine, control flow engine, and event handling
SSIS packages can be created using SQL Server Data Tools (SSDT)
SSIS packages can be scheduled and executed using SQL Server Agent
Transactions in SSIS can be implemented using the TransactionOption property in Control Flow tasks.
Set the TransactionOption property to Required on the Control Flow tasks that need to be included in the transaction.
Use the TransactionOption property to specify the level of transaction support needed for each task.
Transactions can be managed using the Distributed Transaction Coordinator (DTC) service.
I applied via Naukri.com and was interviewed in May 2024. There was 1 interview round.
Use the INSERT INTO statement with multiple value sets separated by commas
Use the INSERT INTO statement followed by the table name
List the column names in parentheses after the table name
Use the VALUES keyword followed by multiple value sets in parentheses, separated by commas
Example: INSERT INTO table_name (column1, column2) VALUES (value1, value2), (value3, value4)
Update query using joins in SQL
Use UPDATE statement with JOIN clause to update data in multiple tables
Specify the tables to be updated and joined using ON clause
Set the columns to be updated in SET clause
I applied via Naukri.com and was interviewed in Apr 2024. There were 3 interview rounds.
Query to display the highest salary in a table
Use the SELECT statement to retrieve data
Use the MAX() function to find the highest salary
Specify the column name for salary in the query
Types of indexes include clustered, non-clustered, unique, composite, and filtered indexes.
Clustered indexes physically reorder the data in the table based on the index key.
Non-clustered indexes create a separate structure for the index, pointing back to the original table data.
Unique indexes ensure that no two rows have the same values in the indexed columns.
Composite indexes are created on multiple columns to improve...
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