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Each table can have only one clustered index. NonClustered Index. NonClustered Index does not alter the physical order of the table and maintains logical order of data. Each table can have nonclustered indexes. What is a Cursor? A database Cursor is a control which enables traversal over the rows or records in the table.
This can be viewed as a pointer to one row in a set of rows. Cursor is very much useful for traversing such as retrieval, addition and removal of database records. What is a relationship and what are they? Database Relationship is defined as the connection between the tables in a database.
There are various data basing relationships, and they are as follows:. One to One Relationship.
One to Many Relationship. Many to One Relationship. Self-Referencing Relationship. What is a query? A DB query is a code written in order to get the information back from the database. Query can be designed in such a way that it matched with our expectation of the result set.
Simply, a question to the Database. What is subquery? A subquery is a query within another query. The outer query is called as main query, and inner query is called subquery. SubQuery is always executed first, and the result of subquery is passed on to the main query.
What are the types of subquery? There are two types of subquery — Correlated and Non-Correlated. A correlated subquery cannot be considered as independent query, but it can refer the column in a table listed in the FROM the list of the main query. A Non-Correlated sub query can be considered as independent query and the output of subquery are substituted in the main query. What is a stored procedure? Stored Procedure is a function consists of many SQL statement to access the database system.
Several SQL statements are consolidated into a stored procedure and execute them whenever and wherever required. What is a trigger? A DB trigger is a code or programs that automatically execute with response to some event on a table or view in a database. Mainly, trigger helps to maintain the integrity of the database. When a new student is added to the student database, new records should be created in the related tables like Exam, Score and Attendance tables.
Commit and Rollback can be performed after delete statement. Truncate operation cannot be rolled back.
What are local and global variables and their differences? Local variables are the variables which can be used or exist inside the function.
They are not known to the other functions and those variables cannot be referred or used. Variables can be created whenever that function is called. Global variables are the variables which can be used or exist throughout the program. Same variable declared in global cannot be used in functions. Global variables cannot be created whenever that function is called. What is a constraint?
Constraint can be used to specify the limit on the data type of table. Constraint can be specified while creating or altering the table statement. Sample of constraint are. What is data Integrity? Data Integrity defines the accuracy and consistency of data stored in a database. It can also define integrity constraints to enforce business rules on the data when it is entered into the application or database. What is Auto Increment? Auto increment keyword allows the user to create a unique number to be generated when a new record is inserted into the table.
What is the difference between Cluster and Non-Cluster Index? Clustered index is used for easy retrieval of data from the database by altering the way that the records are stored.
Database sorts out rows by the column which is set to be clustered index. A nonclustered index does not alter the way it was stored but creates a complete separate object within the table. It point back to the original table rows after searching. What is Datawarehouse? Datawarehouse is a central repository of data from multiple sources of information. Those data are consolidated, transformed and made available for the mining and online processing.
Warehouse data have a subset of data called Data Marts. What is Self-Join? Self-join is set to be query used to compare to itself. This is used to compare values in a column with other values in the same column in the same table.
What is Cross-Join? Cross join defines as Cartesian product where number of rows in the first table multiplied by number of rows in the second table.
What is user defined functions? User defined functions are the functions written to use that logic whenever required. It is not necessary to write the same logic several times. Instead, function can be called or executed whenever needed. What are all types of user defined functions? Three types of user defined functions are. Unique Index: Unique Indexes helps maintain data integrity by ensuring that no two rows of data in a table have identical key values.
A unique index can be applied automatically when a primary key is defined. It ensures that the values in the index key columns are unique.
Clustered Index: Clustered Index reorders the physical order of the table and search based on the key values. There will be only one clustered index per table.
Each table can have many non-clustered indexes. What is the difference between Cluster and Non-Cluster Index? The difference between the clustered and non-clustered index in SQL is as follows: Clustered Index: It is used for easy retrieval of data from the database and it is faster. One table can only have one clustered index It alters the way records are stored in a database as it sorts out rows by the column which is set to be clustered index.
Non-Clustered Index: It is slower compared to the Clustered index. What is a View? A view is like a subset of a table which is stored logically in a database. A view is a virtual table.
It contains rows and columns similar to a real table. The fields in the view are fields from one or more real tables. Views do not contain data of their own. They are used to restrict access to the database or to hide data complexity. What are the advantages of Views? Some of the advantages of Views are Views occupy no space Views are used to simply retrieve the results of complicated queries that need to be executed often.
Views are used to restrict access to the database or to hide data complexity. What is a relationship and what are they? Database Relationship is defined as the connection between the tables in a database. All locks acquired by transaction are released.
It undoes all the work done by the user in a transaction. A cursor is implicit by default. The user cannot control or process the information in this cursor.
If a query returns multiple rows of data, the program defines an explicit cursor.
This allows the application to process each row sequentially as the cursor returns it. It occurs when a trigger tries to update a row that it is currently using.
It is fixed by using views or temporary tables, so database selects one and updates the other. If it is used, it must come first in a stand alone file.
A maximum of 12 triggers can be applied to one table. It is much more efficient as each statement is not individually stripped off. A triggering statement or event. A restriction An action 26 What are character functions? Group functions give results based on groups of rows, as opposed to individual rows.
It is True if rows are not fetched. Intersect is the product of two tables and it lists only matching rows. Sequences are used to generate sequence numbers without an overhead of locking.