Database Question And Answers.pdf
The hierarchical database model uses the hierarchic sequence that always starts at the left side of the tree. Full recordings of two tables is Union All operator. Matching records of first and second query and other rows from the first query will be displayed as a result set. Entity-Relationship model B. But not, in the case of Unique Key.
Difficulty in accessing data C. It is mainly used in expressing relationships within relationships. This indexing does not allow the field to have duplicate values if the column is unique indexed. Column header is refer as A.
Simply, a question to the Database. The attribute that can be divided into other attributes is called A.
What are all the different normalizations? In the narrative description of the database requirements, verbs tend to indicate the names of relationship types.
Which of the following is not Modification of the Database A. Compilation of all entries of any particular type of entry in the database is called Entity Set.
SubQuery is always executed first, and the result of subquery is passed on to the main query. The procedure of boosting the collection of indexes is named as Index hunting. Datawarehouse is a central repository of data from multiple sources of information. Result from student st, Exam as Ex where st. Sort merge join Two independent sources of data are joined in sort merge join.
Storage and access of data from the central location in order to take some strategic decision is called Data Warehousing. It is also process of introducing redundancy into a table by incorporating data from the related tables. Local variables are the variables which can be used or exist inside the function.
The outer query is called as main query, and inner query is called subquery. Every primary-key value must match a primary-key value in an associated table B.
Manipulating data in a database such as inserting, updating, deleting is defined as Data Manipulation Language. Which of the following is not binary operation? Unified Modeling Language C. Your email address will not be published. What are all the different types of indexes?
Splitting of one table which is large into smaller database entities logically is called database partitioning. Mainly, death in the dark continent rules pdf trigger helps to maintain the integrity of the database. Clustered index is used for easy retrieval of data from the database by altering the way that the records are stored.
What are the types of subquery? The object itself comprises bodies of object for its operation which are called methods. This can be used to compare A and, other language characters and also depends on the width of the characters.
What are all types of user defined functions? For every row of outer table, access the rows of inner table. Each table can have only one clustered index. Data Definition Language B. Removing the columns which are not dependent on primary key constraints.
Top 50 Database Interview Questions & Answers- DBMS
In mathematical term Row is referred as A. The protocol that ensures conflict serializability is time stamp ordering protocol. Every primary-key value must match a foreign-key value in an associated table C.
Warehouse data have a subset of data called Data Marts. They performance is better as compared to nested loop when the data volume is big enough but it is not good as hash joins generally. Data Integrity defines the accuracy and consistency of data stored in a database. Which of the following is a component of the relational data model included to specify business rules to maintain the integrity of data when they are manipulated?
Database Interview Questions and Answers
The Primary key must be A. DeNormalization is a technique used to access the data from higher to lower normal forms of database. It's an all or none concept which enables the user to be assured of incomplete transactions to be taken care of. Which of the following is based on Multi Valued Dependency?
Top 50 SQL Interview Questions & Answers
Partial transitive dependency C. Consider the following table obtained using Student and Instructor relations.
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